Figured out the problem
Turns out that there was no problems with the hardware at all. I did some research and got myself GPU-Z to determine GPU temp. My GPU was only running at 58 deg idle. problem was happening from somewhere else. So i read up on the 680i and found out that there was a driver update for 1066 and 1333 mhz processers. Since my e4500 was running at 800 mhz it was no problem, but once the e8400 went in it raised the FSB to 1333. Man am I happy. So future reference, always read up and update drivers
Never thought that the mobo was out of date that much.
Now my pc is running steady with new specs:
e8400 @ 4.0 ghz
EVGA nForce 680i sli
6 GB RAM (4 GB patriot Viper RAM/2 GB corsair Twinx XMS2 RAM)
2 x 8800 GTS 512mb OC
500 GB HDD + 160 GB HDD
didnt have time to SLI the cards last night but will do so today and test out how the clocks settle with gaming.