Is my power supply bottle necking me

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Drunkenfrog

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May 17, 2014
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Hi,

I recently moved in to the realm of SLI as I managed to get hold of another 970 for a decent price. Did some looking around at benchmarks an figured rather than upgrade this year i was hoping 2 Evga SC 970's would see me through.

Install went well but now i am finding when booting in to games such as BF1, COH2, Civ6 etc my games are taking a lot longer to load, an my FPS increase isn't actually that great. Iv checked an SLI it is drawing from both cards rather than just the one, I know some games support SLI more than others.

But i was wondering if my PSU is letting me down? as its nothing special.

Current build:

  • Crosshair V Formula
    AMD FX 8350
    2 x 8gb 2400mhz Vengence
    2 x EVGA SC GTX 970's
    An old Corsair H50 cooler (was going to replace this next)
    1 x 250gb SSD
    2 x 160gb SSD
    1 x 1TB HDD's
    Corsiar CX750M
    1x 2tb External HDD
  • Phanteks Enthoo Luxe (6x140mm & 2x120mm fans)
    NZXT Hue+ with 3 LED strips
If i was going to replace my PSU i was thinking of getting a EVGA SuperNova P2 850W Platinum one.

Any idea of what else it might be if its not my PSU that would be great,

Thanks for the help in advance
 
Solution
Sakkura
A GTX 970 uses about 170W at full load, and the FX-8350 just shy of 150W. The rest of the system won't draw much, let's say 50W to be on the safe side. That puts you at less than 550W power consumption even in the rare case of both GPUs and the CPU being at full load simultaneously (which rarely happens in practice).

I think it's just your CPU holding things back, along with poor SLI optimization in many cases. Long loading times is a bit odd though.
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Sakkura

Sakkura

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Aug 22, 2011
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A GTX 970 uses about 170W at full load, and the FX-8350 just shy of 150W. The rest of the system won't draw much, let's say 50W to be on the safe side. That puts you at less than 550W power consumption even in the rare case of both GPUs and the CPU being at full load simultaneously (which rarely happens in practice).

I think it's just your CPU holding things back, along with poor SLI optimization in many cases. Long loading times is a bit odd though.
 
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Solution
Rogue Leader

Rogue Leader

It's a trap!
Moderator
Dec 22, 2014
32,727
2,807
113,640
Power supplies do not bottleneck.

If it didn't provide enough power or was of poor quality it would fail/crash on you.

Depending on when you got that CX750M (if its the black and gray label its the good one) it may be not the best quality, but if your system isn't crashing you are fine.

Your issues lie elsewhere. For example a CPU that can't keep up with a pair of GTX 970 in SLI.
 
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Drunkenfrog

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May 17, 2014
10
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4,510
thanks for the quick clarification!
Interesting... good to know an rule it out though. systems not crashing if i try to tab out of a game now it takes it sweet time on full screen rather than windowed which is new.

Iv been thinking about doing a full wipe an a clean install i might give that a go an see if it clears the longer loading times as it might be something else. if not il give the CPU a small OC an see if that improves anything.
 
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