AMD Discloses Zen 4C Architecture Details: Same Design As Zen 4, 35% Smaller, 2x Density & Cores

wccftech.com:

AMD has further shared details of its Zen 4C core which will feature double the density in a smaller footprint on the EPYC Bergamo CPUs.

In new slides shared by TechpowerUp, we get a taste of what the AMD Zen 4C core architecture is all about. The first slide shows a comparison between all three EPYC 9004 offerings with standard Genoa CPUs used as a reference. The Genoa-X CPUs can be seen to offer higher cache per core & the Bergamo CPUs can be seen to focus more on power efficiency and core density. Higher cores and density on the Bergamo chips are achieved through the integration of Zen 4C cores.

Once again, before we start, I would like to share some of the main features of the AMD Bergamo lineup:

Yesterday, we finally came to learn that the Zen 4C core on the EPYC Bergamo CPUs measures just 2.48mm2 versus the 3.84mm2 of the standard Zen 4 cores. The area includes both the core and its L2 cache. Both Zen 4 and Zen 4C cores are based on TSMC's 5nm process node. Previously, Zen 4C was expected to utilize the TSMC 4nm process node.

AMD managed to fit twice the number of cores and threads with the same L2 cache within a die size that's under 10% bigger than the Zen 4 CCD (72.7mm2 vs 66.3mm2). The Zen 4C CCD which is codenamed "Dinoysus" has an overall -35.4% lower core area and almost every aspect of the CCD has been reduced by -35% to -45%. The full Bergamo chips pack a total of 82 billion transistors on the package.

So coming to the major changes between Zen 4 and Zen 4C on an architectural level, only the L3 cache per core has been reduced from 4 MB per core to 2 MB per core. The rest of the specs are entirely the same and that's a huge deal considering Zen 4C isn't a full-on different architecture from Intel's E-Core and