AMD EPYC 4564P vs AMD Ryzen 9 9955HX3D Comparison

The AMD Ryzen 9 9955HX3D and AMD EPYC 4564P are both 16-core, 32-thread processors that land in the 96th percentile of all CPUs, but they are built for entirely different environments. The Ryzen 9 is a mobile part on AMD Socket FL1, while the EPYC is a server/workstation chip on Socket AM5. Benchmark data shows a clear split: the EPYC dominates in most multi-threaded and memory-heavy workloads, while the Ryzen 9 wins in several specific math and physics tests, despite having a much lower TDP.

FAQ

Q: Which processor has more cores and threads?

A: Both the AMD Ryzen 9 9955HX3D and the AMD EPYC 4564P have 16 cores and 32 threads, so core count is a tie.

Q: What is the biggest performance gap in the benchmarks?

A: The largest delta is in Cinebench R23 single-core, where the EPYC 4564P scores 7848 versus the Ryzen 9’s 2159.5, a 72.5% advantage for the EPYC.

Q: Does the Ryzen 9 win any benchmarks?

A: Yes, the Ryzen 9 9955HX3D wins 6 of the 15 head-to-head tests, including PassMark find prime numbers (525 vs 365, a 43.8% lead) and PassMark physics (4687 vs 3392, a 38.2% lead).

Q: Which chip has a higher boost clock?

A: The AMD EPYC 4564P has a higher boost clock at 5.70 GHz, compared to the Ryzen 9 9955HX3D’s 5.40 GHz.

Q: Is there a difference in L3 cache capacity?

A: Yes, the Ryzen 9 has 128 MB of L3 cache, while the EPYC has 64 MB (shared).

Q: Which processor has a higher average benchmark score?

A: The Ryzen 9 9955HX3D has a slightly higher average benchmark score of 97453, compared to the EPYC 4564P’s 95183, though both are in the 96th percentile.

Architecture Differences

The two chips come from different generations of AMD architecture. The Ryzen 9 9955HX3D is built on the Zen 5 core architecture with the codename "Fire Range," while the EPYC 4564P uses the older Zen 4 architecture with the codename "Raphael." This architectural gap is reflected in their process nodes: the Ryzen 9 is manufactured on a 4 nm process at TSMC, whereas the EPYC is on a 5 nm process, also at TSMC. The transistor counts differ accordingly, with the Ryzen 9 containing 16,630 million transistors across a die size of 2x 70.6 mm², while the EPYC has 13,140 million transistors on a 2x 71 mm² die.

Cache hierarchies also differ significantly. The Ryzen 9 uses a per-core L1 cache of 80 KB and a per-core L2 cache of 1 MB, with a large 128 MB L3 cache. In contrast, the EPYC has a smaller 64 KB per-core L1 cache, the same 1 MB per-core L2, but only 64 MB of shared L3 cache. The Ryzen 9’s larger L3 is a key differentiator in its architecture. Both chips support DDR5 memory with dual-channel buses, but the Ryzen 9 has a slightly higher theoretical memory bandwidth of 89.6 GB/s versus the EPYC’s 83.2 GB/s. Both support ECC memory. The Ryzen 9 also includes integrated Radeon 610M graphics, while the EPYC has a generic Radeon Graphics solution.

Where Each One Wins

The benchmark results paint a clear picture of workload specialization. The EPYC 4564P is the clear winner in most multi-threaded and server-oriented tasks. It wins 9 of the 15 head-to-head benchmarks, including decisive victories in Cinebench R23 multi-core (55592 vs 38161.5), PassMark data compression (858105 vs 785811), PassMark data encryption (50708 vs 39446), and PassMark random string sorting (103202 vs 83497). These results suggest the EPYC is better suited for data processing, compression, and encryption workloads that benefit from its higher base and boost clocks.

The Ryzen 9 9955HX3D, despite being a mobile chip, takes the win in a few specialized areas. It leads in PassMark find prime numbers (525 vs 365), PassMark physics (4687 vs 3392), PassMark floating point math (144122 vs 141017), and PassMark single-thread (4511 vs 4292). The physics and prime number results indicate the Ryzen 9’s architecture handles certain integer and physics calculations more efficiently. However, the EPYC’s wins in Cinebench R23 single-core (7848 vs 2159.5) are so large that the Ryzen 9’s single-thread PassMark win appears to be a specific workload anomaly rather than a general trend.

