AMD EPYC 4564P vs AMD Ryzen 9 PRO 9955 Comparison

The AMD Ryzen 9 PRO 9955 and the AMD EPYC 4564P are both server/workstation processors built for the AMD Socket AM5 platform, but they belong to different product lines and generations. The Ryzen 9 PRO 9955 is part of the 9000 series, codenamed Granite Ridge, using Zen 5 architecture on a 4 nm TSMC process. The EPYC 4564P belongs to the EPYC 4004 series, codenamed Raphael, using Zen 4 on a 5 nm node. The Ryzen offers 12 cores and 24 threads, while the EPYC provides 16 cores and 32 threads. The database records an average benchmark score of 110,612 for the Ryzen and 95,183 for the EPYC, placing them at the 97th and 96th percentiles of all CPUs respectively. Their nearest rivals confirm this positioning: the Ryzen sits 1.8% above the Intel Xeon w7-2595X, while the EPYC sits 0.5% below the AMD EPYC 9175F.

Where Each One Wins

The head-to-head benchmark suite covers eleven PassMark tests, and the EPYC 4564P wins eight of them, while the Ryzen 9 PRO 9955 wins three. The EPYC's victories are concentrated in throughput-oriented and multi-threaded workloads. It leads by substantial margins in data compression (858,105 vs 684,470, a 20.2% gap), data encryption (50,708 vs 33,754, a 33.4% gap), integer math (228,761 vs 182,312, a 20.3% gap), floating point math (141,017 vs 121,509, a 13.8% gap), and random string sorting (103,202 vs 71,928, a 30.3% gap). It also wins the overall multithread score (64,357 vs 54,866, a 14.7% gap), extended instructions (63,136 vs 54,903, a 13% gap), and physics (3,392 vs 3,332, a 1.8% gap). These results indicate that the EPYC's higher core count and higher boost clock (5.70 GHz vs 5.40 GHz) translate into clear advantages for parallel workloads, data processing, and encryption-heavy tasks.

The Ryzen 9 PRO 9955 wins in single-threaded performance and in prime number finding. Its single-thread score of 4,597 beats the EPYC's 4,292 by 7.1%, and it also wins the duplicate single-thread test by the same margin. In the find prime numbers test, the Ryzen scores 461 versus the EPYC's 365, a 26.3% advantage. These wins suggest that the Ryzen, despite having fewer cores, has better per-core efficiency and lower latency for single-threaded or latency-sensitive operations. The Ryzen also has a higher base clock of 3.40 GHz compared to the EPYC's 4.50 GHz, but the EPYC's boost clock is higher, so the single-thread edge likely comes from the Zen 5 architecture's improved instruction handling rather than raw clock speed.

The Verdict

The data points to a clear split: choose the EPYC 4564P when workloads are heavily parallel, involve large datasets, or require high throughput in encryption, compression, or math-heavy processing. Its 16 cores and 32 threads, combined with a 5.70 GHz boost clock, deliver consistent wins across the majority of the benchmark suite. The EPYC also has a higher TDP of 170 W, which aligns with its sustained performance under load. For users prioritizing single-thread responsiveness, prime number calculations, or applications that do not scale well across many cores, the Ryzen 9 PRO 9955 is the better fit. Its 7.1% single-thread advantage and 26.3% lead in prime number finding make it the stronger choice for workloads that depend on per-core speed. The Ryzen also has a higher aggregate average benchmark score (110,612 vs 95,183), indicating that across the full database of tests, it holds a slight overall edge despite losing most head-to-head matchups. This suggests that the Ryzen's strengths in single-threaded and certain integer operations compensate for its lower core count in the overall scoring. The EPYC, however, is the clear winner for multi-threaded and data-intensive tasks, which are typical for server environments.

Head-to-Head Benchmarks

The largest margins in the head-to-head results favor the EPYC. The biggest gap is in data encryption, where the EPYC scores 50,708 against the Ryzen's 33,754, a 33.4% difference. Random string sorting follows closely, with the EPYC at 103,202 and the Ryzen at 71,928, a 30.3% gap. Data compression shows a 20.2% lead (858,105 vs 684,470), and integer math a 20.3% lead (228,761 vs 182,312). These are substantial differences that would matter in real-world server workloads like database compression, cryptographic operations, and large-scale data transformation. The EPYC also leads in floating point math by 13.8% and in the overall multithread score by 14.7%, reinforcing its parallel processing advantage.

