AMD EPYC 8004 – premiere and specification of Siena server processors with high energy efficiency

Over the past year, AMD has unveiled several different series of EPYC server processors using the Zen 4 (and Zen 4c) microarchitecture. First, we received EPYC Genoa systems with up to 96 Zen 4 cores. Then the series was joined by the EPYC Bergamo models (up to 128 Zen 4c cores) and EPYC Genoa-X, i.e. processors using 3D V-Cache packaging technology. However, as has been known for a long time, Zen 4 in EPYC processors was to be used for one more product series – Siena. Today, these units are officially included in the manufacturer’s offer.

AMD officially presents EPYC 8004 server processors from the Siena series, characterized by the use of Zen 4c cores and high energy efficiency. The systems will be used in stations from companies such as Dell, Lenovo and Supermicro WIO.

AMD Zen 4c – we learned the details of the microarchitecture that became the basis for EPYC Bergamo processors

AMD EPYC Siena processors have different housing dimensions, so the SP6 socket is used for their proper operation, instead of the SP5 from the Genoa / Bergamo generation. EPYC Siena systems have been prepared for tasks where energy efficiency is the most important, i.e. calculations, e.g. in the cloud or for telecommunications networks. Compared to the EPYC Genoa or Bergamo systems, the EPYC Siena processors debuting today are characterized by the presence of only four chiplets, 16 Zen 4c cores in each. Thus, the EPYC 8004 (Siena) systems will offer from 8 to a maximum of 64 cores (of course with support for SMT concurrent multithreading). EPYC Siena means, above all, excellent (for server standards) energy efficiency, high Watt/$ ratio, balanced performance and flexibility in system construction.

AMD EPYC Genoa-X and EPYC Bergamo – official presentation of server processors with up to 128 cores

Socket SP6 is supported only in the “1P” formula, where, for comparison, the EPYC Genoa(-X) and Bergamo systems can operate in 1P and 2P configurations. EPYC Siena systems are characterized by a TDP in the range of 70 W to 225 W. They have a 6-channel DDR5 4800 MHz memory controller (with support for up to 1152 GB RAM), and the user also has 96 PCIe 5.0 lines and 48 CXL lines at the user’s disposal. 1.1. Like other Zen 4 processors, EPYC Siena also offers support for AVX-512 instructions, as well as Infinity Fabric and Infinity Guard technologies. AMD presents a total of 12 EPYC 8004 “Siena” processors, six of which can operate in the temperature range from 0 to 75 degrees, and the remaining six – from -5 to plus 85 degrees. AMD additionally confirmed that the Zen 4c core was manufactured in the same TSMC 5 nm technological process (N5), while the core area with the L2 cache was reduced from 3.84 mm² to 2.48 mm². The IPC of Zen 4c is identical to Zen 4.

AMD EPYC 9004 – official debut of EPYC Genoa server processors with up to 96 Zen 4 cores

The most efficient processors will be AMD EPYC 8534P and EPYC 8534PN units. The former works with a default TDP of 200 W and can be adjusted (cTDP) in the range from 155 to 225 W. The base clock is 2.3 GHz with the possibility of increasing it to 3.1 GHz. As you can see, EPYC Siena systems are characterized by very low Turbo increases, thanks to which they are able to operate in a much lower TDP range. However, even with the slight increase in Turbo, the actual performance of the Siena systems is sufficient for the tasks for which they were designed. EPYC Siena processors will be implemented in various systems, and three of them have just been revealed. These are: Dell PowerEdge C6615, Lenovo ThinkEdge SE455 and Supermicro WIO System.

Source: AMD, PurePC