SLI'd GPUs: PC Black screening when underload

[alsius]

Recently I bought a second GTX 780 to run in SLI with my current one, when I run games in SLI, for example Watch Dogs, Far Cry 3 & 4. Etc. the game will crash my PC.
The Crash isn’t a BSOD or anything, My PC ramps up the GPU Fan speed and goes black then after a minute or 2 it just restarts.
So far I’ve:
- Reinstalled NVidia drivers multiple times
- Switched the GPUs
- Tested the cards individually, they both worked
- Underclocked the GPUs

I’m not sure what is causing this issue, I’ve narrowed it down to the PSU or GPUs.
My PSU is a Hytec 950w.

 

[Vic 40]

My PSU is a Hytec 950w.

Since you already mention it would i look at this one being the issue.

 

[alsius]

My PSU is a Hytec 950w.

Since you already mention it would i look at this one being the issue.

I'll look into getting a different PSU, would you recommend any?

 

[Vic 40]

Don't know where you live,but something like these,
http://pcpartpicker.com/parts/compare/cooler-master-power-supply-rs750amaag1s1%2Cevga-power-supply-220g20750xr%2Crosewill-power-supply-capstone750m%2Crosewill-power-supply-lightning1000/
some others,
http://pcpartpicker.com/parts/compare/evga-power-supply-110b20750vr%2Cevga-power-supply-110b20850v1%2Cevga-power-supply-220g20850xr%2Crosewill-power-supply-lightning800/
some of these are higher/lower wattage versions of the ones in that first link,just for if you want some more or even less considering that you don't really need a 1000watt.

There's also a new bios so maybe update that one.

You could also make a log with hwinfo32,
Open hwinfo32,
http://www.hwinfo.com/download32.html
check "sensors only" and click run,at the bottom click "logging start",choose a name and place for the log like "hwinfolog"@"desktop",do some stresstests.let it run for about 15 min. or till when the pc crashes,the log will be saved.
After that upload the log to a site without to much crap like "dropbox" and place a link here.I'll see if i can take a look at it to see if the psu gives bad voltages.You can also look for yourself with excel or libre office calc.

 

[alsius]

Don't know where you live,but something like these,
http://pcpartpicker.com/parts/compare/cooler-master-power-supply-rs750amaag1s1%2Cevga-power-supply-220g20750xr%2Crosewill-power-supply-capstone750m%2Crosewill-power-supply-lightning1000/
some others,
http://pcpartpicker.com/parts/compare/evga-power-supply-110b20750vr%2Cevga-power-supply-110b20850v1%2Cevga-power-supply-220g20850xr%2Crosewill-power-supply-lightning800/
some of these are higher/lower wattage versions of the ones in that first link,just for if you want some more or even less considering that you don't really need a 1000watt.

There's also a new bios so maybe update that one.

You could also make a log with hwinfo32,
Open hwinfo32,
http://www.hwinfo.com/download32.html
check "sensors only" and click run,at the bottom click "logging start",choose a name and place for the log like "hwinfolog"@"desktop",do some stresstests.let it run for about 15 min. or till when the pc crashes,the log will be saved.
After that upload the log to a site without to much crap like "dropbox" and place a link here.I'll see if i can take a look at it to see if the psu gives bad voltages.You can also look for yourself with excel or libre office calc.

Just logged Watch Dogs until it crashed, The voltages are all over the place under load. I'll have a search for a new PSU this weekend. Thanks for the help.

 

[Vic 40]

You're welcome.