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Replaced a water cooler with a traditional heatsink as a precautionary measure. I've been using this AMD Threadripper 3990X 64-core CPU for two years, and I really liked it! I'll probably use it for at least two more years.

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what kind of air cooler can handle this for instance? Will a regular consumer-grade chunk like NH-D15 do?

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I bought this:

Noctua NH-U14S TR4-SP3, Premium-Grade CPU Cooler for AMD sTRX4/TR4/SP3 (140mm, Brown)

Continuing the legacy of Noctua’s classic NH-U-series, which has received more than a thousand awards and recommendations from international hardware websites and magazines, the NH-U14S has become a...

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i wonder why they don't have 15 models for threadripper socket. Is it that the surface is so large that it cools better?

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They have relative performance numbers at noctua.at/en/products/cp based on their Noctua Standardised Performance Rating (NSPR). NH-D15 is one of the oldest designs in their current product line and desperately needs an update. It's still their highest performance cooler though.

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NH-U12A has NSPR 169 which is really close to NH-D15 183 because it has their newer heatsink and fan designs. They only made a single Threadripper cooler because it's a tiny market. You can see they don't list it as having maximum turbo perf for 64 core: ncc.noctua.at/cpus/model/AMD

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i use u12a. Didn't know d15 was an old model but just the balance of the size and the performance seemed to hit the diminishing return point at u12a.(and reviews seem to show that 169 and 183 are more like 179 and 183; no difference)

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The NH-U12A has 7 heatpipes compared to the much larger NH-D15 having 6. I think it would have at least 9 heatpipes with the new design. Those new 120mm fans are also so much better than the old ones. The new 140mm fans are going to be amazing. Has been so delayed though.

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For me, u12a is doing more than i ever need it to do atm. If I need better cooling in the future, I'm thinking of doing a custom loop for the first time.

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It's less than ideal with a 64 core Threadripper, PBO enabled 32 core Threadripper or PBO enabled Ryzen 5950X (16 core) where clock speeds get held back by heat. I'd like to get the next gen NH-D15 for either 64 core Zen 3 Threadripper or a 24 core Zen 4 desktop CPU build.

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Threadripper cores are very spread out across a huge die so the coolers are far away from maxing out heat dissipation and their turbo is heavily heat limited, particularly if you turn on PBO which raises the turbo power limits to the motherboard reported ones.

8:21 PM · Aug 17, 2022Twitter Web App

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Also, a nice thing about the 140mm fans is that they'll be quieter than providing the same heat dissipation with 120mm fans. Their new 120mm fans are so much more advanced than the old designs that they're almost as good as the current 140mm fans. It's a bit odd right now.