Quote Originally Posted by Hornet331 View Post
^

whats your uncore multi?

Stock uncore multi afair is 18x -> and with 200mhz bclck thats 3600mhz. For such a high uncore clock you would need to increase the qpi V and the Ram voltage quite a bit.
My uncore was @ 4000Mhz (200x20), 200bclk 2:10 multi.
vQPI: 1.495v tried 1.455v, 1.415v no luck, 1.515v seems get worse


Quote Originally Posted by rge View Post
Like hornet said likely uncore issue or could be mem issue, with 166bclk and 2:12, memory is 166x12=1992mhz and uncore must be at least 2x mem (or no boot) so 24x166=3984mhz. Trying 201 with 10x multi raises both the mem and uncore, mem is now 2010mhz and minimum uncore is 20x201=4020mhz.

I would try 24x uncore, 168bclk, and 12x mem and if that works then it is a problem with the 10x multi. Some have had issues with particular bioses and certain dividers. If that fails to boot, then like Hornet said you need to raise qpi and ram volts, the extra 20 mhz mem and 40mhz uncore may not sound like much but you are getting up there where a little more uncore matters.
Thanks for the advice. Seems the plan is to sort out if the uncore that matters. However I think I've tried 2:8 divider with 20x uncore multi but it worked without a problem, will try to confirm that later.
I've tried 4400Mhz uncore by accident, with vQPI 1.495v it can boot up but just the response is kinda slow. and of course it's unstable.
UPDATE: I've test the 199 bclk 2:10 divider and it seems worked. Somehow the memtest didn't show up any errors nor any "unhandled exceptions" and passed the first loop of test without a single error. Again waiting to confirm that...