Overclocker der8auer tears a hole in Skylake-X overclocking rumours

Overclocker der8auer tears a hole in Skylake-X overclocking rumours

| Source: Der8auer - YouTube Author: Mark Campbell

Overclocker der8auer tears a hole in Skylake-X overclocking rumours

The overclocker der8auer has torn a hole in recent X299 Skylake-X overclocking rumours by showing a 5GHz overclock on a Corsair 280mm AIO liquid cooler, estimating that the average chip will reach 4.7GHz after delidding.

This has invalidated early rumours that Intel's Skylake-X CPUs would only be able to run at clocks of 4.2 to 4.4GHz, similar overclocks to their Broadwell-E counterparts. One thing to note though is that even after delliding on a cherry-picked i9 7900X did hit around 88-degrees on Corsair's 280mm AIO cooler, so don't expect Skylake-X CPUs to run cool and quiet when overclocked.

Below is a transcript of what der8auer said in his latest X299 video. Special thanks to The Fear Channel on the OC3D Forums for taking the time ti write this all down.



From my point of view Skylake-X is a pretty impressive CPU. We now have have a 10-core that's a lot cheaper than the Broadwell-E before and it clocks a lot higher. Even with the stock Intel paste I was able to reach 4.8 GHz on the CPU (i9-7900X) using Corsair 280 (mm) AIO. So there is still some headroom, I guess if you use a custom new water cooling you might be able to hit 4.9 GHz on a very very good chip without delidding. So after this test I delidded the CPU and replaced the stock TIM with liquid metal and this helped me push the CPU with an AIO to 5 GHz.



So we had Broadwell-E before who could run like 4.3-4.4 GHz, it cost 1700€. Now we have Skylake-X which is a lot cheaper and we CAN push it to 5 GHz, so what's all this negative press about? I don't really understand it. So from my point of view this is a very impressive CPU, so we have very high single-thread performance on the 10-core and also high MT performance, which we didn't have before in a Broadwell-E (probably comparing to mainstream).



...I think you can maybe hit 5.1 GHz on a custom water cooling loop if you have a very very good chip. Keep in mind that this chip was already pre-tested so it's already a really good CPU. On average CPU you might be able to get 4.7-4.8 GHz if you delidded it and on a pre tested CPU 5 GHz should be possible.





This data mean that Intel's higher core count X299 CPUs will likely require custom liquid cooling setups to maintain high overclocks, as even while delidded the i9 7900X is almost at its thermal limits on Corsair's 280mm AIO cooling solution. How hot will an overclocked 18-core system be?

One other thing to note is that der8auer stated that his 5GHz overclock was non-AVX stable, which means that end-users will likely need to set a custom AVX clock speed profile to lower the CPU's clock speed slightly under AVX loads. This is a common feature on Intel's most recent motherboard platforms.

If der8auer's estimates are to be believed than X299 Skylake-X CPUs will offer similar overclocks to their Skylake-S Z170 counterparts, which should allow most people to overclock from 4.5GHz to 4.8GHz depending on their cooling solution and the performance of their particular CPU.



You can join the discussion on Intel's X299 Skylake-X overclocking ability on the OC3D Forums.

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