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AMD Introduces EPYC 8004-Series ‘Siena’ CPUs

AMD EPYC 8004 Siena
Written by Kirsten Campbell

AMD has unveiled EPYC 8004-series processors for edge servers.

Previously disclosed under the codename Siena, the EPYC 8004 series is AMD’s low-cost sub-set of EPYC CPUs, aimed at the telco, edge, and other price and efficiency-sensitive marketing segments. Based on the same Zen4c cores as Bergamo, Siena is essentially Bergamo-light, using the same hardware to offer server processors with between 8 and 64 CPU cores. The new CPUs come in an all-new SP6 form-factor, pack up to 64 Zen 4c cores, and feature a six-channel DDR5 memory subsystem. AMD’s EPYC ‘Siena’ processors are designed for edge and communications servers that rely on one processor and require advanced I/O and power efficiency more than raw performance.

“The new EPYC 8004 Series processors extend AMD leadership in single socket platforms by offering excellent CPU energy efficiency in a package tuned to meet the needs of space and power-constrained infrastructure,” said Dan McNamara, senior vice president and general manager, Server Business, AMD.

Besides the reduced excitement that comes with the launch of lower-end hardware, there is, strictly speaking, no new silicon involved in this launch. Siena is comprised of the same 5nm Zen 4c core complex die (CCD) chiplets as Bergamo, which are paired with AMD’s one and only 6nm EPYC I/O Die (IOD). As a result, the EPYC 8004 family isn’t so much new hardware as it is a new configuration of existing hardware – about half of a Bergamo, give or take.

And that half Bergamo analogy isn’t just about CPU cores; it applies to the rest of the platform as well. Underscoring the entry-level nature of the Siena platform, Siena ships with fewer DDR5 memory channels and fewer I/O lanes than its faster, fancier counterpart. Siena only offers 6 channels of DDR5 memory, down from 12 channels for other EPYC parts, and 96 lanes of PCIe Gen 5 instead of 128 lanes. As a result, while Siena is still a true Zen 4 part through and through (right on down to AVX-512 support), it’s overall a noticeably lighter-weight platform than the other EPYC family members.

“AMD has delivered multiple generations of data center processors that provide outstanding efficiency, performance, and innovative features,” added McNamara. “Now with our 4th Gen EPYC CPU portfolio complete, that leadership continues across a broad set of workloads – from enterprise and cloud, to intelligent edge, technical computing and more.”


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Product Editor | + posts

Kirsten Campbell is a Marketing Tornado and junk robot of information. Analytical and creative, she has been in marketing and communications since 2008 and worked with everyone from small businesses to your favorite household names. 


Ask her about the time she made a numismatics blog interesting (yes, really) or wrote an obit for a family she never met.


An ardent admirer of corporate snark played out online, Kirsten loves Reese’s peanut butter cups and still isn't over the Mars Rover.

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AMD Introduces EPYC 8004-Series ‘Siena’ CPUs

by Kirsten Campbell time to read: 2 min