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4.7Ghz O/C wont boot past Windows 7 splash screen

post #1 of 3
Thread Starter 
Hi All,

First off all, apologies if this question has been asked/answered before, but I can't seem to find it then ;-)

My issue: I managed to O/C my i5 2500K to 4.6Ghz with:
*Prime95 running stable
*max temps of 69,79,81,75
+0.005 offset, +0.008 turbo boost.

However, when trying to up the multiplier to 4.7 the system hangs at Windows 7 splash screen during boot.

Any setting I can tweak to get it past this stage? Thanks!

i5 2500k + Scythe Mugen2 Rev B
ASrock P67 extreme4 gen3 BIOS 2.20
8GB RAM
post #2 of 3
Have you tried using a manual voltage? Sometimes a pretty high core clock can't handle well with a offset sometimes. Especially for a high clock like that. I sticked to manual voltage when I go past 4.5 GHz because it requires 1.315v to boot up my i5 3570K.
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post #3 of 3
its probably because the Vcore is too low.

When only using a +0.005 offsets the CPU only runs on the VID+0.005v.
Then the load vcore depends on how strong the LLC you have set.

But lets say it has 1.36v VID on 47 Multiplier, 1.36v + 0.005v = 1.365v for 4.7Ghz and is just not enough.

To get to 4.7Ghz you probably need from 1.38v to 1.42v Vcore (Wide estimation).

When you cant boot into windows its one of the first signs its not stable.
It probably needs more Volt just to boot into Windows, then getting Stable in Stresstest software probably needs a couple more notches of vcore.


Also saying you run +0.005v offsets tells us nothing. Because most CPU have different VID's for a Multiplier.

When you are in windows you can use CPU-Z to see the actual vcore, and just as example CoreTemp to see the VID that is currently in use.
Edited by prescotter - 11/19/13 at 7:42am
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