The Ryzen's wins are narrower but still significant. In single-thread performance, it scores 4,597 versus 4,292, a 7.1% advantage. The same margin appears in the duplicate single-thread test. Its prime number score of 461 versus 365 represents a 26.3% lead, which is the Ryzen's largest winning margin. This test likely reflects integer division and loop efficiency, where Zen 5's architecture shows a clear benefit. The physics test is the closest comparison, with the EPYC winning by only 1.8% (3,392 vs 3,332), indicating that both processors are nearly equal in this particular workload.

FAQ

Q: Which processor has higher single-thread performance?

A: The AMD Ryzen 9 PRO 9955 wins both single-thread tests, scoring 4,597 compared to the EPYC's 4,292, a 7.1% advantage.

Q: Which processor has more cores and threads?

A: The AMD EPYC 4564P has 16 cores and 32 threads, while the Ryzen 9 PRO 9955 has 12 cores and 24 threads.

Q: Which processor is better for multi-threaded workloads?

A: The EPYC 4564P wins the multithread score (64,357 vs 54,866) and also leads in most parallel tests, including data compression, encryption, and integer math.

Q: Do both processors support ECC memory?

A: Yes, both the Ryzen 9 PRO 9955 and the EPYC 4564P support ECC memory.

Q: What is the launch MSRP of the EPYC 4564P?

A: The launch MSRP of the AMD EPYC 4564P is $699.

Q: Which processor has a higher boost clock?

A: The EPYC 4564P has a boost clock of 5.70 GHz, while the Ryzen 9 PRO 9955 has a boost clock of 5.40 GHz.

Architecture Differences

The Ryzen 9 PRO 9955 uses the Zen 5 architecture on a 4 nm TSMC process, while the EPYC 4564P uses Zen 4 on a 5 nm process. The Ryzen's die is composed of two 70.6 mm² chiplets, with a total of 16,630 million transistors. The EPYC uses two 71 mm² chiplets and 13,140 million transistors. The Ryzen has a larger L1 cache per core (80 KB vs 64 KB), but both share 1 MB L2 per core. The L3 cache is 64 MB in both, though the EPYC lists it as "shared" while the Ryzen does not specify sharing. The Ryzen supports a memory bandwidth of 89.6 GB/s, slightly higher than the EPYC's 83.2 GB/s. Both support DDR5 memory and dual-channel memory buses. The EPYC offers 28 PCIe Gen 5 lanes (CPU only), while the Ryzen offers 24 lanes. Both include integrated Radeon Graphics and support ECC memory. The Ryzen was released on June 29, 2026, while the EPYC came out on May 20, 2024. The Ryzen is part of the 9000 series, while the EPYC belongs to the EPYC 4004 series. The Ryzen's codename is Granite Ridge, and the EPYC's is Raphael.

Specification Differences

The two processors differ in several key specifications. The Ryzen has 12 cores and 24 threads, while the EPYC has 16 cores and 32 threads. The base clock is 3.40 GHz for the Ryzen and 4.50 GHz for the EPYC. The boost clock is 5.40 GHz for the Ryzen and 5.70 GHz for the EPYC. The TDP is 120 W for the Ryzen and 170 W for the EPYC. The process node is 4 nm for the Ryzen and 5 nm for the EPYC. Transistor count is 16,630 million for the Ryzen and 13,140 million for the EPYC. Die size is 2x 70.6 mm² for the Ryzen and 2x 71 mm² for the EPYC. L1 cache per core is 80 KB for the Ryzen and 64 KB for the EPYC. The L3 cache is listed as 64 MB for both, but the EPYC explicitly states it is shared. Memory bandwidth is 89.6 GB/s for the Ryzen and 83.2 GB/s for the EPYC. PCIe lanes are 24 for the Ryzen and 28 for the EPYC. The release date is June 29, 2026 for the Ryzen and May 20, 2024 for the EPYC. The launch MSRP is $699 for the EPYC, while the Ryzen has no recorded launch MSRP in the database. The part numbers are 100-000001971 for the Ryzen and 100-000001476 for the EPYC.