Need tip on stablizing my OC (i5 @ 4.7GHz)

[OJay]

Got my i5 running at 4.7 GHz at offset +0.050 (leading to a vcore of 1.344 under load in CPUz). It is OCCT CPU test stable for 3 hours and prime95 stable (small FFTs). My RAM is rated at 1600 9 9 9 24 @ 1.5V. I set it manually and run 3 memtest intstances, 0 errors after 100% coverage,

NOW; I run prime BLEND test and after like an hour I BSOD. What should I exactly do now? RAM alone: stable, CPU alone: stable, RAM+CPU load: unstable. I bumped the offset to 0.055 and prime blend again BSOD'ed. I'm beginning to think its not vcore related.
.. should I bump the VCCIO?

BIOS settings for CPU are:

Everything is default except
multi = 47
offset = + 0.05
Duty Cycle = 350
Spread SPectrum = disabled

So

 

[OJay]

any ideas guys?

 

[tweakboy]

That is a very high OC for that chip. You should settle at 4.6Ghz OR , raise your CPU voltage to like 1.41v to get it stable. Also watch the temps... gl

 

[OJay]

dude..... thats an average OC, and SB's shouldnt go over 1.4. id like to keep mine below 1.35V.

 

[tweakboy]

I see you got yours @ 1.344v for your OC, very nice!!!

When you say shouldnt go above 1.4v that is not a proper statement. If you dont have proper cooling it shouldnt go to 1.4v, but if your running under water or a massive HSF then you can go to 1.4v and reach 5Ghz stable on that chip..... gl

 

[OJay]

It's not just the heat with these chips. I believe its just that high voltages degrade it due to electron migration. That's what I know.
But really the question is; what is causing the blend test to BSOD?

 

[tweakboy]

Hmmm that makes sense,, but I would still figure if its kept cool or under certain degree for its life span,, it can have a longer life span..