"bad" batch of M0 C2D cpus?

[nonameo]

I have a friend that is overclocking his M0 e4400, however it seems as if his clock speeds just aren't going up. He can't run 2.35 with an aftermarket cooler(OCZ vendetta) and his temps are fine(44 @ load). He's increasing his voltage a tiny bit as we speak, but I don't know how much that will help.

In any case I have heard that there was a "Bad" batch of M0 cpus at one time that didn't clock well... but damn, 2.35? come on. Surely this "bad" processor can do better than that?

Anywhoo, a little advice from anyone that has experience with one of these troublemakers would be appreciated

 

[Gillbot]

Does it run ok at stock speed? If yes, then how is that a bad cpu? It does what it's supposed to.

 

[nonameo]

Does it run ok at stock speed? If yes, then how is that a bad cpu? It does what it's supposed to.

ok, I should clarify "bad" as a bad overclocker

come on, you know what I meant

 

[happy medium]

Put the voltage at 1.45
put the fsb at 275
set the memory divider at 400
That should get you to 2.7 easy

See how that works out

Get back to me.
Tell me your temps.

 

[nonameo]

I think the problem might be in his ram... we were playing with the mem stuff as you suggested HM and he is now at 2.4

 

[happy medium]

That cpu should do 3.0 in it's sleep.
Stop being a sissy and up the fsb and voltage.
You can give that cpu 1.4 volt easy without harm.
Don't go over 1.5 though.

What memory does he have? ddr800 or ddr1066
What voltage are you at now?
Crank the fsb up to 275 with 1.35v.

 

[nonameo]

That cpu should do 3.0 in it's sleep.
Stop being a sissy and up the fsb and voltage.
You can give that cpu 1.4 volt easy without harm.
Don't go over 1.5 though.

What memory does he have? ddr800 or ddr1066
What voltage are you at now?
Crank the fsb up to 275 with 1.35v.

its doing 3 with 0.02 extra volts over stock.
edit: dropping the mem divider did the trick.

 

[happy medium]

its doing 3 with 0.02 extra volts over stock.
edit: dropping the mem divider did the trick.

Cool.

Keep going till your temps reach 70c under prime stress test.

Try to keep the voltage under 1.5

You should get 3.2/3.4 with 1.375 volts under 70c prime.

Good luck.
Tell us how it goes.

 

[betasub]

LOL @"bad cpus"

happy medium has shown you the light - memory divider, voltage - as would any overclocking guide.

 

[Sahakiel]

Over 10% overclock with stock voltage is a reasonable expectation. Production distribution skews towards higher clocks near the end of the lithography process' lifetime only as a side effect from refining meant to increase yields. Still means that with a large batch, there's still a bunch of functional units occupying the slow end.
Your friend simply ended up with one of the chips from the slow end. It may have required a bit of fixing before it could be packaged and sold, so it'll never run as fast as some of the cleaner dies.