Computer Freezes Up Frequently

Just got some parts for a new build, and here are the specs, before i go into details on the problems

Phenom ii 955
2x2gb pny optima ddr3 1333
Foxconn a7da-s 3. 0 motherboard
Corsair tx750 psu
Dual xfx 4890's
Wd 500gb hdd (used previously in another build, know it works)
Soundblaster creative audigy 2zs

All parts except for the hdd and soundcard are new

Now, problems started as soon as i finished the build. The rig would artifact in windows and playing games. After a day of troubleshooting, it turned out to be 1 stick of ram. By this point i had tried numerous drivers and reinstalled windows, but it seemed to run fine after that, except every few hours, sometimes less, the system would just freeze up. No bsoding, just audio stuttering and a freeze. I couldn't ctrl alt del out of it either. Now i have new ram on order, but before i bank on that solving the problem, is there anything i can try? I've run 3dmark06, and that ran just fine. Prime ran fine too with the good stick of ram, and had no errors, until the system froze after 14 iterations of prime. Everything is at stock clocks and volts. Temps on the cpu have never gotten above 60c at full load, and gpu's stay at about 70c at load. Both are within the acceptable range, i think. Sometimes when the system freezes, but not always, i will reboot and get a cmos checksum error, or an error telling me to reset the time. Thinking the cmos battery could be dying, i tried to replace that as well, to no avail. Frankly, i'm out of ideas. What shall i do?

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