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Power Sli

OKIA 600Watt ATX 12V V22 SLi CrossFire Ready Active PFC PC Power Supply PSU NEW
OKIA 600Watt ATX 12V V22 SLi CrossFire Ready Active PFC PC Power Supply PSU NEW $50.00
Time Remaining: 50m
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Quiet 850 Watt Intel AMD PC ATX Power Supply SLI PCI E i5 i7 FX X6 X2 X3 X4
Quiet 850 Watt Intel AMD PC ATX Power Supply SLI PCI E i5 i7 FX X6 X2 X3 X4 $43.99 (1 Bid)
Time Remaining: 4h 20m

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New HIGH POWER SLI Certified ATX 3 Rail 12V Intel Dual Xeon Server EPS Supply
New HIGH POWER SLI Certified ATX 3 Rail 12V Intel Dual Xeon Server EPS Supply $69.99
Time Remaining: 5h 26m
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RARE 55 Drive Bay VGA POWER SUPPLY 450 watt THERMALTAKE SLI CROSSFIRE READY
RARE 55 Drive Bay VGA POWER SUPPLY 450 watt THERMALTAKE SLI CROSSFIRE READY $85.00
Time Remaining: 5h 38m
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HIGH POWER 620W low noise 20dB SLI Certified Computer Supply Industrial PC ATX
HIGH POWER 620W low noise 20dB SLI Certified Computer Supply Industrial PC ATX $69.99
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New HIGH POWER Patented nVidia SLI ATX Intel Dual Xeon Server EPS 12V Supply PSU
New HIGH POWER Patented nVidia SLI ATX Intel Dual Xeon Server EPS 12V Supply PSU $69.99
Time Remaining: 8h 59m
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DC POWER JACK CABLE HARNES TOSHIBA X205 SLi5 X205 SLi6
DC POWER JACK CABLE HARNES TOSHIBA X205 SLi5 X205 SLi6 $8.50
Time Remaining: 9h 7m
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DC POWER JACK CABLE HARNESS TOSHIBA X205 SLi1 OEM NEW
DC POWER JACK CABLE HARNESS TOSHIBA X205 SLi1 OEM NEW $8.50
Time Remaining: 9h 43m
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New Ultra Quiet HIGH POWER low heat 620W i5 i7 SLI PCIe Active PFC PC UL Supply
New Ultra Quiet HIGH POWER low heat 620W i5 i7 SLI PCIe Active PFC PC UL Supply $69.99
Time Remaining: 11h 54m
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DC POWER JACK CABLE HARNES TOSHIBA X205 SLi2 X205 SLi4
DC POWER JACK CABLE HARNES TOSHIBA X205 SLi2 X205 SLi4 $8.50
Time Remaining: 14h 8m
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900W ATX Power Supply 14CM Fan PCI E SLI SATA 20 24 PIN
900W ATX Power Supply 14CM Fan PCI E SLI SATA 20 24 PIN $54.99
Time Remaining: 1d 7h 54m
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950W ATX Power Supply 14CM Fan PCI E SLI SATA 20 24 PIN
950W ATX Power Supply 14CM Fan PCI E SLI SATA 20 24 PIN $55.99
Time Remaining: 1d 7h 54m
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New Quiet 575 Watt Intel AMD PC ATX Power Supply SLI PCI E
New Quiet 575 Watt Intel AMD PC ATX Power Supply SLI PCI E $31.05
Time Remaining: 1d 9h 3m
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New 1200W Gaming PC Silent 140mm Fan ATX 12V Quad nVidia SLI PCIe Power Supply
New 1200W Gaming PC Silent 140mm Fan ATX 12V Quad nVidia SLI PCIe Power Supply $69.99
Time Remaining: 1d 17h 54m
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NEW 1200W SHARK TECHNOLOGY Gaming Computer ATX Silent Power Supply SATA PCIe SLI
NEW 1200W SHARK TECHNOLOGY Gaming Computer ATX Silent Power Supply SATA PCIe SLI $69.99
Time Remaining: 1d 17h 54m
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New OCZ OCZ ZS650W ZS 80 Plus 650W SLI CrossFire Power Supply in Retail Box
New OCZ OCZ ZS650W ZS 80 Plus 650W SLI CrossFire Power Supply in Retail Box $74.95
Time Remaining: 1d 18h 47m
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Rosewill Xtreme Series RX750 S B 850W SLI Ready CrossFire Ready Power Supply
Rosewill Xtreme Series RX750 S B 850W SLI Ready CrossFire Ready Power Supply $66.49
Time Remaining: 1d 21h 17m
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Raidmax Power Supply 500w Blue LED fan SLI crossfire 80+ gaming power supply
Raidmax Power Supply 500w Blue LED fan SLI crossfire 80+ gaming power supply $39.99
Time Remaining: 1d 22h 49m
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BFG Tech BFGR800WPSU 800W ATX 12V SLI Crossfire Ready Power Supply
BFG Tech BFGR800WPSU 800W ATX 12V SLI  Crossfire Ready Power Supply $75.99
Time Remaining: 1d 23h 11m
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New HIGH POWER 1200W 80+ ATX EPS 12V Intel i9 Extreme CPU i7 975 SLI PC Supply
New HIGH POWER 1200W 80+ ATX EPS 12V Intel i9 Extreme CPU i7 975 SLI PC Supply $199.00
Time Remaining: 2d 53m
Buy It Now for only: $199.00
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Thermaltake Toughpower Grand 1200W 80PLUS Gold SLI CrossFire Active Power Supply
Thermaltake Toughpower Grand 1200W 80PLUS Gold SLI CrossFire Active Power Supply $179.99
Time Remaining: 2d 1h 16m
Buy It Now for only: $199.99
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Coolmax CUG 950B 950W SLi Crossfire Modular Power Supply
Coolmax CUG 950B 950W SLi Crossfire Modular Power Supply $25.52 (4 Bids)
Time Remaining: 2d 2h 7m

