Thanks to a new leak we have been able to learn the first details of the AMD EPYC 8004, known by the code name Siena, a new range of AMD processors that in theory will be based on the Zen 4 architecture, but will have a very curious configuration at the L3 cache level, since there will be a significant reduction compared to the AMD EPYC 9004, identified as Genoa.
The AMD EPYC 9004 have a configuration of 8 cores and 16 threads in addition to 32MB L3 cache per chiplet, which makes a processor with 64 cores and 128 threads have 256 MB of L3 cache. Well, according to this leak, the AMD EPYC 8004 will have 16 MB L3 cache per chipletwhich means that a processor with 64 cores and 128 threads will have 128 MB of L3 cache.
This has made me think that perhaps the source has been wrong, and that this new generation could really be based on Zen 4c architecture which, as our readers will remember, keeps all the major keys of the Zen 4 architecture but halves the L3 cache. This allows increasing the density of cores and threads per processor to a maximum of 128 and 256, respectively.
AMD EPYC 8004 will use the new socket SP6, and will give life to a new platform that will emerge as a cheaper alternative that will try to balance its relationship at the level of cost, performance and consumption. The entry model will have a configuration of 8 cores and 16 threads and a TDP of 90 watts, and the most powerful version will reach 64 cores and 128 threads, and will have a TDP of 200 watts.
All of these processors will support configurations of eight-channel DDR5 memory at 4,800 MHz, while the AMD EPYC 9004 supports twelve channel configurations. The details I’ve seen about the L3 cache configuration of the AMD EPYC 8004s are somewhat confusing to me, as the 8-core, 16-thread AMD EPYC 8024P would have 32MB of L3 cache, 32MB per chiplet, but the 64 8534P cores and 128 threads would only have 128MB of L3, 16MB per chiplet.
We will have to wait for the official launch to resolve these doubts, but perhaps this disparity is due to the fact that AMD has decided to use Zen 4 and Zen 4c depending on each specific model within this new range of CPUs. In any case, this leak has no official origin, and therefore we must take it with caution, as always.
