Powering my GPU

Roane · Feb 13, 2014

Reposting due to someone else marking my thread as solved without my question being answered.

Currently I have a single 8 pin to dual 6+2 pin PSU>PCI-E connected to my GPU, is my GPU getting enough power and/or if my PSU handle my current setup?

GPU- EVGA GTX 780 Ti Classified.
PSU- Corsair AX860i with (CP-8920049) cables.

ModernWarfare · Feb 13, 2014

whats the rest of you're specs also the second slot ram must be at red slot for better performance

Someone Somewhere · Feb 13, 2014

You can unmark the solved. Should be a button marked something like 'unselect solution'. Can't remember the exact wording, but it's gray and in the same place as the 'pick as the solution' button.

I assume that you mean it's an 8-pin modular plug on the PSU to a pair of 6+2-pin plugs, rather than an aftermarket adapter? If so, you're fine.

ModernWarfare · Feb 13, 2014

you're gpu requires 42amps 12volt rail you're psu is 71amps 12volt rail so you should be fine oh btw change second ram slot to both red for better performance

Someone Somewhere · Feb 13, 2014

Oh yeah, missed the RAM. I normally spot it but I guess there's too much bling there. :ouch:

InvalidError · Feb 13, 2014

Try running FurMark for 5 minutes. If the GPU does not mysteriously reset or cause your PC to crash then yes, power is fine.

150W is just over 12A and on the 2x3 connector, that's less than 5A per pin/wire from the PSU so unless the wiring and connectors are junk - 5A per pin/wire is what the ATX spec used to recommend for safety reasons. On the 2x4 150W connector, the extra pins are grounds anyway.

Someone Somewhere · Feb 13, 2014

I looked it up a while ago, and Molex (who make/design those connectors) rate them at 9A/pin.

The PCIe standard is seriously conservative.

bazanella · Feb 13, 2014

I know this is off topic, but I noticed in the picture that maybe your memory isn't working in dual channel, try pluggin both memory sticks in same color slots.

InvalidError · Feb 13, 2014

ModernWarfare :

The GPU does not "require" 42A... it has dual 2x3 connectors and each connector is spec'd for 75W (~6A) max and including the 75W from the motherboard, that's 225W absolute maximum assuming the manufacturer followed the connectors' specifications, which translates to ~19A.

ModernWarfare · Feb 13, 2014

InvalidError :

according to website it needs 42amps oh and btw the gpu's max power is 250watts

Someone Somewhere · Feb 13, 2014

That 42A is the recommended PSU for the whole system, with a big pile of overkill added in just in case you're using a crap PSU or an OCed LGA2011 chip.

The 250W is the GPU's actual max power, and works out to ~21A.

InvalidError · Feb 13, 2014

ModernWarfare :

Then that means two things:
1- the manufacturer is exceeding the connectors' specs
2- 250W is still only 20.7A so the manufacturer is roughly doubling the GPU's rating in their "requirement"

42A is obviously not the GPU's own requirement. Merely the manufacturer's over-inflated wild-ass-guess about how high the 12V rating on the PSU for the WHOLE SYSTEM must be assuming people have junky PSUs.

Someone Somewhere · Feb 13, 2014

There are CPUs out there that draw 150W before OCing. But yeah, the junky PSU side too.

ModernWarfare · Feb 13, 2014

InvalidError :

ModernWarfare :

Then that means two things:
1- the manufacturer is exceeding the connectors' specs
2- 250W is still only 20.7A so the manufacturer is roughly doubling the GPU's rating in their "requirement"

42A is obviously not the GPU's own requirement. Merely the manufacturer's over-inflated wild-ass-guess about how high the 12A rating on the PSU for the WHOLE SYSTEM must be assuming people have junky PSUs.

exactly thanks for correcting me

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