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post #1 of 9 (permalink) Old 01-11-2020, 04:24 PM - Thread Starter
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Is it possible to disable cores?

Can you disable bum cores and would doing so increase the overclocking headroom on good cores? Or is it possible to downclock bum cores?

I'm interested in doing this to test GTAIV and see if cranking up three or four cores out of the 8 on my 9700k will result in more performance.
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post #2 of 9 (permalink) Old 01-11-2020, 04:28 PM
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have you never been inside your BIOS before? lol

Windows is still going to assign whatever load it wants to whatever core basically willy nilly so the benefit of clocking 1-6 cores 100-200mhz higher is minimal, even setting affinity manually the gain is going to be tiny. Outside benchmarks I'd be surprised if you could tell a difference.

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post #3 of 9 (permalink) Old 01-11-2020, 05:01 PM
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On Z390, you can reduce the total # of cores (at least, you can with an EVGA Dark) but you can't actually pick which cores get disabled.

X299, interestingly, can do that, ex. I can cut my 7980XE down to the 4 best/coolest cores to push OC for single thread benchmarks

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post #4 of 9 (permalink) Old 01-11-2020, 05:21 PM
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Quote: Originally Posted by The Pook View Post
have you never been inside your BIOS before? lol

Windows is still going to assign whatever load it wants to whatever core basically willy nilly so the benefit of clocking 1-6 cores 100-200mhz higher is minimal, even setting affinity manually the gain is going to be tiny. Outside benchmarks I'd be surprised if you could tell a difference.

It actually does a really good job of assigning loads to the best cores. In win10 atleast.
I can go into HW monitor and look at the averaged clock speed of all the cores.
Basically thats going to tell you what cores are doing the most work because there average clock speed will be higher.

The 4 best cores have a much higher average clock speed since they are the ones getting loaded up all the time. 2.1ghz
And funny enough the worst rated core has average clock speed of what the idle clock is. 1101mhz
While the rest are 1600-1800mhz


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post #5 of 9 (permalink) Old 01-11-2020, 05:30 PM
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this is typically a bios function.

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post #6 of 9 (permalink) Old 01-12-2020, 12:12 AM - Thread Starter
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Quote: Originally Posted by Hydroplane View Post
On Z390, you can reduce the total # of cores (at least, you can with an EVGA Dark) but you can't actually pick which cores get disabled.

X299, interestingly, can do that, ex. I can cut my 7980XE down to the 4 best/coolest cores to push OC for single thread benchmarks
This is exactly what I was interested in doing. How much farther can you push the best/coolest 4 cores when the others are disabled?
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post #7 of 9 (permalink) Old 01-20-2020, 04:05 PM
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Quote: Originally Posted by 8051 View Post
This is exactly what I was interested in doing. How much farther can you push the best/coolest 4 cores when the others are disabled?
A little late (haven't been on in a while) but my 7980XE runs at 4.3 on 18/36 and up to 5.0 on 4/4

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post #8 of 9 (permalink) Old 01-22-2020, 08:11 PM - Thread Starter
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Quote: Originally Posted by Hydroplane View Post
A little late (haven't been on in a while) but my 7980XE runs at 4.3 on 18/36 and up to 5.0 on 4/4
Thanks. That's great. What kind of overclocked frequencies could you get with say, 8/8 enabled, 8/16 or maybe 6/12? It could be like a 9700k, 9900k or 8700k but with 4 memory channels and more L3 cache to keep the cores fed w/data and a full 44 PCIe 3.0 lanes. An exxxxxxpensive processor but at least its flexible.

Do AMD's top end ryzens or threadrippers allow for selectively enabling the highest overclocking cores?
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post #9 of 9 (permalink) Old 01-22-2020, 08:27 PM
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Quote: Originally Posted by 8051 View Post
Can you disable bum cores and would doing so increase the overclocking headroom on good cores? Or is it possible to downclock bum cores?

I'm interested in doing this to test GTAIV and see if cranking up three or four cores out of the 8 on my 9700k will result in more performance.
Even though you can't disable bum cores, removing cores reduces temperatures significantly and also seems to reduce vdroop. With 3 cores at 5.55ghz/1.4v on my 9900k, I had load temps around 55c. That leads to a significant reduction in voltage compared to what 8 cores at 5.55ghz would require.

I have also tested turboboost ratio overclocking and have managed 5.4ghz in normal ambient conditions with a chip that does 5ghz at 1.34v Prime95 AVX2 stable. Source: https://old.reddit.com/r/overclockin...ily_overclock/

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