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i7 950 overclock 4GHz+

dan7827

dan7827

dan7827

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1 Jan 2005
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Stoke
Hi all,
Been out of the loop for a while, decided to go quad core and splashed out on an i7 rig: i7 950 + gigabyte ud3r + corsair xms3 + frio cooler. After a bit of playing in the bios 4GHz came easy but any more needs a load more volts, heres the best it has managed so far with HT on.



Are these temps ok? have I reached this limit of this cpu?

any pointers would be ace, thanks.
 
Temps are about spot on, so no need to worry there, have you tried tweaking it anymore to see if you can get that clock stable at a lower vcore/qpi?

If you can't i wouldn't worry the temps are still fine. Nicely done.
 
hello there.
temps seems perfectly fine for that clock.
voltage however seems kinda high, see if you can get it stable using lower voltage(cpu).
 
Thanks for the replies, I will have to wait for it to finish this testing but I think it failed linx @ 1.375v cpu after 8hrs, I will double check my settings for that run.

This cpu seems to hit a wall at 4GHz, is there anything else to increase so the cpu voltage can be lowered?
 
Update on the voltage: it did fail at 1.375v and 1.38125v but 1.3875v is stable.

Can I change some other settings to get the cpu volts down with the same stability :confused:

@R5Rich
It is still testing at 21x200 same settings so it should be stable with a tiny improvement in mem bandwidth, fingers crossed.
 
i'd def try 21 mult. the blk should be fine upto 205-215.

duno about everyone else on gigabyte boards, But i will never use easytune; otherthan for fan speed control >.<

try playing around with the PLL voltage and VTT. should be able to lower the vcore some more.
 
yea, 21 multi seems just as stable so far..................touch wood.

The best thing about easytune is reminding me what volts I used to keep it stable :)

are you saying upping the vtt should keep it stable at lower cpu volts? or will it need a combo of cpu pll, qpi pll, vtt?
 
find a stable vcore first and go as low as you can on vcore. cpu clock interrupt BSOD will typically indicate it's too low Vcore. once done you'd want to get all voltages "just right". QPI PLL can usually be lowered (not sure figures for i7950). when optimizing vdimm you'd want to use prime95 blend, even if you pass linux, in such instances bumping vdimm up a notch is all it takes. CPU PLL defaults to around 1.8 (I think) it can be lowered some more.

once all those are at optimal levels, the vcore could be lowered a little more.

It takes a long time, i dont bother unless I'm pushing a particular chip near 24/7 usage limits.
 
It doesn't seem to blue screen on the volts a few below on the cpu, just gets an error in linx so it looks like it is on a knifes edge even at the slightly lower volts. The qpi pll & cpu pll volts I put a few above normal and have no idea if it would be unstable back at normal? vdim is at the rated amount for the speed & timings, is there any benefit lowing it?

If it helps get the cpu volts down to a safer amount I will have a go tweaking some other settings, at a bit above normal though the cpu doesn't seem affected, maybe this one just likes the higer volts :confused:
 
the temps & volts are fine really. tweak around, chances are the vcore can be lowered, but no worries if you can't. it's not like you'll lose any significant temps, it's safe. sounds pretty much like your chip liking the volts more.

turbo, and HT add's allot to temps though, and load line calibration is off i assume?
 
It seems ok but again then it is winter, not sure how high they would get at any other time, I know i7's run hot but its in a completely different league to any cpu I have had lol

cpu settings are: HT is on, Thermal Management on, prochot on, virt on, turbo off, speedstep & power saving off. LLC was normal to begin with but the vdroop on this board mean't it got way more stable with it on, currently set at level2. CPU-Z & others show this at 1.375v real.

Any reason why core #3 temp is always lower? tried reseating the cooler a few times before & it made no difference, On those max temps its 6degrees.
 
That's good news, bad news is at 4.2GHz using 21x200 not the 23multi also passed 10H 30Mins in linx but I left it overnight to see what would happen, disapointed with the result :(



What will make it more stable? Don't want to put the vcore up, I left some other volts low so would increasing qpi pll help?
 
Have tried upping vtt, cpu pll, qpi pll a notch but it failed at 19H linx.

Is it worth putting the vcore up or put the bclk down so it's running just under 4.2GHz? Don't want to admit defeat! :)
 
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