Question Has Anyone Tested the Ryzen 5 7600 With Dual CCDs?? (Which Should Be Slower)

[TechyInAZ]

Hey all, I was wondering if anyone knows of any review outlets that have tested the Ryzen 5 7600 featuring two CCDs, with 5 cores disabled on each CCD??

Technically, this should result in a latency penalty for modern AAA video games, since games will have to offload work to both CCDs - because there aren't enough cores per CCD to effectively run the game.

Effectively, this version of the Ryzen 5 7600 works like the Ryzen 5 3600, where that chip had three cores enabled per CCX instead.

Thankfully Zen 4 has a much faster infinity fabric, so the latency penalty of utilizing both CCDs shouldn't be too bad on the 7600, but i still wonder what the differences are between the single CCD Ryzen 5 7600, 7600X, and the dual CCD version of the 7600.

 

[Roland Of Gilead]

No, haven't come across anything, yet.

Defo interested to see if there's any real drop in performance.

 

[Eximo]

Wasn't even aware they had two flavors. Only ten bucks more for the 7600X. I imagine most of them will end up in OEM systems?

 

[TechyInAZ]

Actually, disregard what I just said. I looked at the news where i got this from, and it was actually regarding 7600X's, but they don't use both CCDs.

One is disabled entirely. https://www.tomshardware.com/news/amd-firmware-disables-cores-7600x

So there is no such thing as dual CCD 7600's or 7600X's, just models that have one entire CCD disabled.

 

[hotaru.hino]

Out of curiosity I wondered if someone did any cross CCX latency testing by setting process affinity or something.

Instead I found this:

https://twitter.com/x/status/1581306086417580032

View: https://twitter.com/CapFrameX/status/1581306086417580032

 

[TechyInAZ]

Good question. Ironically I just saw some Tweets showing the new AMD Chipset Drivers with the 3D-VCache drivers are now making the 7950X behave like its X3D model - forcing games to run on a single CCD.

So that issue might be fixed already LOL.

 

[hotaru.hino]

Good question. Ironically I just saw some Tweets showing the new AMD Chipset Drivers with the 3D-VCache drivers are now making the 7950X behave like its X3D model - forcing games to run on a single CCD.

So that issue might be fixed already LOL.

I have a feeling that AMD's chiplet topology will run out of steam for low latency multicore applications unless they start designing CCX's with more than 8 cores. Or game developers can just stick with 8-cores maximum for the next decade.

 

[zx128k]

The 7800X3D should be faster in games than the 7950X3D. The thing is that you can turn one ccd off, just have the one with the 3D cache.

 

[hotaru.hino]

The 7800X3D should be faster in games than the 7950X3D. The thing is that you can turn one ccd off, just have the one with the 3D cache.

You don't have to do this with the 7950X3D, as AMD's drivers will force the affinity of games onto the 3D Cache CCX.

It still doesn't solve the lingering issue that there's significant cross CCX latency.

 

[zx128k]

Watched two videos on that point. One video showed the cpu as faster with one ccd disabled (hardware unboxed?). Another PC World showed tomb raider running on the x3d ccd only.

 

[GarrettL]

https://www.guru3d.com/articles-pages/ryzen-7800x3d-preview-7950x3d-one-ccd-disabled,1.html

 

[hotaru.hino]

Poking around, I found out that you can't really simulate a 7800X3D from a 7950X3D simply by disabling a CCX. The 7800X3D has a max boost speed of 5.0GHz, while the 7950X3D has a max boost speed of 5.7GHz. You can't set a maximum turbo boost ceiling either AFAIK.

While I'm sure you could overclock the 7800X3D, it's not a fair comparison unless you use their default settings.

 

[zx128k]

The maximum boost is the CCD without the 3XD cache on the 7950x3d but you could still be right.