game exits to desktop

game exits to desktop when oc'ed. i've run memtest86. once with stock speeds (cpu and memory). 6 passes, no errors. Then did overclocked speeds (2500+ to 3200+ buy just upping the fsb to 200, memory from 8-3-3-3 to 7-3-3-2.5) and 11 passes with no errors. Motherboard is 400 fsb compatable. Ram is kingston 512 pc3200 cl3 at single channel mode.

antec truepower 430 watt

memtest is not cpu intensive whereas perhaps your game is? Also what is your graphics card?

It's OK to gradually up Vcore to 1.8x volts. Up your Vdimm too. That's probably your problem.

Prime95 Torture test the whole thing for 12 hours.

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2100+ AIUHB 0248 MPMW
256MB Crucial PC2100 + 2x 256MB Kingston (Hynix chip) PC2100 @ 6 3 3 2
[152] FSB x 15 = 2280 MHz @ 1.8 Vcore with memory frequency at 100% [152] @ 2.77 Vdimm
37(min) C to 46(max) C Winter ; 42(min) C to 50(max) C Summer
Epox 8RDA+
Thermalright SK-7 with variable speed 80x25mm YS-Tech FD1281259B-2F
BFG GeForce4 Ti4200 8X 128MB; Antec SX-835II case ; 350W Antec SmartPower SL350
Five 80x25mm Ultra Quiet 18CFM Case Fans (NMB C3110KL-04W-B19)

ITs your CPU OC I think. I had a prob with BF1942 and C&C: Generals quitting to desktop with my OC. I backed it down just a bit and I was 100% stable. Then I burned in more and the OC was good.