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Noinoi
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Would better cooling help with high-frequency stability at the same voltage or lower?

Sat Dec 15, 2018 9:25 am

After lots of wrangling in BIOS settings, I've managed to eke out a fully stable 4.9 GHz at 1.37V on a 9600K. The temperatures are quite high, though - it averaged 90 degrees Celsius. At least there's no thermal throttling, but now I'm wondering if a significantly better cooler than an aging H60 - a carryover from my Haswell setup - might increase frequency headroom at the same or similar voltages.
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Krogoth
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Re: Would better cooling help with high-frequency stability at the same voltage or lower?

Sat Dec 15, 2018 9:53 am

Coffee Lake R/Coffee Lake are going to be toasty when fully loaded. There's just too much thermal density. You need high-end cooling/exotic cooling if you want 70C or below when fully loaded. Air-cooling is just not quick enough. Intel never intended on using 14nm for six and eight-core chips on a mainstream SKUs or wanted 14nm silicon to operate at such high clockspeeds. There's a reason why Skylake-X LCC and Skylake-X HCC never had such high clockspeeds when fully loaded.

Coffee Lake and Coffee Lake R are just a stopgap designed to beat the Ryzen/Ryzen+. No matter the cost. They are totally a throwback to Pentium 4 Extreme Edition chips and its lesser siblings back when K8s were providing serious competition in the desktop market.

FYI, My current 9700K climbs up to 90C+ at stock if I were to use MCE and don't touch AVX offset with a Noctua NH-U9S (using two 92nm fans) under Prime95/Linpack stress tests. AVX offset of 2 and 3 only manages to tame the chip to 80-84C under the same tests. Under my normal workloads, it barely goes above 60C.
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Noinoi
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Re: Would better cooling help with high-frequency stability at the same voltage or lower?

Sat Dec 15, 2018 11:34 am

Hmm... seems like I might have possibly mucked up a few things along the way, since the system appears to be sufficiently stable at 1.30V now that I've reset the BIOS settings and reconfigured the overclock. A 82C average is far more acceptable. There still won't be enough thermal headroom for 5GHz, though, as is - it kept crashing out even at 1.38V and I don't feel like going with even more juice with the current cooling due to very high temps past 1.37V.

No comment on the Coffee Lake opinion, though.
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JustAnEngineer
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Re: Would better cooling help with high-frequency stability at the same voltage or lower?

Sat Dec 15, 2018 11:51 am

The new Core i7-9700K is pushing my H100i v2 to its limit. I'm considering swapping it out for a NH-D15 with third fan that I have available.
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cegras
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Re: Would better cooling help with high-frequency stability at the same voltage or lower?

Sat Dec 15, 2018 12:10 pm

Silly question, is 4.9 Ghz your all-core turbo? My six core multiplier is 46x and I'm wondering if I can push it further.
 
TwistedKestrel
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Re: Would better cooling help with high-frequency stability at the same voltage or lower?

Sat Dec 15, 2018 2:28 pm

To answer the premise of your original question -

Yes. Power consumption rises with temperature, this is more easily measurable/noticeable with GPU overclocking. The degree to which it would help in your case, I can't tell you. Taking a look at this --> https://www.anandtech.com/show/13400/in ... -review/21 may help you figure out how much heat disappation you should be looking for.

It should be easy to do better than an H60, though. If you already bought a 9600K you shouldn't need too much of an excuse to spring for a good 240mm/280mm cooler
 
Noinoi
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Re: Would better cooling help with high-frequency stability at the same voltage or lower?

Sun Dec 16, 2018 5:39 am

cegras wrote:
Silly question, is 4.9 Ghz your all-core turbo? My six core multiplier is 46x and I'm wondering if I can push it further.


Yeaqh, 4.9 GHz for all six cores. Uncore ratio is still at 43x, though I've been increasing it in steps as of today. Also, I'm now running it at 1.31V due to an unexpected crash during a 3DMark stress test - though I might dial it back to 1.30V because then I found that the video card's no longer holding my old OC stably.

TwistedKestrel wrote:
It should be easy to do better than an H60, though. If you already bought a 9600K you shouldn't need too much of an excuse to spring for a good 240mm/280mm cooler


I'm thinking of foregoing anything involving liquids and hoses, to be honest, but if a 240/280mm cooler works even better... I'm all ears.

Been planning to get a new cooler anyway - this H60 is tiding me over. Surprisingly it managed 4.9 GHz.
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Re: Would better cooling help with high-frequency stability at the same voltage or lower?

Sun Dec 16, 2018 10:55 am

Only posting this because it's the most recent HSF review on H/OCP so it has up to date info. https://www.hardocp.com/article/2018/12 ... r_review/3

Of course a huge radiator with 2+ fans is going to cool better than most air coolers. Just physics. The H100 and up from Corsair look to be pretty good performers at the top, even if they do get a little loud at times. Something like the H115i looks to be right up at the top.
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