the resets are caused (most likely) from over drawing your power supply.
check your wattage and amperage draws on your GPUs and CPU.
make sure they don't pull too much Power/Amps.
like in my case...
Antec 900w 80%+ Bronze cetified
4x 12V+ rails 40 amps each across 850w
GPUs dual r9270 DCUII OC 2GB each draws 500W 38 Amps total (1000w @ 76Amps)
CPU 125w
technically I should upgrade my power supply, just due to power draw of gpus alone.
you should also take into consideration, that every thing in your system draws power.
mother board, ram, case and cpu fans, cooling units. It all adds up.
when you have settings on ultra, the power/Amperage draw probably exceeds
what your power supply can handle, and therefore turns itself off and restarts.
this is VERY BAD FOR YOUR SYSTEM.
not only can it corrupt data, when it resets,
but it can damage your hardware as well.
Double and triple check the power requirements of your hardware,
and make sure they don't exceed the limit of what your power supply, can supply.
not only that, but if your power supply can't supply enough power to all your hardware,
you cannot utilize it to it's full potential... i.e running games with ultra settings, etc.