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Cooler Master RS 750 ACAA GX 750W SLI Power Supply 20 or 244 or 8Pin PSU 80+
Cooler Master RS 750 ACAA GX 750W SLI Power Supply 20 or 244 or 8Pin PSU 80+ $126.68
Time Remaining: 2d 2h 26m
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ThermalTake PurePower 600W 600 Watt BLACK CHROME Mesh Computer SLI Power Supply
ThermalTake PurePower 600W 600 Watt BLACK CHROME Mesh Computer SLI Power Supply $25.00
Time Remaining: 2d 3h 16m
Buy It Now for only: $35.00
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680Watt ATX SLI CrossFire Ready Active PFC 12V 22 Desktop Computer Power Supply
680Watt ATX SLI CrossFire Ready Active PFC 12V 22 Desktop Computer Power Supply $65.00
Time Remaining: 2d 5h 41m
Buy It Now for only: $65.00
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Logisys 575W Power Supply ATX SATA PCI Express SLi Dual
Logisys 575W Power Supply ATX SATA PCI Express SLi Dual $21.95
Time Remaining: 2d 6h 23m

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DC JACK POWER HARNESS For Toshiba P200 ST2071 X205 S9810 X205 SLi6 X205 S7483
DC JACK POWER HARNESS For Toshiba P200 ST2071 X205 S9810 X205 SLi6 X205 S7483 $7.49
Time Remaining: 2d 11h 26m
Buy It Now for only: $8.99
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NEW AC ADAPTER FOR TOSHIBA SATELLITE X205 SLi2 X205 SLi3 X205 S7483 Power Supply
NEW AC ADAPTER FOR TOSHIBA SATELLITE X205 SLi2 X205 SLi3 X205 S7483 Power Supply $27.95
Time Remaining: 2d 14h 21m
Buy It Now for only: $27.95
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Viotek 800W Power Supply Sli Crossfire Support 800 Watt
Viotek 800W Power Supply Sli Crossfire Support 800 Watt $55.88
Time Remaining: 2d 22h 21m
Buy It Now for only: $55.88
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Corsair CMPSU 750TX 750 Watt Power Supply 80 Plus SLI Ready iCore7 iCore5 NEW
Corsair CMPSU 750TX 750 Watt Power Supply 80 Plus SLI Ready iCore7 iCore5 NEW $99.00
Time Remaining: 2d 22h 39m
Buy It Now for only: $99.00
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BFG Tech 650W ATX12V V20 EPS 12V SLI Ready CrossFire Ready Power Supply
BFG Tech 650W ATX12V V20 EPS 12V SLI Ready CrossFire Ready Power Supply $4.99
Time Remaining: 3d 2h 8m

