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Lynfield i7 overclocked 4 ghz , stable with ultra low IMC voltage - Page 2

post #11 of 13
16 QPI ratio is as low as I can go.

If this Processor craps out then I bring this one back and belly up $40 (warranty) and get a 2600K. wink.gif Add a MOBO and some RAM and I am back in business, Upgrade Style! thumb.gif

But yes, I agree with you. I really enjoy the 161 clock'd up stock settings for everyday computing. It is awesome fast on just about anything and the temps are super low. I mostly play BFBC2 and I can't tell too much of a difference in most gaming situations from that near-3.9Ghz tune works flawlesly when even compared to my 4.12ghz tune. Only real difference is 15C lower max temps during gaming...

What MOBO do you have again?
Edited by gtfoxy - 2/14/12 at 6:01pm
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post #12 of 13
Quote:
Originally Posted by sakibchy View Post

interesting, did you change any other settings as well and what mobo you are using ? frankly speaking, 1.28 Vtt/imc still high , dont you thing ?
Quote:
Originally Posted by sakibchy View Post

i agree with you of course. With due respect however , i did say that higher settings may not kill the cpu even after years, but it might reduce the functionality of the cpu in such degree that it may not be noticeable in general uses but in highers games or video encoding etc. I know a friend who recently upgraded from lynnfield to AMD FX 8120 because he lost faith in intel as he overclocked his cpu with such settings that is suggested by most major websites which is something arround a 210 blck with 20 multiplier , 1.35 and 1.38 respectively and within afew months he saw a frame rate drops in some high end games like BF3 , MW3 and specially in skyrim wheres mine was at least 10 FPS Higher . We both have same mobo, cpu and ram .... only difference is that mine was running at default speed and he was at 4.2 ghz ! and when i overclocked mine @ 4.0 ghz, i was well ahead 13 fps higher than him !!
Are you sure that the fps drop was caused by the CPU?Because there's many variables when talking about losing performance in games,not just a "degraded" CPU only.
If the CPU is the problem then i suspect the heat is the real problem.Your friend's CPU did not degrade,it throttled itself down due to extreme heat caused by the high voltage setting (1.38v IMC)
Quote:
Originally Posted by sakibchy View Post

interesting, did you change any other settings as well and what mobo you are using ? frankly speaking, 1.28 Vtt/imc still high , dont you thing ?
Asus P7P55D,the most basic mobo in the P55 lines biggrin.gif

I tweaked some other setting,let's see:
BCLK: 200Mhz
Ratio: 20
QPI: 3600MHz
RAM: 1600MHz 9-9-9-24 1.55v
Vcore: 1.35
IMC: 1.2875
PLL: 1.8
PCH: 1.05
PCIe: 101MHz

Load-line calibration is enable and spread spectrum is disable.

Also my CPU is an engineering sample so it requires more voltage to keep it stable.
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post #13 of 13
Quote:
Originally Posted by Silent Knight View Post

Are you sure that the fps drop was caused by the CPU?Because there's many variables when talking about losing performance in games,not just a "degraded" CPU only.
If the CPU is the problem then i suspect the heat is the real problem.Your friend's CPU did not degrade,it throttled itself down due to extreme heat caused by the high voltage setting (1.38v IMC)
Asus P7P55D,the most basic mobo in the P55 lines biggrin.gif
I tweaked some other setting,let's see:
BCLK: 200Mhz
Ratio: 20
QPI: 3600MHz
RAM: 1600MHz 9-9-9-24 1.55v
Vcore: 1.35
IMC: 1.2875
PLL: 1.8
PCH: 1.05
PCIe: 101MHz
Load-line calibration is enable and spread spectrum is disable.
Also my CPU is an engineering sample so it requires more voltage to keep it stable.

Wish I had load line calibration...sad-smiley-002.gif I was real close to your set-up at those clocks. You can lower your QPI more than I can... that's my limiting factor with Vttt...

But I can run 4Ghz about 1.28-1.30Vcore...as read, but I have to program 1.425V in the bios to hit it... That will cary me to where I am now but at 4.12Ghz. I prefered the 22 multiplier at around 187 for a similar tune energy and heat wise.. was higher Ghz but the heat generation is the same at a higher TDP with the higher multiplier... That means thermal loss is the same but the theortical speed should improve for basic CPU function, and also GPU, if a bottle neck is not present... I found at this clock it wasn't, but a rise to 4.16 resulted in very little gain in CPU throughput, and thus virtualy no gain in base CPU function. Heat generation, however, begins to become a little uncomfortable for my tastes when stressed 100% and it really only made the slightest difference in testing, so I opted for the more efficient higher frequency tune... But I thought the 200x20 worked well also.

If I had a 875K I would be trying 50 multiplyers if I could... I think it'd pull 90-95Mhz around there... low voltage to boot... Saw one guy workin a 36 multiplier or something like that... 1.37V I think it was...4.5Ghz... kickin it SNB style!thumb.gif


And YES, I would look at CPU physics benchmarks for degradation of CPU computational power, or any other sort of more direct test would be required, not FPS in general. That would lead me to believe a GFX problem was developing.
Edited by gtfoxy - 2/14/12 at 8:37pm
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