I have a new Intel quad-core system Q6000 GO stepping, watercooled. CPU stock speed is 2.4 Ghz. I've been able to get the FSB up to 385 MHz x 9 = 3.465 GHz. But at 390 MHz the FSB eventually causes problems in my stress test. (My temperatures are under good control). I have the CPU voltage control up from stock of 1.30 V to 1.40 volt, System Memory Multiplier at 2.66. (I have 4 Gig of high quality RAM OCZ 1150 MHz DDR2--PC1150.) FSB OverVoltage control is at +0.10V; G(MCH) OverVoltage at +0.05. I can get into Windows and run my stress test, sometimes for 20 minutes, but then Windows shuts down the app. Other times, on moving the mouse, I get a black screen and reboot, and so have to go back to 385 FSB. From what I have read, 3.8 GHz CPU speed should be doable, e.g., with a fixed 9 X multiplier, I should be able to get the FSB up to aobut 422 MHz. Any suggestions?