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Cooler Master GX Series 650w Computer Power Supply 80+ SLI Ready RS 650 ACAA NEW
Cooler Master GX Series 650w Computer Power Supply 80+ SLI Ready RS 650 ACAA NEW $109.14
Time Remaining: 3d 2h 9m
Buy It Now for only: $109.14
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850W 14CM LED Fan 80+ plus Bronze Modular ATX Power Supply SLI Ready CrossFire
850W 14CM LED Fan 80+ plus Bronze Modular ATX Power Supply SLI Ready CrossFire $99.20
Time Remaining: 3d 5h 11m
Buy It Now for only: $99.20
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Antec True Power Trio TP3 650 650W ATX12V SLI Certified CrossFire Ready Active P
Antec True Power Trio TP3 650 650W ATX12V SLI Certified CrossFire Ready Active P $55.00
Time Remaining: 3d 7h 4m
Buy It Now for only: $55.00
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AZZA DYNAMO ATX 12V 650 Watts SLi CrossFire Power Supply PSAZ 650B14 PSU NEW
AZZA DYNAMO ATX 12V 650 Watts SLi CrossFire Power Supply PSAZ 650B14 PSU NEW $44.95
Time Remaining: 3d 8h 11m
Buy It Now for only: $44.95
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FSP Everest 800w ATX 12v Computer Power Supply SLI Crossfire Ready Modular
FSP Everest 800w ATX 12v Computer Power Supply SLI  Crossfire Ready Modular $49.99
Time Remaining: 3d 13h 27m
Buy It Now for only: $49.99
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Viotek 700W Power Supply Sli Crossfire Support 700 watt
Viotek 700W Power Supply Sli Crossfire Support 700 watt $57.88
Time Remaining: 3d 18h 56m
Buy It Now for only: $57.88
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Enermax ECO80+ 620W SLI ATX Power Supply SLI 80+ New
Enermax ECO80+ 620W SLI ATX Power Supply SLI 80+ New $105.25
Time Remaining: 3d 19h 52m
Buy It Now for only: $105.25
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Enermax REVOLUTION85+ 950W SLI ATX Modular Power Supply
Enermax REVOLUTION85+ 950W SLI ATX Modular Power Supply $217.33
Time Remaining: 3d 19h 52m
Buy It Now for only: $217.33
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ANTEC SG 850 SIGNATURE 850W POWER SUPPLY 80 PLUS NVIDIA SLI CERTIFIED
ANTEC SG 850 SIGNATURE 850W POWER SUPPLY 80 PLUS  NVIDIA SLI CERTIFIED $244.74
Time Remaining: 3d 21h 38m
Buy It Now for only: $244.74
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NEW 480W Nickel Coating Intel AMD PC ATX Power Supply SLI PCI E
NEW 480W Nickel Coating Intel AMD PC ATX Power Supply SLI PCI E $59.89
Time Remaining: 3d 21h 57m
Buy It Now for only: $59.89
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COOLER MASTER RSA00 AMBAJ3 US 1000W ATX SLI V23 POWER SUPPLY PSU 80 +BRONZE
COOLER MASTER RSA00 AMBAJ3 US 1000W ATX SLI V23 POWER SUPPLY PSU 80 +BRONZE $198.00
Time Remaining: 4d 2h 1m
Buy It Now for only: $198.00
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Quiet 950 Watt Intel AMD PC ATX Power Supply SLI PCI E
Quiet 950 Watt Intel AMD PC ATX Power Supply SLI PCI E $55.99
Time Remaining: 4d 3h 20m
Buy It Now for only: $55.99
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OCZ Evostream 720 watt power supply modular looks great SLI crossfire ready
OCZ Evostream 720 watt power supply modular looks great SLI crossfire ready $10.50 (3 Bids)
Time Remaining: 4d 4h 41m

