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Intel K Club & Discussion - Page 37

post #361 of 560
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Quote:
Originally Posted by Ghostleader View Post
I always start to test LinX in diagnostic mode because it does less damage if it freeze at Windows start and after multiple BSOD and it´s also less services that can interupt.

My goal is to have less then +-0,15 in fluctuation between the runs, if it´s more, it´s usually to low vcore or not the right Clock skew, for example, if I use auto clock skew at Bclk 200 the fluctuations is more but if I set the clock skew at delay 100ps for CPU clock skew and normal for PCH clock skew the fluctuations is less.

How this works my varies between different brand, board and chip, for example my Evga P55 FTW do a double post before it starts and that´s Evga´s way to try set the right clock skew automaticly between the CPU and the PCH.

One have do a lot of trail and error with ones gear to find what´s working the best.

Hope it helped some








Low VTT voltage have very little to do with what CPU frequency one run, it´s more about how high UnCore frequency one run, with a lower Bclk one got lower UnCore and that put less stress on the IMC even though one might run 1600+ on the ram, less stress on the IMC, less voltage to feed it.

If I run Bclk of 133, UnCore 2400, CPU ~4000 and ram at 1600C7 I can run IMC voltage at ~1,15 but when I start to rise the Bclk the UnCore rises to and I have to follow with the voltage even though I try to stay with the same ram frequency, so there´s nothing magic about it, in my opinion it´s pretty normal.



ehume, there´s something that´s not right with your LinX run at Bclk at 167, the fluctuations is way to big, maybe something in the background that interfere or to low vcore.
So you think that if linx is more than 1.0 off in runs it isn't stable? I've always assumed that if it wasn't more than 1.0 off it was fine?

@skfurr: Those temps are dangerous. I would keep your max below 80C.

@Ransom: Fixed .
post #362 of 560
Quote:
Originally Posted by cory1234 View Post
@skfurr: Those temps are dangerous. I would keep your max below 80C
cory1234:
With the side cover off, I never get above 78C. That typifies a case exhaust problem, no? IOW, with the side off the heat just goes out the side where with the cover on it is trapped inside and runs hotter until it reaches equilibrium (some heat generated is absorbed by the case and some escapes out through the vents but delta inside vs outside air is muy grande?)

Most recently I swapped the CPU in a Thinkpad T61p from a Core2Duo (2.4GHz, 35w thermal envelope) to a Core2Extreme 7900 (2.8 GHz, 44w thermal envelope.) To keep it stable I had to use RMClock to underclock the CPU as much as possible, and use TPfanctr to run the fan at higher speeds than what the BIOS normally would do. It took a while but I eventually got it to stay under 85C during prime95.

Isn't this sort of the same situation with the exception of the heatsink/fan not being right up against an external vent? So more airflow on the 875K system specifically to get the cold air in and the hot air out would make a big difference?

Finally, what's the chance that I munged up the Tt Frio <--> Arctic Silver <--> 875K thermal connection? I dabbed on the Arctic and used a credit card to spread it paper thin then installed the Frio careful to torque it down evenly. I'd think that if I had a bad thermal conductivity issue there I'd see a lot more CPU reported heat...

Thanks,

Stephen
    
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post #363 of 560
Quote:
Originally Posted by skfurr View Post
cory1234:
With the side cover off, I never get above 78C. That typifies a case exhaust problem, no? IOW, with the side off the heat just goes out the side where with the cover on it is trapped inside and runs hotter until it reaches equilibrium (some heat generated is absorbed by the case and some escapes out through the vents but delta inside vs outside air is muy grande?)

Most recently I swapped the CPU in a Thinkpad T61p from a Core2Duo (2.4GHz, 35w thermal envelope) to a Core2Extreme 7900 (2.8 GHz, 44w thermal envelope.) To keep it stable I had to use RMClock to underclock the CPU as much as possible, and use TPfanctr to run the fan at higher speeds than what the BIOS normally would do. It took a while but I eventually got it to stay under 85C during prime95.

Isn't this sort of the same situation with the exception of the heatsink/fan not being right up against an external vent? So more airflow on the 875K system specifically to get the cold air in and the hot air out would make a big difference?

