At CES 2023, AMD announced the new AMD Ryzen 7000X3D series. This is the next generation of the AMD Ryzen 7 5800X3D with 3D V-Cache. AMD is releasing not just one but three new SKUs with this generation. As a direct result of these parts, we can extrapolate a reasonable L3 cache guess for the upcoming AMD Genoa-X.
AMD Ryzen 7950X3D Launch
The first CPU that AMD announced was the AMD Ryzen 7 7800X3D. This is the new 8-core 3D V-Cache part that is the direct successor the the Ryzen 7 5800X3D.
Next, the company announced the AMD Ryzen 9 7950X3D. This is not just an 8-core part, but instead is a 16-core/32-thread part with up to a 5.7GHz boost and 128MB of L3 cache.
AMD has 8, 12, and 16-core 3D V-Cache enabled variants. The 12-core model will be the AMD Ryzen 9 7900X3D. It is great to see that we are getting higher core count parts with the 3D V-Cache so we do not have to choose between cores and cache. Still, it seems like we are getting less cache per-CCD on the 12 and 16-core chips.
The company said the new chips will be available in February 2023 but did not provide pricing.
Final Words and AMD Genoa-X Implications
To us, the 3D V-Cache parts are the most interesting of the Ryzen 7000 series lineup. There are so many applications that are actually memory bandwidth sensitive that these chips with massive caches are very exciting.
So what does this all mean for the server side? AMD Milan-X tripled the L3 cache over standard AMD EPYC 7003 Milan parts, adding 64MB of L3 cache per CCD. That gave us 8 CCDs x (32MB + 64MB per CCD) = 768MB L3 cache per Milan-X part. The AMD Ryzen 7800X3D seems to follow this same trend of adding 64MB of L3 cache per CCD. For AMD EPYC Genoa with up to 12 CCDs, that would give us 12 CCDs x (32MB + 64MB per CCD) = 1152MB of L3 cache. That means Genoa-X is slated to be a GB of cache CPU, joining the Intel Xeon Max series as GB-era CPUs.
One other really interesting bit from the AMD keynote is that they are embedding Xilinx-derived XDNA AI accelerators in the company’s new mobile parts:
That new feature means that AMD is showing AI comparisons between its newest Ryzen 7040 series of mobile CPUs and the Apple M1/M2 silicon. Whereas Intel is pushing features like VNNI, AMX, and etc. as on-core accelerators, AMD seems to be looking more towards dedicated acceleration blocks like Apple.
AMD is extending XDNA to the new AMD Alveo V70 as a PCIe card AI accelerator to go after markets that GPUs like the NVIDIA T4 target. We are starting to see AMD’s AI strategy take shape.