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955 C3 @ 4.5Ghz help

post #1 of 13
Thread Starter 
Well as the title reads i wanna push my chip to 4.5Ghz.

I just tried to but i had to go from 4.25Ghz @ 1.44v to 1.53v to get into windows without testing as wasnt happy with that sort or voltage.

Why is there such a big jump to get the extra 250Mhz?

My temps at 4.25Ghz get to around 53-55c max under load.

These are my settings so far for 4.2Ghz:

250x17 (4250)
HT is at 2000Mhz
NB-CPU is at 2760Mhz @ 1.3v
Ram is at stock timings 9-9-924 @ 1672Mhz @ 1.65v(stock)

All other voltages are set to auto.

Is the any other settings i can bump up to help stability other then the vcore?

Thanks.
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Fear The Badger
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post #2 of 13
its kind of like a car getting from 0-100 isnt very hard but going from 100-200 is well over 4x harder! you could try loosing your ram timings maybe
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post #3 of 13
I hate to say it, but your going to need a better cooling solution to get more out of that chip. Air cooling, or the H70 isn't going to do it without some seriously low ambient temps, and even then it won't be stable. You'll need a proper w/c loop to float that high of an oc.
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post #4 of 13
Too much for that CPU on that CPU cooler. You will need Phase Change for that clock(or higher)
Edited by IOSEFINI - 4/11/11 at 12:23am
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post #5 of 13
Thread Starter 
Well i was meant to get a RX360 kit last week but had to put it off. So if i get that loop will i be able to get it with a lower vcore or will i still have to use that much?

Are there any other voltages i could bump up to add stability?
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post #6 of 13
For 4.5GHz? Check my sig and you'll see.

That capture had the system stable during two seconds, the time I needed to validate the screen.

And I used two 240 rads with two Ultra Kazes and an EK Supreme HF to cool the chip so...


Nah, seriously. 4.5GHz stable is very, very difficult to achieve with conventional cooling. You'd need a single stage unit, or a freaking golden piece of chip, a bit like SKl's i7 950 that does 4GHz on 1v.
   
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post #7 of 13
Thread Starter 
Thats a little dissapointing ha oh well ill get the water kit just to drop the temps. Maybe ill try then just to amuse myself.
Fear The Badger
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Fear The Badger
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post #8 of 13
Try using the multi more then the reference clock.
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post #9 of 13
Yeah that will be extremely difficult without a phase change, even on water that is almost impossible, not impossible, but practically speaking, it is. The highest I've gotten a 955 to on water was 4.25ghz stable, which is still an amazingly good OC for the 955 on a gigabyte 770A! lulz biggrin.gif
post #10 of 13
It is possible. I have mine on a cheap loop with a 240 rad and can bench at 4.5 no problem. See here. Not 100% stable but pretty close.
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