Finally, what's the chance that I munged up the Tt Frio <--> Arctic Silver <--> 875K thermal connection? I dabbed on the Arctic and used a credit card to spread it paper thin then installed the Frio careful to torque it down evenly. I'd think that if I had a bad thermal conductivity issue there I'd see a lot more CPU reported heat...

Thanks,

Stephen
i upgraded my exhaust fan to a 120mm 76.8 cfm 2krpm (very loud) and with the noise put aside it dropped my cpu temps considerably. the rear exhaust fan imo is the second most important fan in a system. i never realized that before i upgraded mine and got over a 5 degree c all around drop in temps.
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post #364 of 560
whoa...so many post on here all of a sudden...lol
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post #365 of 560
i can't even keep track of this thread anymore...but it has a lot of good stuff on the chip buried in it somewhere
post #366 of 560
Quote:
Originally Posted by SOCOM_HERO View Post
i can't even keep track of this thread anymore...but it has a lot of good stuff on the chip buried in it somewhere
My bad for highjacking this and getting so far OT.

Stephen
    
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post #367 of 560
Quote:
Originally Posted by skfurr View Post
My bad for highjacking this and getting so far OT.

Stephen
I meant no harm to anyone specific, I'm just saying the thread was dead for a while and now it seems a lot more people have questions about the chip...keep em coming!

PS...Welcome to OCN! It might help us more if you fill out a system profile by clicking on edit system in USER CP
post #368 of 560
Quote:
Originally Posted by SOCOM_HERO View Post
I meant no harm to anyone specific, I'm just saying the thread was dead for a while and now it seems a lot more people have questions about the chip...keep em coming!

PS...Welcome to OCN! It might help us more if you fill out a system profile by clicking on edit system in USER CP
From my favorite movie:

"He can't make that kind of decision; he's just a grunt! No offense?" - Burke

"None taken." - Cpl Hicks



Profile updated and system details entered.

Thanks for the welcome; OCN is a wealth of knowledge.
    
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post #369 of 560
I believe the answer is "all." It does make the whole process of tweaking very slow when you have 16GB of RAM though: each pass is right around 20 minutes x 20 passes and you have nearly 7 hours of testing.

My last run finished 17/20 runs before BSoD with 0x00000124.

Upped the Vcore one notch and started again...

I know the goal here is to get 100% stable, and I agree with it. I'm just wondering when I'll ever be running something (in real life) that takes all four cores to 100% for 7 hours at a time.

[Requisite 875K content]

So step 1 was to disable Intel Turbo Boost... Sound right? I want all four cores running at the same speed all the time.

Step 2 was to disable C1E and C3/6 so that the CPU doesn't muck with the clock or voltages on its own.

Step 3 is to disable EIST? I don't think this one is necessary as EIST seems to faithfully follow whatever power policy you've put together in Windows. ie. if your minimum and maximum CPU is listed at 100% in Windows then the CPU clock doesn't seem to change. If you set it to be 50% minimum and 100% maximum then SpeedStep will drop the multiplier accordingly based on load.

Any suggestions or advice?

[/Requisite 875K content]
    
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post #370 of 560
Disable TB? The whole point of getting an 875k for me was to run with TB and all the bells and whistles enabled. So:

I had my cpu voltage (Vcore) set to Normal. I ran LinX and noted that the Vcore reported by ET6 and CPU-Z was 1.312V, which was the low end of the Vcore at load when I ran my i7 860 with Vcore set to 1.31250v.

But LinX was not stable at Vcore = 1.312v. I recalled that the higher voltage on load with my 860 was 1.328v. Hmm. 1.3280v - 1.3125 = 0.0155v. The closest setting in BIOS is Normal + 0.0125v, so I set it to that. In theory, 1.31250v + 0.0125v should = 1.325v, but when I run LinX I now get Vcore = 1.328v, which is just fine.

Even better: LLC, HT and TB are all enabled. Ditto EIST, C1E and the other C-states. My whole Voltage page is Enabled. The 875k runs from 134x9 to 134x30, depending on the load. This is exactly what I wanted.

If I can do this with a P55A-UD3P, you can do this with a -UD4P. Just remember to go into Power Option and set High Performance > advanced > Processor Power Management > Minimum processor state to 5% or so.
Edited by ehume - 10/4/10 at 5:01pm
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