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Good or bad clocking i7 920?

post #1 of 12
Thread Starter 
Hi Guys,

Anyways I have been OC'ing a bit recently and finally found a nice setting for me.

My settings are below:

BLCK: 200
Multi: 21
RAM 2005Mhz (8-9-8-24-2N)
Vcore: 1.35
LLC: Fully enabled
PLL: 1.8
QPI/DRAM: 1.5125
Everything else is on auto besides the stuff in the CPU tab

This 4.2Ghz is 24 hours of blended and small fft's prime stable

Here is CPU-Z Validation: http://valid.canardpc.com/show_oc.php?id=1799637

The reason for my question is that I here it is the ram that is holding my chip back because it has a fairly week IMC.

Also do I have a good OC'ing D0 or a bad one?

Thanks guys
Mikrouwel
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post #2 of 12
What are your on load temps? Seeing that you're watercooling, @ 4.2Ghz @ 1.35v is is pretty fine.

What were you expecting? I don't see many D0's going past 4.4 tbh unless they don't care about survivability

Comps
post #3 of 12
Your QPI is way too high imo. I'm running stable at 1.25v i7 930 @ 4.0Ghz. I didn't overclock my RAM to 2000MHz though. How are the temps?
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post #4 of 12
Thread Starter 
My highest core gets to 71C after 24 hours of prime

I have friend that have i7 920 D0's that do 4.2Ghz at about 1.285vcore

I here that my QPI/DRAM is fine, its has to be within 0.5 volts of your ram and it is so...........

Mik
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post #5 of 12
The vcore is pretty average (maybe a little high) for 4.2ghz. However, your QPI/DRAM voltage is really high. Intel recommends a 1.35v limit, and I wouldn't go past 1.45v for 24/7. Do you really need that much to be stable? I find that hard to believe. I need 1.34v QPI/DRAM to run 2000mhz CAS 9 and my memory controller isn't that good I don't think.
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post #6 of 12
your QPI/VTT is high..staying on 2000mhz ram frequency you should be at least using around 1.42v..thats gonna be stable but sure is gonna be hot and high for the IMC..
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post #7 of 12
Thread Starter 
Unfortunately I do need that much

Have I just got some other settings wrong and I am correcting it by giving it lots or QPI/DRAM?

Mik
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post #8 of 12
Well every CPU is different. You might actually need over 1.5v for 2000 CAS 8. There's no way we would be able to tell you how much voltage you need, because it drastically varies from CPU to CPU.

Personally I would run that memory at 1600 CAS 5/6 and see how much QPI/DRAM you need. I wouldn't feel comfortable for a 24/7 clock at over 1.5v. Honestly memory speed doesn't make too much of a difference in real world usage. I can't tell the difference between 1600 7-8-7 and 2000 9-9-9.
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post #9 of 12
to me the settings seem fine lol

My 4.2 is at 1.3625Vcore and my Dram voltage is at 1.66V (rated voltage).

So it all seems fine to me
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post #10 of 12
Quote:
Originally Posted by Mikrouwel View Post
Unfortunately I do need that much

Have I just got some other settings wrong and I am correcting it by giving it lots or QPI/DRAM?

Mik
depends but it seems that your chip loves voltages more than tweaking..

Quote:
Originally Posted by Dopamin3 View Post
Well every CPU is different. You might actually need over 1.5v for 2000 CAS 8. There's no way we would be able to tell you how much voltage you need, because it drastically varies from CPU to CPU.

Personally I would run that memory at 1600 CAS 5/6 and see how much QPI/DRAM you need. I wouldn't feel comfortable for a 24/7 clock at over 1.5v. Honestly memory speed doesn't make too much of a difference in real world usage. I can't tell the difference between 1600 7-8-7 and 2000 9-9-9.
this is true..i can get to DDR3 2000mhz frequencies with just 1.45v on VTT..well every chip has its own identity so that isolates it out..but i'd also like you to follow his advise on running on 1600mhz for a daily use..it will be much safer and from stock it already has much gains..
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