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Quiet 1050 Watt Intel AMD PC ATX Power Supply Quad SLI
Quiet 1050 Watt Intel AMD PC ATX Power Supply Quad SLI $69.99
Time Remaining: 4d 5h 18m
Buy It Now for only: $69.99
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1050W ATX Power Supply 14CM Fan Quad SLI SATA 20 24 PIN
1050W ATX Power Supply 14CM Fan Quad SLI SATA 20 24 PIN $69.99
Time Remaining: 4d 5h 18m
Buy It Now for only: $69.99
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Quiet 1000 Watt Intel AMD PC ATX Power Supply Quad SLI
Quiet 1000 Watt Intel AMD PC ATX Power Supply Quad SLI $68.99
Time Remaining: 4d 5h 19m
Buy It Now for only: $68.99
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1000W ATX Power Supply 14CM Fan Quad SLI SATA 20 24 PIN
1000W ATX Power Supply 14CM Fan Quad SLI SATA 20 24 PIN $68.99
Time Remaining: 4d 5h 19m
Buy It Now for only: $68.99
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975W Power Supply Modular 140mm Fan 20 24 SATA Dual SLI
975W Power Supply Modular 140mm Fan 20 24 SATA Dual SLI $69.98
Time Remaining: 4d 7h 52m
Buy It Now for only: $69.98
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Quiet 975 Watt Modular ATX Power Supply SATA SLI PCI E
Quiet 975 Watt Modular ATX Power Supply SATA SLI PCI E $69.98
Time Remaining: 4d 7h 52m
Buy It Now for only: $69.98
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KenTek 975W Modular ATX Power Supply SATA SLI 14CM Fan
KenTek 975W Modular ATX Power Supply SATA SLI 14CM Fan $69.98
Time Remaining: 4d 7h 52m
Buy It Now for only: $69.98
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875W Power Supply Modular 120mm Quiet Fan 2024 SATA SLI
875W Power Supply Modular 120mm Quiet Fan 2024 SATA SLI $59.98
Time Remaining: 4d 7h 52m
Buy It Now for only: $59.98
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Quiet 875 Watt Modular ATX Power Supply SATA SLI PCI E
Quiet 875 Watt Modular ATX Power Supply SATA SLI PCI E $59.98
Time Remaining: 4d 7h 53m
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KenTek 875W Modular ATX Power Supply SATA SLI 12CM Fan
KenTek 875W Modular ATX Power Supply SATA SLI 12CM Fan $59.98
Time Remaining: 4d 7h 53m
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775W Power Supply Modular 120mm Quiet Fan 2024 SATA SLI
775W Power Supply Modular 120mm Quiet Fan 2024 SATA SLI $52.98
Time Remaining: 4d 7h 53m
Buy It Now for only: $52.98
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KenTek 775W Modular ATX Power Supply SATA SLI 12CM Fan
KenTek 775W Modular ATX Power Supply SATA SLI 12CM Fan $52.98
Time Remaining: 4d 7h 53m
Buy It Now for only: $52.98
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Quiet 775 Watt Modular ATX Power Supply SATA SLI PCI E
Quiet 775 Watt Modular ATX Power Supply SATA SLI PCI E $52.98
Time Remaining: 4d 7h 53m
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Quiet 850 Watt Intel AMD PC ATX Power Supply SLI PCI E
Quiet 850 Watt Intel AMD PC ATX Power Supply SLI PCI E $34.99
Time Remaining: 4d 9h 34m

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OCZ Technology OCZ700SXS2 700 watt power supply sli ready 80+ certified 12+4 pin
OCZ Technology OCZ700SXS2 700 watt power supply sli ready 80+ certified 12+4 pin $49.99
Time Remaining: 4d 15h 28m
Buy It Now for only: $55.99
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APEVIA JAVA ATX JV650W 650W ATX12V EPS12V SLI Ready CrossFire Ready Power Supp
APEVIA JAVA ATX JV650W 650W ATX12V EPS12V SLI Ready CrossFire Ready Power Supp $19.99 (1 Bid)
Time Remaining: 4d 18h 43m

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Antec SmartPower 20 SP 500 500W ATX12V SLI Ready Modular Power Supply
Antec SmartPower 20 SP 500 500W ATX12V SLI Ready Modular Power Supply $29.99
Time Remaining: 4d 22h 50m

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HIGH POWER 620W nVidia SLI Listed Supply Quad Core 2 i7 UL Approved ATX PC PSU
HIGH POWER 620W nVidia SLI Listed Supply Quad Core 2 i7 UL Approved ATX PC PSU $69.99
Time Remaining: 5d 8m
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New HIGH POWER nVidia SLI Approved Supply for Intel Core 2 Duo Quad Extreme PC
New HIGH POWER nVidia SLI Approved Supply for Intel Core 2 Duo Quad Extreme PC $69.99
Time Remaining: 5d 11m
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CORSAIR HX Series 520W CMPSU 520H ATX12V Modular Power Supply PSU SLI Cert
CORSAIR HX Series 520W CMPSU 520H ATX12V Modular Power Supply PSU SLI Cert $20.50 (3 Bids)
Time Remaining: 5d 50m

