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Need some help with a quick SLI issue

post #1 of 63
Thread Starter 
Hey guys,

So I got two gtx680s now, one is slightly higher clocked than the other.
So I installed the drivers again, have the nv panel show sli activated, got gpuz displaying it too.
But when I go to bench, it crashes.
Both cards run benches fine on their own.

Is there any pointers?
post #2 of 63
Link the clocks on both cards using eVGA Precision or MSI Afterburner. Starting preferably with the clocks of the slower of the two cards.

Also check your power draw. You sig says that you're using a AX750, but I don't know how old it is and how well it's holding up to the power requirements of running two GTX 680 cards.

I'd surmise that a very good 750W power supply is close to the safe limit for running stock GTX 680s in SLi. The fact that you're running at least one factory OC card is going to push the power requirements even further. Especially if you're overclocking your CPU too.
Edited by wevsspot - 3/28/14 at 8:41am
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post #3 of 63
Thread Starter 
Quote:
Originally Posted by wevsspot View Post

Link the clocks on both cards using eVGA Precision or MSI Afterburner. Starting preferably with the clocks of the slower of the two cards.

Also check your power draw. You sig says that you're using a AX750, but I don't know how old it is and how well it's holding up to the power requirements of running two GTX 680 cards.

I'd surmise that a very good 750W power supply is close to the safe limit for running stock GTX 680s in SLi. The fact that you're running at least one factory OC card is going to push the power requirements even further. Especially if you're overclocking your CPU too.

Power should be fine - single GPU + whole system doesn't draw more than 320w:
http://www.overclock.net/t/1475149/how-much-power-does-your-pc-draw-heres-my-results

So 750w is more than enough - I'll monitor usage now.

Here's the GPUZ print screens:
GPU2 (second one I bought) is a faster card:
GPU1:



GPU2:



NV paneL:
post #4 of 63
Pure guess, but I would also say get the clocks at the same speed and go from there. I run my 770's off of a 700w. Granted its not just about total watts.
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post #5 of 63
Are you going to try linking the gpu and memory clock speeds using eVGA Precision or MSI Afterburner?

Based on your link you've got a Watt-Meter so you'll know for sure the power draw and that can be eliminated from the equation.

You've tried each card individually, and you're assured that power isn't an issue based on your testing / comments. So to me it's either gpu driver related or that your rig doesn't like running the non-syncronous gpu / memory speeds.
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post #6 of 63
Thread Starter 
Quote:
Originally Posted by Watagump View Post

Pure guess, but I would also say get the clocks at the same speed and go from there. I run my 770's off of a 700w. Granted its not just about total watts.

Quote:
Originally Posted by wevsspot View Post

Are you going to try linking the gpu and memory clock speeds using eVGA Precision or MSI Afterburner?

Based on your link you've got a Watt-Meter so you'll know for sure the power draw and that can be eliminated from the equation.

You've tried each card individually, and you're assured that power isn't an issue based on your testing / comments. So to me it's either gpu driver related or that your rig doesn't like running the non-syncronous gpu / memory speeds.

Yeah very odd - just launched some BF4 singleplayer - ran fine for 10mins:




Pretty much everything on ultra.
I haven't linked the GPU speeds via AB - but I'll do that right now.

Actually seems to be already ticked - "synchronise GPU settings"
post #7 of 63
This isn't a PowerSupply issue.

A TX750 would have no problem powering two 680's. And if it was more of a Powersupply problem it would most likely end with his PC restarting not games crashing on load. Though there is a slim chance that it could be the Powersupply, but not likely.


OP I would test the new card by itself. Always best to test a new card by itself anyways.

Next I would remove any sign of nvidia drivers from your rig and update.

Also revert your Overclock back to stock if you have one set.
Edited by DzillaXx - 3/28/14 at 9:13am
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post #8 of 63
Thread Starter 
Right so I ran Valley in SLI - beasted it through....!

Here are some benches:
KFA2 heaven + valley (single GPU setup):




MSI heaven + valley (single GPU setup):



SLI Valley:



Wattage - 450w - let's say 500w for argument sake - picture taken whilst running valley for 1min in SLI:
BOTH GPUS are STOCK - CPU is OC'ed to 4.5ghz:




Pics of my SLI setup:






post #9 of 63
Thread Starter 
OK....so now SLI'ed heaven passes too?
However there was NOTICEABLE STUTTERING - any ideas? Is it the bridge?

post #10 of 63
I run a pretty similar setup. 3770k + 2 x SLI 670's, different cards (one Zotac, one EVGA). Overclocking with PrecisionX. A few tips:

1. Not sure about Afterburner, but with PrecisionX when you link the card settings it makes them have the same offset. Not the same clock. So it's not very useful to link settings with cards that have different factory default clocks.

2. For SLI, your performance depends on the speed of the slower card (including overclocks). That means there is no point in having one card running faster than the other. You should see what clock your cards boost to at default settings and set your overclocks to compensate. For example, let's say card 1 boosts to 1150 MHZ and card 2 boosts to 1200 MHz. Then you should use +50 more overclock on card 1 so they boost to the same speed.

3. Running cards in SLI adds a bit of extra stress, so it's possible you need to back off on the overclocks a little compared to the single-card stable overclocks. Looks like you have non-reference coolers as well so one card will be blowing hot air into the other when running SLI.

4. Just running a single Heaven/Valley bench doesn't necessarily mean your overclock is stable. When you're on the edge it might bench fine but crash if you let Heaven loop for 30 minutes. Or crash in BF4.
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