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Overclocking help. Q9550 + 750i FTW

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January 19, 2010 9:25:05 PM

Currently I have my cpu stable at 3.4GHz. Obviously though, I wantz more gigahertz :bounce:  . I have tried going to 3.8 with no success.

Currently I am at

3.4GHz
vcore: AUTO - 1.35 (kept screwing around with it and for the hell of it i tried AUTO and it has worked perfectly at 3.4)
FSB: 1.4
vRAM 1.8
nForce SPP: 1.5
NF200: AUTO (default, 1.2)

I would really love to manage 3.8, temps are not an issue, it is the fact prime95 peters out when testing for 3.8. This is what I have been doing. Lowering my multiplier to where I know my CPU runs stable, raising my FSB to (1800 for 3.825) Then running a blend test, which usually fails (freezing or error).

WAs wondering on any suggestions? I hear that it is fatal to raise the FSB voltage on a 45nm chip above 1.4, is this correct?
a b K Overclocking
a b à CPUs
January 19, 2010 11:53:58 PM

I tried getting mine up to 3.6Ghz and kept hitting a wall.

It's perfectly stable and happy at 3.5Ghz and my NB voltage is just 1.28V with vCore at 1.31V.

Where it gets a bit confusing is that different mfg's use different terms in the BIOS so I wouldn't know how what helped me translates to your equipment but in the end what got me stabilized was playing with DRAM Clock driving strength and DLL skew in the BIOS.
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a b å Intel
a c 197 K Overclocking
a c 172 à CPUs
January 21, 2010 1:57:08 PM

I can run my Q9550 (C3 stepping :(  ) at 3.6 GHz., Prime95 stable for 24 hours. It 'll boot at 3.8, but P95 fails practically instantaneously.

Intel's recommended max vcore is 1.3625 volts. I think Intel's absolute max is 1.45 volts.

I don't run over Intel's recommended max voltage. In my case I ran out of voltage (1.3625 volts) before I ran out of temperature (load temps 58 - 61 C), Antec 900 case and TRUE/Scythe S-Flex SFF21-F HSF.
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Overclocking since 1978 - Z80 (TRS-80) from 1.77 MHz to 2.01 MHz
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a b K Overclocking
a b à CPUs
January 21, 2010 2:06:36 PM

I agree with jsc totally in not exceeding Intel's recommended max voltage. It's not a good idea to do that with these processors.


@jsc........... sounds a lot like my experience too as I can boot at 3.8GHz but I simply couldn't get it to pass any tests there.

I also don't want to see my temps go any higher than they are so I'm content where I am.

The way I view it I'm getting 700MHz that I didn't pay for so I'm happy. :) 
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