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NEW UL nVidia SLI Certified Power Supply for PC ATX LGA 771 Server Board LED PSU
NEW UL nVidia SLI Certified Power Supply for PC ATX LGA 771 Server Board LED PSU $69.99
Time Remaining: 5d 1h 5m
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Thermaltake TR2 500W ATX12V EPS12V PC Power Supply ATI CrossFire NVIDIA SLI
Thermaltake TR2 500W ATX12V  EPS12V PC Power Supply ATI CrossFire NVIDIA SLI $81.85
Time Remaining: 5d 2h 33m
Buy It Now for only: $81.85
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Seasonic SS 650AM 650W 80 Plus Bronze SLI EPS12V ATX12V M12II 650 Power Supply
Seasonic SS 650AM 650W 80 Plus Bronze SLI EPS12V ATX12V M12II 650 Power Supply $146.00
Time Remaining: 5d 4h 28m
Buy It Now for only: $146.00
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10PC 680 Watt 20 4Pin ATX SLI PSU Power Supply SATA PCI
10PC 680 Watt 20 4Pin ATX SLI PSU Power Supply SATA PCI $249.99
Time Remaining: 5d 5h 18m
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NEW Shark 1000W Gaming PC ATX Power Supply Not Noisy 120mm Fan SLI PCIe SATA PSU
NEW Shark 1000W Gaming PC ATX Power Supply Not Noisy 120mm Fan SLI PCIe SATA PSU $54.98
Time Remaining: 5d 7h 17m
Buy It Now for only: $54.98
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SPI FSP550PLGR SLI 550W EPS12V w UL CSA CE FC Approved Computer Power Supply
SPI FSP550PLGR SLI 550W EPS12V w UL CSA CE FC Approved Computer Power Supply $91.83
Time Remaining: 5d 8h 4m
Buy It Now for only: $91.83
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NEW 650 Watt 20 4 pin ATX SLI PSU Power Supply SATA PCI
NEW 650 Watt 20 4 pin ATX SLI PSU Power Supply SATA PCI $24.68
Time Remaining: 5d 8h 27m
Buy It Now for only: $24.68
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Quiet 850 Watt Intel AMD PC ATX Power Supply SLI PCI E Large Single fan Cooling
Quiet 850 Watt Intel AMD PC ATX Power Supply SLI PCI E Large Single fan Cooling $44.99
Time Remaining: 5d 8h 47m

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Quiet 950 Watt Intel AMD PC ATX Power Supply SLI PCI E I5 I7 950W
Quiet 950 Watt Intel AMD PC ATX Power Supply SLI PCI E I5 I7 950W $54.99
Time Remaining: 5d 9h 26m

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Quiet 1050 Watt Intel I5 I7 AMD FX X4 PC ATX Power Supply Quad SLI SATA PCI E
Quiet 1050 Watt Intel I5 I7 AMD FX X4 PC ATX Power Supply Quad SLI SATA PCI E $65.99
Time Remaining: 5d 10h 41m

