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AMD Ryzen 7 9800X3D

Well that's my mind made up. 9950x3d it is. Dual CCD to replace a dual CCD. Thanks for 'making' me spend more money :)
 
GoogalyMoogaly said:
I'm just going off what @LtMatt said back during 7950X3D and 7800X3D release.
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It absolutely was a thing, it was well documented inside and outside of AMD. If you go back and look at Gamers Nexus launch review of the 7800X3D, it was mentioned there by AMD as a known issue. However, it did get fixed sometime back (Can't recall exactly but I'll say in the region of 3-6 months back) via a silent OS update. That update meant that you could move between parts and not get a performance penalty, therefore no longer having to reinstall the OS for optimal performance. It's a good thing as it was far from ideal tbf. Sometime back, BIOS options were introduced to allow control over this functionality (forcing workloads to one CCD) in the BIOS, but that always required a system restart so the software solution was preferred, if not a bit more prone to potential issues relating to other software such as the OS/Gamebar/Chipset etc.
 
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LtMatt said:
It absolutely was a thing, it was well documented inside and outside of AMD. If you go back and look at Gamers Nexus launch review of the 7800X3D, it was mentioned there by AMD as a known issue. However, it did get fixed sometime back (Can't recall exactly but I'll say in the region of 3-6 months back) via a silent OS update. That update meant that you could move between parts and not get a performance penalty, therefore no longer having to reinstall the OS for optimal performance. It's a good thing as it was far from ideal tbf. Sometime back, BIOS options were introduced to allow control over this functionality (forcing workloads to one CCD) in the BIOS, but that always required a system restart so the software solution was preferred, if not a bit more prone to potential issues relating to other software such as the OS/Gamebar/Chipset etc.
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That sounds right to my recollection.

There were two sorts of errors as far as I know:

- when moving from 1 CDD to 2 CDDs, the CPU wouldn’t properly park the cores on the second CDD in games causing cross CDD usage and a loss of efficiency.

- when moving from 2 CDDs to 1 CDD, you ended up with half the CDDs on your single CDD being parked (which is what happened to Gamers Nexus as per the vid I posted). Even though they did everything by the book, they still had issues.

Both issues aren’t (or at least weren’t) necessarily fixed by just enabling / disabling the multi-CCD functionality in the BIOS… so if you’re not not doing a fresh windows install, I’d pay close attention to all of your cores to make sure they are doing exactly what you expect.

As said, hopefully now resolved but it was an issue for some time.
 
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