New challenge: OC of Xeon on a Asus board with 2× LGA 3647

We need coolers for a new socket

This summer, Intel and AMD introduced processors with significantly higher power consumption and heat output: Threadripper with 180W TDP and Skylake-X that does not fall behind. After OC, both can consume over 300W (and Core i9-7980XE even more). These are new challenges for cooling, but maybe they are not the final “boss”. It looks like OC possibilities will now open for the latest generation of Xeon servers with 28 cores.

Asus has revealed WS C621E Sage boards for Xeon – LGA 3647 socket (those with the current Skylake server architecture with AVX-512), and promises to allow overclocking of these processors. And it’s even a board with two sockets, so we’re talking about overclocking of extremes such as Xeon Platinum 8180 with 28 cores and TDP 205 W (10,000 $). Or Xeon Platinum 8160 (24 cores) for 4700 $, or Xeon Gold 6138 for $ 2460. There are many interesting choices.

How exactly Asus managed to make OC possible here has not been revealed yet. Web mentions only that OC of Xeon will be available. The most likely thing is that it works via a turbo, that is, the CPU can be forced to use all the cores constantly at the maximum boost, normally allowed only when a small number of cores is working. Or maybe it will be done by increasing BCLK.

The potential performance of your computer could be really high. But it will be also interesting in terms of consumption and cooling. The chips that Intel puts to Xeons should have better energy efficiency. It is assumed that these are less heating pieces with lower leakage, while the worse go to Core i9. But after overclocking, a big increase in consumption can be expected anyway. Cooling Xeons with the highest number of cores will be probably quite challenging, plus you will have to take care of two pieces side by side. And also two power supply circuits – 7+1 phases under the heatsink that is not so big. Perhaps they will have to be cooled actively after OC. It will all depend on motherboard limits.

Asus WS C621E Sage for two Xeons (generation Skylake-SP). They are installed in the LGA 3647 socket as in servers

LGA 3647

There is another complication: Intel uses a different socket for these CPU than LGA 2066 for desktops. LGA 3647 is much larger and has a completely different cooler mounting. You cannot use any existing cooler with Xeon Gold/Platinum processors which have an IHS that is considerably bigger. For playing with this expensive platform, it will be necessary to acquire a cooler used in servers, improvise some custom mounting, or wait for something from cooler manufacturers.

Server cooler for LGA 3647: Supermicro SNK-P0070APS4

The situation is quite similar to the one with the Threadripper. There were some special coolers for it. A relatively easy but not optimal solution is to use a simple clamp for extended Asetek liquid coolers with closed circuit – maybe even Asus will add some to their board. Perhaps the best solution here is a water monoblock that would be shaped exactly for this board and socket. It should have one critical advantage – the ability to effectively cool the power supply circuit. Perhaps there is someone who can make it.

We do not know yet when the board will be available on the market. Asus has not announced a price, but it will be surely high. After all, it is meant for customers who have several thousand dollars/euros for two Xeons Gold or Platinum.


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  1. HWBOT WORLD RECORDS ~ Slinky PC LGA 3647 2x8180m full cooling https://www.ebay.com/itm/222983689263
    wPrime – 1024m; 20sec 984ms
    Cinebench – R11.5; 81 points
    Cinebench – R15; 8830 cb
    GPUPI for CPU – 1B; 57sec 766ms
    HWBOT x265 Benchmark – 1080p; 258.391 fps
    HWBOT x265 Benchmark – 4k; 67.391 fps
    Y-Cruncher – Pi-25m; 0sec 473ms
    Y-Cruncher – Pi-1b; 14sec 741ms
    Y-Cruncher – Pi-10b; 2min 54sec 831ms (2x8180m @5232MKz)
    HWBOT 8180m http://hwbot.org/hardware/processor/xeon_platinum_8180m/

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