Specification Differences

The two processors differ in almost every specification except for core count, thread count, manufacturer, socket lane count, and ECC support. The Ryzen 9 9955HX3D has a base clock of 2.50 GHz and a boost clock of 5.40 GHz, while the EPYC 4564P runs at a much higher 4.50 GHz base and 5.70 GHz boost. The TDP is dramatically different: the Ryzen 9 is rated at 55 watts, while the EPYC is rated at 170 watts. The Ryzen 9 uses AMD Socket FL1, whereas the EPYC uses AMD Socket AM5. The Ryzen 9 is from the 9000 series with a Fire Range codename, while the EPYC is from the 4004 series with a Raphael codename.

The Ryzen 9 is unlocked, while the EPYC is locked. Their release dates differ, with the Ryzen 9 releasing on 2025-01-05 and the EPYC on 2024-05-20. The Ryzen 9 has a larger L3 cache (128 MB vs 64 MB) and a smaller L1 cache per core (80 KB vs 64 KB). The Ryzen 9’s process node is smaller (4 nm vs 5 nm). The EPYC has a launch MSRP of $699, which is the only price data available. The Ryzen 9 does not have a listed launch MSRP. The EPYC’s market segment is Server/Workstation, while the Ryzen 9 is classified as Mobile.

Head-to-Head Benchmarks

The most striking comparison is in Cinebench R23 single-core, where the EPYC 4564P scores 7848 against the Ryzen 9’s 2159.5, a massive 72.5% advantage. This is the largest delta in either direction and shows the EPYC’s raw clock speed advantage is overwhelming in lightly-threaded rendering tasks. The EPYC also wins Cinebench R23 multi-core with a score of 55592 versus 38161.5, a 31.4% lead, despite the Ryzen 9’s larger L3 cache.

The Ryzen 9’s biggest win comes in PassMark find prime numbers, where it scores 525 versus the EPYC’s 365, a 43.8% lead. This is a specialized integer workload where the Ryzen 9’s architecture clearly excels. The Ryzen 9 also wins PassMark physics with a score of 4687 versus 3392, a 38.2% lead, and PassMark floating point math with a smaller 2.2% lead (144122 vs 141017). In PassMark single-thread, the Ryzen 9 edges out the EPYC with a 5.1% lead (4511 vs 4292), which is surprising given the EPYC’s massive lead in Cinebench single-core tests.

The EPYC demonstrates its strength in memory-intensive and I/O-heavy tasks. It leads in PassMark data compression by 8.4% (858105 vs 785811), data encryption by 22.2% (50708 vs 39446), and random string sorting by 19.1% (103202 vs 83497). It also wins PassMark integer math by 2.7% (228761 vs 222503) and PassMark multithread by 2.6% (64357 vs 62674). In Cinebench R15 multi-core, the Ryzen 9 takes a 7.8% lead (6042.5 vs 5603), but the EPYC wins Cinebench R15 single-core by a massive 58% (791 vs 332). PassMark extended instructions is nearly a tie, with the EPYC leading by just 0.5% (63136 vs 62813).

The Verdict

The data clearly separates these two chips by intended use case. The AMD EPYC 4564P is the superior choice for general server and workstation workloads that demand high clock speeds and strong multi-threaded performance. Its wins in Cinebench R23 multi-core, data compression, encryption, and random string sorting make it the better fit for database servers, content creation workstations, and any task that can take advantage of its 5.70 GHz boost clock and 170-watt power budget. The EPYC’s 72.5% lead in Cinebench R23 single-core is decisive for applications that rely on single-threaded responsiveness.

The AMD Ryzen 9 9955HX3D is a specialized part that wins in a narrower set of workloads. Its 43.8% lead in find prime numbers and 38.2% lead in physics suggest it has superior integer and physics processing capabilities, possibly due to its larger 128 MB L3 cache. It also wins in floating-point math and PassMark single-thread, but its overall average benchmark score is only 2.4% higher than the EPYC’s (97453 vs 95183). Given its 55-watt TDP, the Ryzen 9 is clearly designed for mobile systems where power efficiency is critical, but the benchmark data shows it cannot match the EPYC’s raw performance in most server-oriented tasks.

For a builder selecting a chip for a server or workstation where power consumption is not a primary constraint, the EPYC 4564P is the obvious choice. For a mobile platform or a system where the 55-watt TDP is a strict requirement, the Ryzen 9 9955HX3D offers competitive performance in specific workloads, but it will lag behind in the majority of multi-threaded and I/O-heavy tasks. The EPYC wins 9 benchmarks; the Ryzen 9 wins 6. The verdict is simple: choose the EPYC for general compute, choose the Ryzen 9 for its niche wins and mobile compatibility.