Just to make it clear: my initial point is that the dense Epycs are mostly meant for hyperscalers, which use those CPUs as VM hosts, and more often than not overprovision those (which I believe we can agree ends up trashing the cache due to all context switches).
Another user argued that 3D-Cache would be beneficial to such Epycs, and I argued against it because for a VM host scenario it has no benefits while costing more.
I don't think I mentioned anything straight related to cache trashing and dual CCD chips.
I do believe the core parking stuff is solely related to the increased latency, but that's only relevant for games, I guess.
Depends on the application, but it's relevant still. You can measure it with profiling tools, as an example:
View attachment 360282
Chips and cheese usually has a nice comparison w.r.t. that kind of stuff, you can see it for the 9950x in their post:
AMD’s desktop Zen 5 products, codenamed Granite Ridge, are the latest in the company’s line of high performance consumer offerings.
chipsandcheese.com
Not really, it seems to be mostly a latency issue.
About it being a victim cache? It has been like so for all moderns CPUs for quite a while lol
But take it from AMD themselves:
View attachment 360286
Also some extra sources in case you want to get more into it:
Performance monitoring and benchmarking suite. Contribute to RRZE-HPC/likwid development by creating an account on GitHub.
github.com
AMD’s Zen line has gone a long way since it brought AMD’s CPU efforts back from the dead.
chipsandcheese.com
www.anandtech.com
I think you're conflicting ideas at this point. Having L3 as a victim cache is not a "problem" haha
If you're running java stuff inside of a VM, you'll still see improvements related to Zen 5. The VM won't nullify that.
It's not that often that you see virtualization improvements, because there's not really much to improve upon at all (mostly stuff related to context switches and whatnot), but this has no relation to the kind of stuff running inside of said VM.
FWIW, I'm really eyeing a 9950x to upgrade from my 5950x, the gains with python, numpy, databases and compile stuff are amazing and are things that I work with on a daily basis. The 7950x was kinda okaish in those regards, but the 9950x makes it a really worthwhile jump for me.