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COOLER MASTER GX SERIES RS650 ACAAE3 US 650W ATX 12V SLI POWER RS650ACAAE3US
COOLER MASTER GX SERIES RS650 ACAAE3 US 650W ATX 12V SLI POWER RS650ACAAE3US $115.54
Time Remaining: 6d 1h 37m
Buy It Now for only: $115.54
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Silencer 750W EPS12V Quad Black SLI ready 80 plus PC Power Supply by OCZ
Silencer 750W EPS12V Quad Black SLI ready 80 plus PC Power Supply by OCZ $79.99
Time Remaining: 6d 8h 7m
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OCZ 520 Adj Power Supply SLI
OCZ 520 Adj Power Supply SLI $25.00
Time Remaining: 6d 9h 16m
Buy It Now for only: $50.00
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FSP Group Blue Storm II 500W ATX 22 SLI Ready Active PFC Power Supply
FSP Group Blue Storm II 500W ATX 22 SLI Ready Active PFC Power Supply $37.99
Time Remaining: 6d 9h 20m
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Thortech Thunderbolt 1000W TTBK00G 80 PLUS GOLD Certified SLI Ready Power Supply
Thortech Thunderbolt 1000W TTBK00G 80 PLUS GOLD Certified SLI Ready Power Supply $161.49
Time Remaining: 6d 9h 36m
Buy It Now for only: $161.49
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PC Power Cooling Silencer 750 Quad 750W Power Supply SLI Crossfire Certified
PC Power  Cooling Silencer 750 Quad 750W Power Supply SLI  Crossfire Certified $85.49
Time Remaining: 6d 11h 36m
Buy It Now for only: $85.49
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Mushkin 650W ATX SLI CrossFire Certified Power Supply
Mushkin 650W ATX SLI  CrossFire Certified Power Supply $129.95
Time Remaining: 6d 17h 51m
Buy It Now for only: $129.95
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COOLER MASTER RS850 AMBAJ3 US 850W ATX SLI V23 POWER SUPPLY PSU 80 + BRONZE
COOLER MASTER RS850 AMBAJ3 US 850W ATX SLI V23 POWER SUPPLY PSU 80 + BRONZE $159.75
Time Remaining: 6d 19h 35m
Buy It Now for only: $159.75
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New SLI CERTIFIED ATX Power Supply Patented Watt Meter
New SLI CERTIFIED ATX Power Supply Patented Watt Meter $69.99
Time Remaining: 7d 1h 58m
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Thermaltake Purepower W0129RU 600 W ATX12V SLI Ready Active PFC Power Supply
Thermaltake Purepower W0129RU 600 W ATX12V SLI Ready Active PFC Power Supply $39.99
Time Remaining: 7d 6h 1m
Buy It Now for only: $39.99
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Kingwin ABT 750MM ATX 12V V22 BTX SLI Ready CrossFire Ready 750W Power Supply
Kingwin ABT 750MM ATX 12V V22 BTX SLI Ready CrossFire Ready 750W Power Supply $71.00
Time Remaining: 7d 7h 2m
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Kingwin ABT 650MM ATX 12V V22 BTX SLI Ready CrossFire Ready 650W Power Supply
Kingwin ABT 650MM ATX 12V V22 BTX SLI Ready CrossFire Ready 650W Power Supply $59.88
Time Remaining: 7d 7h 2m
Buy It Now for only: $59.88
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New SLI Certified HIGH POWER Xeon Server EPS12V Supply
New SLI Certified HIGH POWER Xeon Server EPS12V Supply $69.99
Time Remaining: 7d 7h 4m
Buy It Now for only: $69.99
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New HIGH POWER SLI Certified Supply Xeon Server EPS12V
New HIGH POWER SLI Certified Supply Xeon Server EPS12V $69.99
Time Remaining: 7d 9h 53m
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750W Thermaltake TR2 RX Power Supply 2x PCIE 6pin 2x PCIE 6+2pin SLI CrossFx
750W Thermaltake TR2 RX Power Supply 2x PCIE 6pin  2x PCIE 6+2pin SLI CrossFx $111.99
Time Remaining: 7d 13h 5m
Buy It Now for only: $111.99
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HIGH POWER nVidia SLI Certified PATENT ATX12V PC supply
HIGH POWER nVidia SLI Certified PATENT ATX12V PC supply $69.99
Time Remaining: 7d 22h 35m
Buy It Now for only: $69.99
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Can my power supply handle SLI?

I'm currently running a Sparkle 9600 GT 2gb, I have a 600Watts SLI ready power supply, I wanted to add a second 9600 GT 2gb, the minimum required power supply for the card is 400 Watts, is my power supply capable of handling a second card?

try it it may... ; = ]...

Psu Technical Guide

The PC playground is full of components, all vying for the title of the most important part of your rig. Everybody has a different opinion; for some it's the processor, all that maths squeezed into a tiny bit of silicon; for others it's the graphics card, boards designed specifically to throw pixels about your panel like plates at a Greek wedding. But where would either of those supermodels of the component world be without a compatible motherboard backing them up? Nowhere. And that's where your PC will end up without a decent power supply keeping the whole lot juiced to the gunnels.

If you make a really bad choice of PSU, your entire rig may end up a smoldering heap at the e-waste recycling point of your local Pikitup. Cascade effects from faulty, or even from just under-powering supplies, can have unpleasant repercussions on the rest of the components making their home in your PC.

Repercussions such as turning your precious $1 000 pixel-pusher into so much molten slag...

Choosing the PSU is then an important part of the PC-building experience, so in this article we'll make that choice a bit easier for you. Will you need a monolithic supply to keep that multi-GPU, desktop giant in check? Or can you make do with something a little more conservative?

