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Yancar
Journeyman III

7900X3D Cores parking odd?

Good day, 

 I built a new PC and decided to go with a 7900X3D. I have always been an intel guy my whole life (and honestly still love their products) but when I started researching some good modern CPU's I came across the 3D V cache chips and knew I had to try it out. Long story short I struggled to get the cores to park for about 5 weeks.. following many guides and mixing opinions and installing windows 11 fresh. I was about to give up. However yesterday I booted up my PC and I booted up RUST and to my amazement (no idea what I did, the PC sat powerless for about 2 days) the cores are parking,all 6 of them. However cores 1, 2 , 3, 4 are running 5, 6(v cache cores) are parked 7,8 are running and 9, 10, 11, 12 are also parked(frequency cores). I was under the impression that the frequency cores park and v cache don't? The performance is night and day once the cores did park, however I am wondering why 2 of my v cache cores are parked? And not the frequency cores? Is this normal? I see other people out there reporting this same kind of behavior. Can someone shed some light? Much appreciated and great thanks in advance. 

 

Cheers my friends.

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8 Replies
Yancar
Journeyman III

Bump

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Yancar, there is no core parking in AMD. I think that is an Intel term. You turn can turn cores on/off with Ryzen Master (RM). Please install RM, click Help in the lower left and read about disabling cores. Enjoy, John.

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The 7900X3D and 7950X3D do have a gaming feature that parks the CCD1 cores without vCache so that only CCD0 cores with vCache are used for the game. This is AMD's way to avoid cross-CCD latency as only CCD0 has the extra vCache.

Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT
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OK.

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Not true

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FunkZ
Paragon

Please see this AMD X3D Setup Guide.

In addition to the BIOS and Chipset Driver updates, make sure Game Mode is enabled and Xbox Game Bar App is installed.

The game has to be recognized as a game by the system in order to park the non-vCache cores so that the game takes advantage of only the vCache cores without cross-CCD latency.

Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT
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Rather than parking the cores on CCD1, I suggest you use Process Lasso to force all non-game processes onto CCD1 and all game processes onto CCD0. This should produce even better performance.

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ed6698
Adept III

There looks to be some type of core parking with AMD, this is with Windows 11 core 16 thru 31 are parked with my 5950x. The entire CCD with core 16 to 31 are parked on my cpu. When the entire CCD is parked the cores on the other boost higher.

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Asus ROG Crosshair VIII Dark Hero - Ryzen 5950X - Noctua NH D15 Chromax Black - 4x8GB 32Gb GSkill DDR4 @3800 - Asus RTX 3070 TUF OC V2 - Samsung 980 Pro, 970 Evo Plus, Corsair Force GT - Super Flower 1000W Leadex SE Platinum
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