Help! Crysis runs perfect then freezes.

The setup for me on Crysis is Patch 1.2 and 1.2.1 with 1680x1050 res, No AA, Vsync enabled and all High settings. Now whenever I play Crysis on my new computer it runs almost perfect on these settings for a while and then out of no where the game just freezes and I have to reboot my system... If anyone can help me with this issue that would be sweet. My specs are -

700W ATX power supply
ASrock A780GXE/128M Mobo
Phenom II X4 940 3.0ghz with Thermaltake SpinQ heatsink
Crossfire 2 XFX ATI HD4850's 512MB
8.00GB Corsair 800Mhz memory
WD 1TB 7200rpm Hard Drive

Considering you named everything by name but the PSU I suspect the PSU is generic and crappy.

On older PC would most likely be drivers, heat, or psu. On new PC could be memory etc.

So, who built this computer and what is the make/model of the psu?

Couple more questions:

- When built?
- Ever run Crysis well before? If so, what has changed since then? have you tried reversing that change?
- Ever fail anywhere else?
- Ever been stress (Prime95) tested?

Without answers for the above, I'd advise starting here:

1) Download Prime95 to stress test and CPUID Hardware Monitor to monitor temps will doing it. Make sure Prime95 has "Detect Rounding Errors" checked.

2) Run on all cores for at least an hour. Temps will climb. Watch temps, stop test if core temps cross 75C, or run up *very* rapidly with no sign of levelling off.

3) Other than for heat, if the test fails or crashes, repeat with one stick of memory. Test each stick until all 4 pass or one or more fail.

I'm thinking PSU problem. First though run memtest through a couple of passes to be sure it isn't the RAM. After that run Prim 95 for a while and use Everest or something to monitor your temps. If your CPU is overheating it could be that you didn't apply the thermal paste right or your SpinQ isn't properly seated. If all that turns out fine then I would start looking at the PSU.

let crysis set the video optimally for you. the exact same thing happen to me and it was when I manually set the settings in the video. you probably set them to high and that's what is probably causing your lockups.