According to his tweet @yuuki_ans AMD is updating the nomenclature for its Zen 4 based EPYC server processors (codenamed Genoa and Bergamo). These changes include new 8000 and 9000 series badges for new CPU architectures. The new model number change takes into account his two-core design for Zen 4, which includes the standard Zen 4 and the more efficient Zen 4c core.
Genova and Bergamo will feature AMD’s new Zen 4 CPU architecture. For the first time, AMD splits server processors into his two architectural groups. One will feature vanilla Zen 4 cores (as seen in the Ryzen 7000) and the new Zen 4 cores known as Zen 4c are optimized for cloud-centric servers.
Update: 1. 4th Gen AMD EPYC Naming Convention 2. AMD EPYC Genoa-X Model (P1: My Stats Form) (P2: Table in AMD’s File) (P3: Naming Convention) —–Others content will be sent later later… pic.twitter.com/byel6eRe6wSeptember 1, 2022
The Zen 4c will be a denser version of the Zen 4 with smaller CPU cores and more core counts compared to the standard Zen 4 EPYC. As a result, the Zen 4c processor can be expected to be more efficient at highly multithreaded workloads, but suffers from single-core workloads and L3 cache sensitive applications.
The Zen 4 EPYC’s most notable naming changes include a new naming scheme from 7002 and 7003 to 9004 and 8004. The 9004 stands for EPYC processors using the SP5 socket and the 8004 respects chips running on the SP6 socket. From what we know about these two new sockets, SP5 will be focused on heavy duty server platforms with a maximum TDP rating of 400W, while SP6 will be optimized for compact edge and infrastructure servers with a maximum TDP rating of 225W.
The next number after 9 or 8 represents the number of cores for each SKU, where each number typically doubles the number of cores in the previous number. For example, the number 0 corresponds to 8 cores and the number 1 corresponds to 16 cores. The only exceptions to the double rule are the numbers 4, 6, and 7, where 4 represents 48 cores, 6 represents 84-96 cores, and 7 represents 112-128 core fractions.
Genoa has parts in almost every core count configuration, with numbers 0 to 6 representing 8 to 96 cores. However, the cloud-optimized Bergamo Zen 4c chip only makes use of the numbers 4, 5, and 7. This represents core counts from 48 and 64 to 112-128 cores.
According to Yuuki, the following numbers represent relative performance numbers from 1 to 8, representing clock speed modifiers. The higher the number, the faster the clock speed.
Finally, there is a letter at the end of the SKU, with the same modifiers as Zen 3. For example, P stands for 1 CPU per socket, X stands for 3D V-Cache feature, and F stands for High Frequency. model.
New model name
Yuki also introduced new models for Genoa and Bergamo parts and revealed how many potential SKUs there are across AMD’s Zen 4 EPYC lineup.
This goes up to 24 in total, from X3D models to single socket models to high clock speed models to standard models to Zen 4c variants.
The first two chips in the lineup represent AMD’s budget-friendly EPYC processors, the 9124 and 9224. These chips only have 64MB of L3 cache (below Ryzen 9 5900X) and feature 16 and 24 cores respectively. It has a TDP of 200W and core frequencies ranging from 2.15 and 2.6GHz base to 3.5 and 3.7GHz boost.
Known as the 9254, 9334, 9454 and 9534, the next four chips in the lineup will be AMD’s balanced and optimized chips designed for a wide range of workloads. Core counts range from 24, 32, 48, and 64 cores, but the L3 cache jumped to 128MB on 24 and 32 cores and 256MB on the rest. The TDP is the same for the 24, but the 32-core capability jumps to 210W, while the 48- and 64-core variants top out at 280W and 290W. The core count range is 2.3-2.85GHz base and 3.5-3.7GHz boost.
Next, in the middle of the ‘standard’ lineup is a chip known as the 9354 which features 32 cores but a massive increase to 256MB of L3 cache. The TDP is comparable to the 48-core and 64-core standard models. The chip is optimized for power-intensive workloads and his L3 cache-intensive applications. The chip has a base of 2.7-2.9 GHz and a boost of 3.5-3.7 GHz.
Then 9634, 9654, 9734, and 9754 represent AMD’s Super Core Heavy SKUs. The 9634 comes with 84 cores, 384MB of L3 cache and a TDP of 320W to 400W. The 9654 has the same specs except the core count has jumped to 96, and both chips feature 12 CCDs.
The 9734 and 9754 are not Bergamo chips with Zen 4c cores. These chips have significantly different specs of 112 and 128 cores respectively, but the L3 cache is significantly reduced to 256MB and the CCD is reduced to 8. This shows that Zen 4c is much denser and AMD can pack far more cores into the chip at the same time with fewer CCDs.
The 9634 has a TDP of 290W, 9654 360W, 9734 340W, and 9754 360W. As a result, we can expect these chips to focus on core-intensive workloads that may not benefit from a lot of L3 cache. The 9634 and 96554 have 2GHz base and up to 3.7GHz boost, while the Bergamo chip has 2GHz base and up to 3.2GHz boost.
Then there are the high frequency variants including the 9174F, 9274F, 9374F and 9474F with 16, 24, 32 and 48 cores respectively. These chips have 256MB of cache and a significant boost in frequency to over 4GHz. As a result, the TDP is also significantly higher, with a cTDP of 320W to 400W.
The strangest SKU is the 9554, positioned as a “moderately optimized” chip. The chip has a TDP significantly increased to 360W and a base clock boost of 2.7GHz to 2.9GHz, but based on these spec differences, this chip is specifically designed for high power applications. .
Finally, there are single socket models including the 9354P, 9454P, 9554P, and 9654P. In effect, these chips are single-socket versions of budget-friendly, balanced, moderately optimized, core-heavy SKUs.
There are also 3D V-Cache chips, but their specs are unknown. There are model names like 9184X, 9284X, 9384X, 9684X and that’s it.
