Nvidia GTX 680 SC Power Requirements


I have decided to upgrade my graphics card to a EVGA SC Nvidia 680 GTX, however I realise due to the OC that the power specs are different and the Nvidia spec sheets says it needs a 550 watt power supply with a 38 amp on the +12 volt rail. ( this was for a system fitted with an i7 intel 3.2 GHz processor.


I bought my PC from PC Specialist and I understand that the system is fitted with a power supply that has the following

Manufacturer - FSP
Model - FSP800-80GLN(85)

DC Output
+3.3v 30A+5v 30A
+12V1 20A
+12V2 20A
+12V3 20A
+12V4 20A
+5Vsb 3.0A
-12V 1A
Total Continuous output 800W

1x 24pin ATX (20+4)
1x 8pin CPU 12v (2x4)
2x 6pin PCIe
2x 8pin PCIe (6+2)
2xSATA (1x3, 1x2)
2xMolex (2x2+2floppy)

Am I correct and reading that the +12v rail only has 20 amp and will I also need to upgrade my power supply too?

I took it for granted as this power supply runs my current rig and my son's who has a Radeon HD 5970, I assume this would require more power.

Can anyone confirm for me please?

Many thanks
2 answers Last reply
More about nvidia power requirements
  1. they dont give you an indication of which rails those pcie connectors are on?
  2. 800W is enough for EVGA 680 SC but I would suggest getting a new power supply like Corsair AX850
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