800Mhz or 1066 RAM for Quad Q6600???

[Bouncing Zabaglione Bros.]

I mobo only allowed enough room for the arctic 7 pro cooler, it did bring my temperature down around 10-15 C over compared to stock.
it does look like its not completely stable cause OCCT runs fine for the 1Hr test, but i have run prime 95 an few times and once core 3 failed after 5 hours and another time core 4 failed after 3 hours.

I am trying to rerun them , but not sure if that means something is wrong or its a rare occurance.

Try using IntelBurnTest 1.7 . It's a front end for Linpack, which is what Intel use to stress their chips. It will hurt your CPU much worse than Prime95. It means you can run IntelBurnTest for 30 minutes and get the same results as many hours of Prime95.