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Novice i5-750 OC @ 3.8

post #1 of 9
Thread Starter 
First post on here and I'm a novice at this so don't be too hard on me!

I've spent the last couple of afternoons trying to get a stable OC and I just wanted one of you experts to cast your eyes over it and see if there's any obvious issues.. Volts, memory timings, temps etc..

These are the volts I'm running in BIOS for this OC -

CPU Vcore -1.28v
CPU VTT - 1.225v
CPU PLL - 1.800v
vDIMM - 1.65v

OC results -



Any advice or tips would be greatly appreciated
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post #2 of 9
VTT and PLL can be a bit higher
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post #3 of 9
looks close to stable.. try running prime95 blend over night, let it go for at least 10 hours..

if no errors, your good.. Bump it up to 4.0 and try again
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post #4 of 9
Thread Starter 
Thanks for the replies.

I should have added that I did run Prime 95 blend test overnight (1am to 11am) and it was fine.

I've tried going for 4Ghz but it BSOD's after seconds in Windows. I dropped the memory divider down from 4 to 3 but it still didn't help.

Are my volts too low to support 4Ghz?
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post #5 of 9
Could be, see my system info...

Each cpu is different, I have seen guys at 4.0 with 1.29v core and 1.26v vtt..

Mine needs 1.352 core (load) and 1.34v vtt
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post #6 of 9
Quote:
Originally Posted by 10acjed View Post
Could be, see my system info...

Each cpu is different, I have seen guys at 4.0 with 1.29v core and 1.26v vtt..

Mine needs 1.352 core (load) and 1.34v vtt
I think I was really lucky with my 750. This is an old pic from when the ambient temp was -5 in my conservatory



Some people are just lucky I guess
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post #7 of 9
Quote:
Originally Posted by runeazn View Post
VTT and PLL can be a bit higher
Yes, VTT should be quite a bit higher. Intel recommends max 1.355, though I personally have mine at 1.455 with no real problems.

However, I have NEVER had to raise CPU PLL on a board. I would NOT recommend raising PLL. It causes quick degradation. In fact, most people have more stability when LOWERING CPU PLL. I prefer to keep mine at 1.5-1.6 personally, but sometimes 1.7 is necessary.

I do not recommend raising CPU PLL. It almost never helps stability and causes quick degradation. It is a much better idea to lower it.
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post #8 of 9
Quote:
Originally Posted by Airolden View Post
Yes, VTT should be quite a bit higher. Intel recommends max 1.355, though I personally have mine at 1.455 with no real problems.

However, I have NEVER had to raise CPU PLL on a board. I would NOT recommend raising PLL. It causes quick degradation. In fact, most people have more stability when LOWERING CPU PLL. I prefer to keep mine at 1.5-1.6 personally, but sometimes 1.7 is necessary.

I do not recommend raising CPU PLL. It almost never helps stability and causes quick degradation. It is a much better idea to lower it.
The strange part is Intel Absolute Maximum for the i5 700 series is.
CPU Core - 1.40v
CPU VTT - 1.40v
CPU PLL - 1.98v


I have not seen anyone need more than the default 1.80 tho...
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post #9 of 9
Quote:
Originally Posted by 10acjed View Post
The strange part is Intel Absolute Maximum for the i5 700 series is.
CPU Core - 1.40v
CPU VTT - 1.40v
CPU PLL - 1.98v


I have not seen anyone need more than the default 1.80 tho...
Hmm I always thought that Intel's max CPU PLL was much lower than that.

I still would never recommend raising it.
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