Game Crash Issues

[AbhieSpeaks]

Well, I'm just starting an upgrade process to my existing AMD APU system. I recently bought one XFX 7870 BE to replace the old 6670. I am planning to get the FX 8350 and the ASUS MB. My current spec:

CPU: AMD A8 3870K @ 3.5Ghz
MB: MSI G55MA
RAM: GSkill Sniper 2x4GB @ 1600Mhz
PSU: Seasonic SII 430W
GPU: XFX DD 7870 BE @ Stock
Cabinet: NZXT 210 Elite Source
Cooler: CM Hyper 212
Optical: LG BR Drive
Misc: NZXT Fan Controller & Card Reader

After the GPU replacement, though I have noticed significant performance boost on ultra settings on all the games I play but I have been getting pretty frequent game crashes to desktop after say 30 mins to 1 hr of continuous play. I do see the GPU temperature reaching high 60's even 70's in GPUZ. My question is, what is going wrong? I have a pretty airy cabinet with 2 intakes and 3 exhausts. Is the PSU too small to handle the system? Is the GPU at fault? I am clueless here. Please help.

 

[tiny voices]

Technically the PSU should support the GPU. Its really tight, but it should work. Those temps are alright.

You could be pulling too much power. Your CPU uses 100w stock. Decently more than most CPUs.