Question Is inter-CCD latency give any significant performance hit on Ryzen 5900X/5950X and 7900X/7950X for gaming??

[Wolverine2349]

Is it an issue where 1% lows or 0.1% lows could drop severely for a CPU thread intensive game if a thread has to communicate with a thread on the other CCD??

Or has it been fixed or not an issue with Ryzen 7000 anymore??

And is it true that all Ryzen 7900X CPUs are 2 6 core CCDs and all 7950X CPUs are 2 8 core CCDs?? Or are there any 790X with an 8 core CCD and 4 core CCD??

 

[hotaru.hino]

Well AMD preferred core system. Does that still apply if you are doing manual overclocking. I imagine with dual CCDs it still does, but not with a single CCD like 7700X/7600X?

It matters regardless of how many CCDs you have in the processor. The top preferred cores are the only ones that will hit high clock speeds; they're the ones guaranteed to hit the advertised maximum boost speed and possibly beyond. The other cores may not even be able to hit the advertised boost speed. This was brought up during Zen 2 that it was enough for de8aur got involved.

In general are threads for most modern games produced from 2012 to 2022 (last 10 years) have threads that need lots of data sharing between each other, or do related game threads have data completely independent of each thread??

It depends on the game. There's no way to really answer this.

SO basically is having game threads on 2 CCDs bad just as having game threads on e-cores is bad. But patches form Microsoft or AMD and Intel or game company fix it so the game will only stay only on cores on one CCD and never the other or in Intel's case stay on only the P cores and avoid touching e-cores entirely.

But maybe having the extra CCD with extra ciores and even the e-cores can benefit not the game itself, but maybe slightly smoother gameplay as they pickup background tasks where as an 8 core only single CCD or Intel with e-cores disabled does not have that extra slack. Though difference probably almost nill unles you have lots of heavy background stuff running that spikes CPU usage beyond 5% on one core or a CPU intensive foreground task you just minimize like streaming or video editing.

Again, it depends on what's going on. These setups are not automatically bad for gaming, it just depends on how can organize and implement the work done to make the most use out of the hardware. In this case, yes you can use the E-cores or cores on the other CCDs for doing background tasks or tasks that aren't that compute intensive or time sensitive.