Originally Posted by Forceman
What are your settings in the BIOS - specifically for the CPU voltage and LLC? Does that board have an option for both an offset CPU voltage and additional turbo voltage (which appears to be a new add for Asus)? Try setting something in the middle of the range for LLC (probably High if it uses names) and then set a small positive offset (using the voltage offset if available, otherwise using the additional turbo voltage) like +0.005 or whatever the smallest value is. Then boot up and put it under load and see what the voltage is. You will probably need 1.35-1.38 for that speed on that chip.
You might also want to post a CPU-Z and Coretemp/Realtemp screenshot under load, so we can see what is happening.
1.32 for a 45x2500K is spot on. 1.35-6 - ~46x
Make sure you disable all sleep states except C1E when using offset (at least initially) Max out short and long duratrion power, limit it to 1 second. CPU LLC at the middle compensation to vdroop. disable internal phase lock loop, leave the stsyem agent on auto, set your XMP and dram volts correcylt (all this is of course after memtest stable). speedstep enabled.
at all times pay attention to temps - your thermal solution will cap the frequency.
If you want to tune stepwise: with offset at the first positive option (prob 5mV) and turbo at the same first available positive mV, set multi at 39, post and boot to windows.. repeat and up multi by 1 until it will post but not boot to wndws. POst to bios, increase turbo 5-10 mV. if it will boot, run p95 for 10 min note CPUZ vcore. repost up the multi by one and add 40-50mV to turbo, not offset! from this point forward each 100 MHz will cost 40-50 mV until you push it over the linear (now non-stock) VID curve. then each 100MHz can cost a bunch more or never work at any setting. When that happens lower CPU PLL and drop temps a few degrees.
edit - oh, by the way, fixed offset is great if you intend to fold or mine. otherwise use offset so Speedstep can do it's stuff.
run the first cycle and tell us how far you got.Edited by Jpmboy - 3/1/13 at 12:56pm