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Help with 4.2ghz Stability - Page 2

post #11 of 15
Thread Starter 
Well, I have a rock solid setup. Just ran LinX 40 passes and it passed.

CPU Multi: 23x
BCLK: 185mhz
DRAM Multi: 10x
QPI Multi: 18x

vCore: 1.35v
vTT: 1.425v
IOH: 1.36v
DRAM: 1.65v

Now I'm testing a 23x Multi with a 192mhz BCLK, for 4.4ghz. Pushing for low as possible voltage now.
Neo Maki
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Neo Maki
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post #12 of 15
Thread Starter 
Well, my hottest core is getting to 73C at 4.41ghz, is that too high? I heard staying below 80C is the best bet.
Edited by MiskatCitnamor - 1/23/11 at 9:40pm
Neo Maki
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Neo Maki
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post #13 of 15
Thread Starter 
Well, I have gotten 4.41ghz stable (so far... testing with LinX now, just did IBT on Maximum before.) My hottest temp is 75C, which I'm hoping is ok.

In order to get there, though, I've had to raise my vCore from 1.35v at 4.2ghz to 1.41875v (reports as 1.408v under load in cpu-z.)

I THINK that that is about average for a 950, but was wondering if any of the spread spectrum, differential amplitude or clock skew settings are known to help increase stability at a slightly lower vCore so I can get that down a bit.

Also my vTT is 1.45, but I think that that should be ok.

Another strange thing is that in the XMP profile for my RAM to run at 2000mhz it sets the vTT to a whopping 1.7! Why the hell would it want that much voltage? Is there any benefit to that?
Neo Maki
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Neo Maki
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post #14 of 15
I'm surprised you're not throwing BSOD 124 codes- that QPI / Vtt is VERY high considering you're just at a 18x QPI multiplier (where 36 x bclock is the general max) and underclocking only 6G of RAM. Perhaps you're just using different references than I am thinking, but your link data rate should be 6660.

I'm glad you're stable... don't get me wrong- but you might want to drop that a bit for "efficiency" and OC craftsmanship.

Otherwise the voltages look about right in terms of Vcore and that exponential increase that occurs after about 4.2.
Edited by Eno75 - 1/24/11 at 3:56pm
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post #15 of 15
Thread Starter 
Well, the multiplier I'm using is 18 because it's the lowest I can go. Puts me right under 7gt/s. I hear going over that causes instability so I haven't there yet. I'm not running 1.7v on the vTT, though. That is just what my ram xmp calls for. Seems high I'm running 1.45v right now on vTT.
Neo Maki
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Neo Maki
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