gtx 680 sli bottleneck by power supply?

adam_1343 · Jul 15, 2013

I recently got my 2nd gtx 680 and am now running them in SLI however there are a few issues. As of now, no matter what game or bench that i am running, both cards are only getting about 40-60 percent usage. I am running them no a i7 3770k oc to 4.5ghz with an h100. I first thought it was my cpu giving me issues, however, I am now beginning to think it is my power supply. I have a corsair cx 750. would having an oc to 4.5 along with an h100 as well as 1 ssd and 1 hdd cause a bottleneck? Is my power supply causing the performance of my two 680s to suffer?

Intel God · Jul 15, 2013

You have MORE then enough power with a 750W

This setting changed? Vsync enabled?

adam_1343 · Jul 15, 2013

yes I have already changed it to max performance, vsync is disabled.

adam_1343 · Jul 15, 2013

also, when I increase the refresh rate on my monitor to 120hz the computer "sticks" and freezes whenever I opne programs, ive only managed to get 1 of my monitors to work witht he dual gpu set up, when I add the other the freezing begins.

edit: also single card set up works great. i get 99 percent usage and able to use 120hz on dual monitors.

Intel God · Jul 15, 2013

adam_1343 :

What drivers are you using?

adam_1343 · Jul 15, 2013

320.49

Intel God · Jul 15, 2013

What games are you getting low usage in? What res are you playing at?

adam_1343 · Jul 15, 2013

all games/benches. ive tried all resolutions but i mainly play at 2560x1440

Intel God · Jul 15, 2013

adam_1343 :

Could you run 3dmark11 for me and post the link to the score?

adam_1343 · Jul 15, 2013

yes but it will be a few minutes. I will have to d/l it.

Intel God · Jul 15, 2013

adam_1343 :

Take your time. I'll wait for you

adam_1343 · Jul 15, 2013

http://www.3dmark.com/3dm/925861?

only had the basic thing on steam, hope this will help.

Intel God · Jul 15, 2013

adam_1343 :

Download this one and enable SLI

http://www.3dmark.com/3dmark11/

adam_1343 · Jul 15, 2013

sli was enabled on the last one but was only detecting one card? and i will d/l that one too. is there anything i have to do special to enable sli in that specific program?

Intel God · Jul 15, 2013

adam_1343 :

No. Just enable SLI in the Nvidia control panel

adam_1343 · Jul 15, 2013

also i click the steam download and its the same thing =/ lol

adam_1343 · Jul 15, 2013

it is enabled. if you look at the scores, my 680 scored higher than a titan which is impossible for one 680 alone, its only picking up one card....

JackNaylorPE · Jul 15, 2013

CX is a bit weak IMO for SLI .... Id want at least a TX V2 series, better yet an HX or AX

Download and run OCCT GPU tests (use window mode so ya can peek at Afterburner) with Afterburner running. Make sure AB showing GPU usage for both cards. Check voltage and temps while running (OCCT will graph then) ... 60 minute run is enough.

http://www.ocbase.com/index.php/download
http://www.guru3d.com/files_tags/download_afterburner_beta.html

As for 750 watts, nvidia wants 745 minimum

http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-680/specifications

Maximum Graphics Card Power (W) = 195 W
Minimum System Power Requirement (W) = 550 watts

http://www.guru3d.com/articles_pages/geforce_gtx_680_review,9.html

Here is Guru3D's power supply recommendation:

GeForce GTX 680 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum.

If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina

adam_1343 · Jul 15, 2013

thanks for the input. i ran a few more benches and apparently my cards are actually performing above average even though the gpu usage says its low (maybe a bug?). I scored 1820 on unigine heaven 4.0 which seems to be a pretty normal score for gtx 680s in sli. the usage was worrying me but as long as im getting the performance maybe it is just a bug with reading the gpus.

adam_1343 · Jul 15, 2013

so i just confirmed that my evga precision was bugged. loaded up different gpu usage program and both gpus are working at 95%+ percent. thank you all for your help.

gtx 680 sli bottleneck by power supply?

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