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The Gigabyte Z87/Haswell Overclocking(OC) Guide - Page 137

post #1361 of 3243
have a read of this thread dude, a few guys have posted their setting in here already smile.gif
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post #1362 of 3243

My 4770k booted into Windows once at 5GHz. I got a screenshot of it showing 5000.05 MHz, but CPU-Z came back with 4999.96 MHz. But that wasn't at all stable, just a trophy run that I have not repeated.

 

I had it stable at 4.7GHz running the original LinX. Then I imported Linpack 10 into LinX. Linpack 10 uses the AVX codes. Oops. Too hot. Throttling. Cut back my OC.

 

Then I tried running LinX with Linpack 11. It would run one rep, then stop. I then ran Linpack from a bat file. I noticed that Linpack wasn't using all 8 threads all the time. I asked on the AT forum, got some links, and learned that HT can confuse Linpack, reduce the results. So I turned off HT and ran Linpack. The AVX2 really cooked the chip. So now I'm running 4.3GHz.

 

While my silicon looks to be an OK chip, the interface with its IHS looks to be bad. As best I can tell, up to a certain level of heat production, the TIM can keep up and the core temps are OK. When heat production exceeds the capacity of the TIM to pass it along, core temps start to climb. In my cpu, the core temps skyrocket; they jump up very quickly.

 

Interesting: the air coming off my NH-D14 was only lukewarm, even when core temps were 98-100c. When the same heatsink is attached to my i7 860, when the cpu is loaded -- especially at 4GHz -- the D14 feels like a hair dryer. The core temps were in the 70's.

 

At a certain level of heat production, the ihs surrounding my cpu becomes more like a thermos bottle than an ihs. So, unless I delid my cpu I am thermally limited, not stability limited.

 

And that level of heat production does not need a D14 to dissipate it, so I use an Armageddon instead.

 

Because an app may use AVX2 without my being aware of it, it could ambush me. So I keep my rig set up for the worst case scenario -- 4.3GHz.


Edited by ehume - 9/22/13 at 8:55am
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post #1363 of 3243
Quote:
Originally Posted by Aldushi View Post

And what's this CLU everyone is talking about?

It is Coollaboratory Liquid Ultra (and Pro) a liquid metal TIM.

http://www.frozencpu.com/products/10740/thr-77/Coollaboratory_Liquid_Ultra_100_Metal_Thermal_Interface_Material.html
post #1364 of 3243
Quote:
Because an app may use AVX2 without my being aware of it, it could ambush me. So I keep my rig set up for the worst case scenario -- 4.3GHz

Nothing will draw crazy amounts of power unless it's an FPU stress test. Real world uses of avx2 like x264 draw like the same power as linpack without avx - or even slightly less, we're talking like 100w reported at 1.3v, while avx1 fpu stress tests are at like 140+ and avx2 is in the stratosphere
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post #1365 of 3243
Quote:
Originally Posted by ehume View Post

My 4770k booted into Windows once at 5GHz. I got a screenshot of it showing 5000.05 MHz, but CPU-Z came back with 4999.96 MHz. But that wasn't at all stable, just a trophy run that I have not repeated.

I had it stable at 4.7GHz running the original LinX. Then I imported Linpack 10 into LinX. Linpack 10 uses the AVX codes. Oops. Too hot. Throttling. Cut back my OC.

Then I tried running LinX with Linpack 11. It would run one rep, then stop. I then ran Linpack from a bat file. I noticed that Linpack wasn't using all 8 threads all the time. I asked on the AT forum, got some links, and learned that HT can confuse Linpack, reduce the results. So I turned off HT and ran Linpack. The AVX2 really cooked the chip. So now I'm running 4.3GHz.

While my silicon looks to be an OK chip, the interface with its IHS looks to be bad. As best I can tell, up to a certain level of heat production, the TIM can keep up and the core temps are OK. When heat production exceeds the capacity of the TIM to pass it along, core temps start to climb. In my cpu, the core temps skyrocket; they jump up very quickly.

Interesting: the air coming off my NH-D14 was only lukewarm, even when core temps were 98-100c. When the same heatsink is attached to my i7 860, when the cpu is loaded -- especially at 4GHz -- the D14 feels like a hair dryer. The core temps were in the 70's.

At a certain level of heat production, the ihs surrounding my cpu becomes more like a thermos bottle than an ihs. So, unless I delid my cpu I am thermally limited, not stability limited.

And that level of heat production does not need a D14 to dissipate it, so I use an Armageddon instead.

Because an app may use AVX2 without my being aware of it, it could ambush me. So I keep my rig set up for the worst case scenario -- 4.3GHz.

this is the reason i now i have about £200 worth of water cooling on order. even the best air can not keep haswell cool enough to push the clocks to their limits.

much like you i have the option of running 4.2ghz (with 4.2 uncore) or if i drop the uncore i can up the cores to 4.4ghz with the uncore only on 4ghz and this lets me drop the volts enough to keep it cool.

i have also done some comparisons of my aircoolers, d14 is about 5/6c worse at full load than the ifx14 with the same fan config.
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post #1366 of 3243
marsey99 you could always delide the CPU and use the D14 instead of spending 200£ on a WC system that will be 5 to 10ºc better
post #1367 of 3243
d14 is worse than the ifx14 dude, but both are far too heavy to hang off it when i remove the hs. if i was going to stay air i would get a silver arrow sb e as they are the best air money can buy but even that isnt much better than the air i already have.

thinking i will delid it when i can use the water block and not 1.5Kg of copper block and then think about getting the ek precision mount to run it bare later.

edit

as said the issue is how effective at removing the heat quickly from these cores and in my opinion air coolers just aint effective enough for anybody wanting to push the clocks high.

i am hoping water will be able to move that heat away a little bit faster and in turn allow me to run it on more v and at a faster speed smile.gif
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post #1368 of 3243
Quote:
Originally Posted by ikjadoon View Post



The stock VID is 1.088V after Optimized Defaults and 1.150V after enabling XMP (no idea why, but the stock VID changes after I enable XMP). Here are my results, cooled with a Noctua NH-U14S (slightly worse, equal to, or slightly better than a NH-D14, if that helps):



As a summary, 4.2GHz @ 1.275 is the highest stable I can get it and that's only testing with Prime95. 4.4GHz @ 1.350 crashed within a few minutes and 4.3GHz @ 1.300 crashed in 45 minutes while hitting upper 80's regularly (so afraid to try 4.3GHz @ 1.350). I haven't changed any other settings than the Vcore, VRIN, VRING, multi, and uncore--do I need to be changing any others? Like the Turbo power limit or what-not? Sin's profiles list "Turbo" as auto, so probably not. Right?

And those temps look normal, right? It's an i5-4670K, not delidded. I had a little trouble getting the cooler on, but the temps don't look terrible for those voltages, right?

Friendly bump--sorry if you have no idea and don't want to see my bad meme again, lol. frown.gif I haven't missed anything obvious, right?
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post #1369 of 3243
cant you do 4.2 at 1.2v, high volts for low clock my chip can do 5.5ghz with 1.45v with the right cooling
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post #1370 of 3243
Quote:
Originally Posted by Rbby258 View Post

cant you do 4.2 at 1.2v, high volts for low clock my chip can do 5.5ghz with 1.45v with the right cooling

Thank you for the reply! smile.gif Right, I haven't looked for the lowest voltage yet. Good reminder that I should bump that down.

But, would you agree that 4.2GHz is the safe 24/7 frequency max?
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