SB Overclocking problems

[MikeHiow]

I seem to have hit a wall at 4.6GHz with my 2500K and P67P8 (Beta BIOS).

That is with;
Vcore: 1.34V (1.35 in CPU-Z)
Mem: 1.55V
PLL: 1.80625
SA: Auto (Although tried at 0.96875)
IO: Auto
LCC: Extreme (100%).

I tried 4.7GHz with as much as 1.4Vcore and 1.85 PLL but windows would not boot. It did not bluescreen, but simply froze on the little windows logo.

Any suggestions? Is 4.6GHz likely to just be my limit on this chip, or am I missing something/doing something wrong?

Temps seem OK with 4.6/1.34V with highs between 72 and 76 across the four cores.

Also, how do I get it to down the voltage when clocking down to 1.6GHz? Seems pointless for Speedstep to be enabled if it is staying at over 1.3v.

 

[MikeHiow]

A bit of everything really, however I do not wish to clock it out of necessity, but rather just 'because I can'.

 

[MikeHiow]

All my settings are within recommended limits (VCore was actually suggested to be OK upto 1.42V, but 1.34V for 24/7 use - I'm 0.01V over!). I'm sure I could knock the voltage down a bit yet, but I was planning on running Prime over night first.

As for LLC set to extreme, this just means I get the voltage I'm actually asking for, from what I can see - People with lower LLC just seem to be getting less than the VCore they set.

As for stability, I've done a 20 minute Prime session, played some Black Ops (now we all know how CPU hungry that is!) and done some heavy photoshop stuff - all without a glitch. But as I say, I shall run Prime overnight to double check.

 

[MikeHiow]

6 Hours Prime was fine.

 

[MikeHiow]

Knocked LLC down to 75% and now voltage fluctuates between 1.336 and 1.344 - ran a quick prime and it seems ok thus far.