4GB 1066 dominator unstable

Hey OCF

3 Days ago i replaced my 2x1gb Kingston 667 memory with 2x2gb 1066 dominator ram. i OC'd my cpu to 3ghz now my games keep crashing when i play for 5min.

Q6600 333x9 1.275v, idle 45c maxload 58c
4gb dominator @ 1200mhz (auto volt)
P5Q PRO motherboard newest bios
8800gts gpu factory clock
2x250 raid0 + 500gb backup
600w ocz stealthxtream psu

on my old 667mzh RAM i run stable on 3ghz with 1.275v

Anyone knows what is wrong plz tell me, im just a beginner so plz tell me everything i need to know.

btw im dutch

make sure to manually set timings and mem voltage as the dominators need 2.1 or 2.2
hope this helps

did you set the right ratio in the bios?

run memtest?

1200 is a bit to high for the Dominators IMO. Set the Mem volts to 2.1 and lower the ratio 1 step.

Like the other folks mentioned, change the FSB Strap to North Bridge to 333/1066 (5:8 ratio); for a resulting 1066 MHz DRAM Frequency at your current FSB of 333 MHz.

Those should run 1100 5-5-5-15 2.0v
Make sure tRFC is ~55+