Cpu load + gpu load=crash???

[eclipseturbo4]

ok well whats going on i have a custom computer that i built and every time i play a game or put a substantial or semi-substantial load on the cpu and gpu my computer shuts down and restarts my computer specs \/

asus m5a99x evo rev 1 motherboard
amd fx-8350 cpu
two xfx r7770's in crossfire x
a 4tb Barracuda drive for storage
a 1tb barracuda drive for my os
8gigs of ripjaw 1600 ram
for cooling i have a corsair H100I the rad is in a push configuration.
and the normal front intake and rear exhaust.
for power i have a rosewill 750 watt psu 80plus bronze.

Im not overclocked on anything cause im trying to figure out what is going on before i do much for overclocking..
i really want this issue to go away i got almost all the way through on borderlands 2 overclocked and in crossfire but now i cant play 10 minutes before the audio goes into a loop and the game freezes and if i leave it nothing changes.
please somebody help me with the prob. it'd be greatly appreciated.. ive tried a fresh install of windows and changing my bios to defualts..

 

[wiggbot]

I suspect your PSU is the issue.

Odds are you've got more than one 12v rail?

Look into getting a higher quality PSU with one big +12 rail, such as a Corsair tx850.

 

[eclipseturbo4]

I suspect your PSU is the issue.

Odds are you've got more than one 12v rail?

Look into getting a higher quality PSU with one big +12 rail, such as a Corsair tx850.

thats the thing hwmonitor is saying all my voltages are safe they dont drop below 12v and my cpu votages stay at a pretty static 1.4 volts.

 

[scout_03]

@ wiggbot you right is psu got 4 output on the 12 volts rated 20 amp each max . to eclipseturbo4 you graphic card must drain all the power and oyur psu could not handle your 2 graphic card follow the advice .

 

[eclipseturbo4]

@ wiggbot you right is psu got 4 output on the 12 volts rated 20 amp each max . to eclipseturbo4 you graphic card must drain all the power and oyur psu could not handle your 2 graphic card follow the advice .

well if the psu's the problem y was i able to get all the way through tomb raider 2013 and almost all the way through borderlands 2 in crossfire with the setup i have above without a problem then one day playing borderlands 2 my comp freezes.. idk im just frustrated with this stupid thing..
My psu does have a single rail. its the hive series 750 watt.. it says its sli and crossfire ready. thats y i got it.. i dont mean to be debating the psu is literally 3 months old. i dont want a bad rep here im just trying to get to the bottom of it..

 

[scout_03]

your right i had the wrong psu in the link since this psu is modular and have 4 pci-e output did you try the other cable or the other output i would also try with one graphic card at the time and using card no 2 in slot 1 .

 

[eclipseturbo4]

your right i had the wrong psu in the link since this psu is modular and have 4 pci-e output did you try the other cable or the other output i would also try with one graphic card at the time and using card no 2 in slot 1 .

i tried them they dont make a difference still crash.

 

[scout_03]

it will crash with only one card .

 

[wiggbot]

The majority of the time, your PC shutting down under load will be either a faulty PSU or an overheating problem. If you're sure your computer isn't overheating, it is probably the PSU.