I am very fed up with the GA-P35-DS4 rev 2.0 board I got around Christmas time. I began noticing problems after installing Windows Vista freshly on the PC I built around the board. The first manifestation of the problem was that certain applications would not install, instead giving CRC errors. It is now months later, and I have played around with this issue enough to understand most aspects of it but not what it boils down to other than a problem with the board or the BIOS. Other problems that may or may not manifest at times include: any RAM testing tool will claim my RAM is bad even though I know it to be good; Windows will sometimes not install; but 100% of the time (when I have particular CPUs in the board) certain games (including Neverwinter Nights 2, Crysis, and Bioshock) will not install, returning CRC errors and claiming the installation media is bad. Now, I have noticed when I put certain CPUs in the board (I have had the benefit of testing this with four different CPUs) the problem *never* manifests. The two CPUs which I can guarantee will have problems in the board are an E8500 C0 and a E6850 G0, both of which claim to be supported by the BIOS (I'm running F12 now). The two CPUs for which it didn't manifest were 2 different models of Conroe-L Celerons. I have tried this with many different sticks of memory (currently running four 1GB sticks of Corsair Dominator 8500C5). I have Windows Vista x64 SP1, but the same issues come up in XP 32-bit SP2. My power supply would appear to be powerful enough (a Seasonic S12 650Watter). I haven't had reason to vary the graphics card (a GeForce 8800GTS 512MB). This problem seems pretty strange because it doesn't show up randomly like a memory error, instead it shows up at set times in set processes. i.e., I cannot play through one area of Crysis without a crash; I constantly get the same error when installing NWN2, etc. I would really like this resolved so that I can use the CPU which I bought for this machine instead of a borrowed one.