Can I SLI gtx680s with a Corsair 850w V2 PSU?

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So as some of you might already know, bf4 beta came out and the requirements for this game is pretty tough. I thought I'll easily handle it with just one gtx680 2gb and an i7 3770k. Turns out the game keeps bouncing back and forth between 30-70fps..very unstable. I understand that this is still the beta, but I should still at least get a minimum of 50 fps and not 30. I already own a 2nd gtx 680 and i decided to SLI both of them the other day even though I wasn't sure that my Corsair 850w can handle it. When I installed my 2nd gpu and booted up the pc, the computer restarted by itself before it even booted (I thought maybe it did that because I installed new hardware) then when windows booted, I ran a benchmark and I could see the benchmark itself but the screen kept flashing green colours. I decided to change the SLI bridge and after that everything worked fine. But after a few hours, I panicked and decided to remove the 2nd gtx 680 anyway and go back to a single 680 because of all the weird stuff that happened . Now I'm here to ask you guys if I really should install that 2nd 680 or not with the PSU that I currently have. Here are my full system specs.... Please don't suggest anything unless you're 100% sure. Thank you.
i7 3770k @3.9ghz
MSI gtx 680 2gb 1x for now and hopefully after this thread is answer it'll be 2x
Corsair H70 cooling
MSI z77a GD65 motherboard
Corsair Vengeance 8gb memory
Corsair TX850w V2 PSU
3x 200mm LED fans, 3x 120mm LED fans, and 2x regular 140mm fans
1x 500gb HDD
1x DVD RW drive
Thermaltake VN300M1W2N Chaser MK-I Full Tower Gaming Case
 
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photonboy


Weird.

All I can suggest is try both cards in both PCIe slots, reinstall drivers, try a System Restore prior to your problem and if totally out of ideas get a spare drive and reinstall Windows...
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photonboy

photonboy

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Jun 20, 2006
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I don't understand the problem.

You had a problem, switched to a different bridge and it went away. That suggest the BRIDGE was problematic.

If it's working then there's nothing to worry about. If the Power Supply wasn't sufficient then you would again have problems.
 
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Well, here's the problem that happened next. When I removed my 2nd gpu, it seems like my frametime MS is starting to mess up or something. When I play WoW, suddenly everyone starts walking in place and nothing happens for 3-4 seconds then everything comes back to normal. After everything comes back to normal, frames start to pick up from about 20fps to 90. I'm pretty sure my internet isn't what's causing it. It's been doing the same thing for all other games too. Splinter Cell conviction gets spikes to 88ms...not sure what's going on here.
 
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photonboy

photonboy

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Jun 20, 2006
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Weird.

All I can suggest is try both cards in both PCIe slots, reinstall drivers, try a System Restore prior to your problem and if totally out of ideas get a spare drive and reinstall Windows (don't Activate) and drivers etc just enough to verify if the problem is still there.

If you reinstall Windows, have tested both cards and the problem still exists it's likely your motherboard though I'm really not familiar with that problem.

When you say "removed my 2nd gpu" I assume you mean physically and not just disabling SLI.
 
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Yes I removed the 2nd gpu physically. I re installed windows and now i'm looking into this latency problem. I have experianced two crashes on bf4 already though and the performance did not improve what so ever. Performance is still filled with microstutters. I asked a blizzard employee and showed him my msinfo.exe before I reinstalled windows and he noticed the huge amount of app crashes and errors that I've been getting, which convinced me to reinstall windows. Things aren't looking much better. I'm really sick of this problem and it's depressing the hell out of me. I only got this latency problem recently, but the microstutters I've been getting for years ever since i bought this damn thing. Such a waste of my time and money.
 
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photonboy

photonboy

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Jun 20, 2006
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Performance should be identical in BF4 with the 2nd card removed if SLI wasn't supported yet in the first place.

Microstutter:
Is this in all games, some games?
Does it happen with ONE card or mainly with two in SLI?

As for you latency issue, quite frankly I'm stumped. It seems like your troubleshooting has narrowed it down to the MOTHERBOARD (happens on either graphics card, not software if Windows reinstalled).

I can't find any reference to your issue elsewhere though and even with my computer training can't visualize how this could happen.

Since I don't believe it's been mentioned:

run MEMTEST (or at least Windows Memory Diagnostic). RAM issues can result in some pretty wonky problems (assuming "wonky" is a word).
 
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