Originally Posted by laxrunner
Anything above about 217 takes work. The highest I've ever gotten mine is right at 222, but it was in no way stable and gave BSOD instantly if I tried going to even 222.5. I've seen higher a couple times, but if I recall correctly those were at ~1.9V to the ram and 1.6V or so on the QPI and NB. Not sure what the Vcore was but those voltages are a lot more than you want to be pushing on a regular basis unless you have cash to low on new parts all the time.
Hmm...gives me food for thought.
At Bclock 220 and turbo on/HT off, I can get into Windows and surf Firefox (but nothing CPU intensive). That's using Vc 1.45, VTT +220, PLL 1.87, 1.65 to ram, IOH 1.3. Since my 1600 mushkins tend to give me constant C1 beeps (they ring in my head now) when clocked over 1730 despite lots of power and loose timings, for higher CPU clocks I run the RAM at a lower multi (end up in low 1300's mhz) with tighter timings of 6-6-6-16.
Sooo....when trying to get bclock to 222 I've stepwise adjusted parameters individually, in different combinations, and all of them together up to the following levels:
I've upped the SB volts some and upped the IOH subcategories
I've adjusted CPU and IOH skew in different combinations up to 200ps.
Taken Turbo on and off
Tried different combinations of PPM, EIST, CXE on and off (keeping CXE off helps all my higher clock combos)
Tried disabling QPI fast link
With 222 bclock I still can't even get to a beep or a blue screen to direct me to a problem to address. I just get a brief power on/shutdown and an auto reboot in safe mode with a generic overclock recovery screen (that doesn't even have the decency to be blue).
I haven't tried the massive voltages to NB and RAM you mention folks used. RAM because it's underclocked from spec anyway, and NB because it doesn't make sense to need such a huge jump for another 1 mzh clock.
But, my NB is on water so maybe I'll try cranking up the IOH a lot more.
While I don't want my chip to fry under my nose, my longevity expectations are limited to the next significant processor release.