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AMD Ryzen 9 7950X3D CPU with dual 32MB 3D V-cache stacks spotted, up to 192MB cache

A user purchased an AMD Ryzen 9 7950X3D CPU that reportedly includes 3D V-Cache stacks on both Zen 4-core chips.

AMD’s Ryzen 9 7950X3D CPU with up to 192MB cache spotted in Dual CCD 3D V-Cache Boosted design, could be a software reporting issue or a rare technical example

According to a video published on Bilibili, a user has reportedly gotten their hands on an AMD Ryzen 9 7950X3D CPU with 192MB of L3 cache onboard, which is 64MB more L3 cache than the stock chip.

While it is uncertain whether the change was actually to the L3 cache, testing the processor on CPU-Z also revealed the exact figure of 192MB, meaning it was possibly a permanent change. There are also other theories about this change, which we will discuss later.

Image source: Bilibili

Now, the possibility of a 192MB L3 cache on the Ryzen 9 7950X3D CPU is not completely ruled out, as this is possible by tinkering with the chiplet configuration. To achieve such a configuration, both Zen 4 CCDs on the Ryzen 9 must have 64 MB 7950X3D 3D V-Cache stacks. The two CCDs on the chip already have 64 MB of L3 cache (32 MB per CCD) and a single 3D V-Cache stack provides an additional 64 MB of cache. So far, all of AMD’s Ryzen X3D CPUs have shipped with a single 3D V-Cache stack. Such configurations provide up to 192 MB of L3 cache (64 MB from the Zen 4 CCDs and 128 MB from the 3D V-Cache stacks).

It is essential to note that while a larger cache size can result in a huge performance boost, it can be difficult for manufacturers to capture cache stacks as it disrupts cache uniformity, ultimately leading to higher latencies in gaming and professional performance . This is why the AMD Ryzen 7 7800X3D actually outperforms the 7900X3D, which has a single 3D V-Cache stack on a 6-core Zen 4 CCD versus the 8-Core 3D V-Cache stack on the 7800X3D and 7950X3D CPUs.

Image source: AMD

AMD covered this move in a Gamers Nexus coverage, so it could be possible that the above chip is a technical example, as AMD made Ryzen 9 5950X3D and Ryzen 9 5950X3D CPUs with dual 3D V-Cache boost CCDs, but that were only limited to internal test samples.

Another hypothesis about this change is that it may be a bug in Windows as a whole. Therefore, both Task Manager and CPU-Z show changed specifications. Either way, it is indeed something interesting to look at. It’s too early to say if we’ll see a Ryzen 9 7950X3D CPU with 192MB L3 cache on the market, but we can’t rule out the possibility. The user who posted the video said that a follow-up is coming soon that will help us find out if the chip contains such a large amount of cache and if he got his hands on a rare copy or if it’s just a reporting issue is. .

News source: HXL