I've just flashed the bios to 504 from 501, both are practically the same no difference, using i5 2500k. It seem's its random whether changes in bios take effect after a reboot, for instance enabling Intel Speedstep/Turbomode or Vengeance XMP. Also I had troubles setting Dram timings and enabling XMP, which resulted in an error "Overclocking failed press F2..". Right now even though I set the CPU ratio (multiplier) to 38x, my CPU speed is still on 3.3Ghz, checked on Real Temp & CPU-Z. Also when in Bios it also has some graphic errors, like my mouse curser will leave traces on the screen, and only disappear when I move the curser back over them..earlier this week I tried assembling a CPU cooler on it, and might've used more force than necessary, could this be a bios issue, or perhaps damage to the bios chip and/or CPU itself? Running Lin Pack (Intel Burn Test) for 30 minutes gave me an error: [img=http://s8.postimage.org/xn3g04l4h/Linpack.jpg] UAC was disabled at the time..