Performance Power

At the top-end of the power-hungry PC spectrum are the gaming behemoths that AMD and NVIDIA have created through their quest for multi-GPU goodness. While CPU manufacturers have recently changed tack from simply upping clockspeeds to taking into account the power consumption of their respective processors, the graphics arena has doggedly stuck to the quest for speed. As such, power draw for the latest CPUs has stayed constant over the last few generations compared to their thirstier GPU brethren.

In the graphics market, the sky's the limit power-wise - the latest 9800GX2 from NVIDIA alone runs at nearly 200W. According to some sources the GTX280 just around the corner could well be around 40W higher. Stick two of those babies in SLI and not only will you be light in the wallet, but you're going to be taxing the hell out of any PSU you plug these graphics monsters into. And who could forget about the prancing triple-SLI show-pony? With three 8800 Ultra graphic cards sitting in a row that's 525W sucked into the GPUs alone.

AMD's offerings are a little more forgiving, simply by virtue of being less high-end components. CrossFire X with a host of 3850s in unison can be run quite happily on a 625W PSU. If you're after the fastest 3D-gaming around though, you should spare a thought for the power draw of the incredibly thirsty top end cards.

Extra Draw

When choosing your PSU it's also vital to take into account the possible power draw from the rest of your performance components. Your CPU is going to take anything between 35W and 130W, while the motherboard can drain up to 50W itself. A couple of sticks of DDR2 will run you around 15W, and your drives (optical and hard drive) hit about 30W each. It soon adds up, especially when you add 5-10W for each PCI card and 5W per USB device.

Just hitting the mark though isn't good enough. If you think your 450W PSU can cope with the 400-odd Watts that you've calculated, then think again. Your setup will thirst for more at some stage and running out of power to the inner workings of your gaming rig doesn't just mean it won't boot, it might mean it won't ever boot again. Your PC may struggle on with just enough juice for a while, but any fluctuations in the output of the PSU could seriously affect the delicate sensibilities of your machine. If your rig's only receiving the bare minimum power then eventually something's going to give.

PSU Puzzle

Aside from load, there are other differentiating factors between PSUs; the most obvious being the choice between conventional and modular cabling. The modular PSU came about as a response to the new plugs that performance PCs needed, such as SATA and PCI-E power. While conventionally cabled designs now end up resembling Cthulhu with the amount of wires protruding from their maws, modular supplies provide the option of having the bare minimum of wires necessary to power your rig. The upshot of this is that the insides of your case can be far clearer, improving the airflow over key components such as the graphics card, motherboard, CPU and RAM.

The downside is that modular cables can suffer from increased electrical resistance, causing voltage losses. This can have something to do with the quality of the cable itself and how many times it has been plugged into the socket, but the voltage you lose with the modular design is still fairly insignificant. Another thing to look for in choosing which PSU is right for you is the rail count. Originally, all PC power supplies had only a single 12V rail delivering the necessary voltage but, due to the increased 12V demand brought on by more powerful processors and graphics cards, supplies with more than one 12V rail have been introduced. Spreading the power draw evenly over multiple rails for the more thirsty components provides stability to the platform as a whole, limiting the chances of overloading a particular part of the PSU.

For safety's sake a multiple rail PSU is preferable if you're going to be drawing significant amounts of electricity through it; a multiple-CPU set-up being the perfect example.

Efficiency or Ecology?

Despite these differentiating factors, many people will still look at a new PSU in terms of wattage capabilities alone. In these more ecologically aware times of ours, however, the wattage rating is not the final word on power-brick selection. Efficiency has become a buzzword and is a key battle-ground both in terms of competitiveness and keeping new PCs as ‘green’ as possible.

It isn't possible to achieve a 100% efficiency rating. Due to the nature of the beast, some loses are inevitable. Most current units, especially those from larger manufacturers, will adhere to the 80+ standard, whether they're fully logo'd up or not.

It's also worth noting how economical a PSU is when there's little draw on the unit. If you're leaving a machine on overnight, for whatever reason then even a powerful gaming machine with a high wattage PSU needs to be efficient while it's slowly ticking over.

Efficiency isn't just important from an energy/money/planet saving perspective either, as most of the wasted energy from a PSU manifests itself as heat. If the supply is no good at dissipating this wasted heat then this will lead to a temperature rise within your PC; and we all know that hotter components ain't happier components.

So, the more efficient your PSU, the less cooling you'll need in your PC, the less money you'll have to spend on your energy bills and the fewer polar bears will find themselves confusingly washed up in the Outer Hebrides.

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Written by admin

June 19th, 2008 at 6:46 pm