Friday, September 27th 2024
AMD Ryzen 9 9950X3D and 9900X3D to Feature 3D V-cache on Both CCD Chiplets
Earlier this week, we got rumors that AMD is rushing in the Ryzen 7 9800X3D 8-core/16-thread "Zen 5" processor with 3D V-cache for a late-October debut. The 9800X3D succeeds the popular 7800X3D, and AMD probably hopes it will have a competitive gaming processor in time for Intel's Core Ultra 2-series "Arrow Lake-S" launch. In the previous article, it was reported that the higher core-count 9000X3D series processor models, the Ryzen 9 9950X3D and Ryzen 9 9900X3D, would arrive some time in Q1 2025, because it was reported that the chips have certain "new features" compared to their predecessors, the 7950X3D and 7900X3D. At the time, we even explored the possibility of AMD giving both 8-core CCDs on the processor 3D V-cache. Turns out, this is where things are headed.
A new report by Benchlife.info claims that the higher core-count 9950X3D and 9900X3D will implement 3D V-cache on both CCD chiplets, giving these processors an impressive 192 MB of L3 cache (96 MB per CCD), and 208 MB or 204 MB of "total cache" (L2+L3). The report also says that AMD is planning a Ryzen 5 9600X3D chip, its second attempt at taking on Intel's Core i5 lineup, following its very recent release of the Ryzen 5 7600X3D, which ended up 1-3% short of the Core i5-14600K in gaming workloads. There's no word on whether the 9600X3D will launch in October alongside the 9800X3D, or in Q1-2025 with the Ryzen 9 9000X3D series.Documentation indicates that the max 3DVCache is still 64 MB, for a total of 96 MB L3 per CCD.The introduction of 3D V-cache on both CCDs of the 9950X3D and 9900X3D could be interesting, as both chiplets will be capable of gaming workloads at a uniform performance level. On the 7950X3D and 7900X3D, OS scheduler-level QoS logic ensure gaming workloads are scheduled to the CCD with the 3D V-cache, while multithreaded productivity workloads are allowed to spread across both CCDs.
Source:
Benchlife.info
A new report by Benchlife.info claims that the higher core-count 9950X3D and 9900X3D will implement 3D V-cache on both CCD chiplets, giving these processors an impressive 192 MB of L3 cache (96 MB per CCD), and 208 MB or 204 MB of "total cache" (L2+L3). The report also says that AMD is planning a Ryzen 5 9600X3D chip, its second attempt at taking on Intel's Core i5 lineup, following its very recent release of the Ryzen 5 7600X3D, which ended up 1-3% short of the Core i5-14600K in gaming workloads. There's no word on whether the 9600X3D will launch in October alongside the 9800X3D, or in Q1-2025 with the Ryzen 9 9000X3D series.Documentation indicates that the max 3DVCache is still 64 MB, for a total of 96 MB L3 per CCD.The introduction of 3D V-cache on both CCDs of the 9950X3D and 9900X3D could be interesting, as both chiplets will be capable of gaming workloads at a uniform performance level. On the 7950X3D and 7900X3D, OS scheduler-level QoS logic ensure gaming workloads are scheduled to the CCD with the 3D V-cache, while multithreaded productivity workloads are allowed to spread across both CCDs.
126 Comments on AMD Ryzen 9 9950X3D and 9900X3D to Feature 3D V-cache on Both CCD Chiplets
Games are the single biggest beneficiary of the extra cache, but they need that cache to be unified. For productivity applications, the reduced clockspeed of the CCD with v-cache is actually a downside that hinders performance.
So, if games can't take advantage because the cache isn't unified between both CCDs, and the extra cache hurts application performance in everything else because of the reduction in clockspeeds, I do not think there is any point including v-cache on both CCDs. It's just added cost that seems like a lose-lose scenario.
If AMD have found a way to link the cache so that any core can access v-cache on either die, then AMD have truly made a winner and I suspect the 7800X3D's gaming performance crown is about to be blown away by the 9950X3D. We can hope, right?
Now the narrative can be satisfied. I guess we will see what happens as AMD said it made no difference so time to see if the AMD engineers are wrong.
Their previous approach worked just fine and with scheduler improvements would've improved further. This will literally not do anything other than make uninformed people happy that there's extra victim cache on both CCD's which will do nothing in reality.
Don't think this is going to happen. AMD can't care any less about the people wanting extra cache on both CCD's thinking it'll magically improve performance. It won't.
But since everyone keep trashing Zen 5... Something that has been the norm since the first X3D chip came out, but since the norm everywhere is to trash AMD regardless, you end up with the current narrative used everywhere that Zen 5 is absolute trash because its not a good gaming CPU but continuing bellow.. Please do repeat that to all the haters that are trashing the current Zen 5 CPU's due to not being good in ...gaming...
I am curious to see if this time, adding 3D cache on both CCD's works. And saving on popcorn, for when the price is announced...:roll:
I'm pretty sure the L3 cache on Zen is coherent, but it's a victim cache whose cross-CCD costs doesn't make much sense to care about this that much, as far as I know.
Thanks.
I don't see a point of a 2x CCD v-cache CPU for games, the 9800x3D is likelly still going to be faster, so no real benefit. I may be wrong on that, of course, so we need to wait for the product to become a thing and benchmarks to come out.
CFD and HPC I don't even think are really significative because, as I said above, those are better suited to platforms with way more channels. I agree with that, but then it means that having the 2 CCDs with the extra cache is kinda pointless to begin with.
X3D on dual CCD probably wasnt the best of ideas on previous models, though none of us really know that for certain.. I am willing to bet they will make it make a difference.
Gaming on Ryzen 9 is not nearly as bad as some make it out to be lol..