AMD EPYC 4564P vs AMD Ryzen 9 PRO 9945 Comparison

# AMD Ryzen 9 PRO 9945 vs AMD EPYC 4564P

The AMD Ryzen 9 PRO 9945 and AMD EPYC 4564P are both active server/workstation processors on the same AMD Socket AM5 platform, but they target different corners of the market. The Ryzen 9 PRO 9945 is a 12-core Zen 5 part built on a 4nm node, while the EPYC 4564P is a 16-core Zen 4 chip on a 5nm node. Benchmark data shows the EPYC wins 9 of 11 head-to-head tests, yet the Ryzen takes a clear single-thread lead — and the average scores are closer than the core counts suggest. The Ryzen 9 PRO 9945 posts an average benchmark score of 96083, while the EPYC 4564P sits at 95183, a difference of only 0.9%.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 4564P has 16 cores and 32 threads, while the AMD Ryzen 9 PRO 9945 has 12 cores and 24 threads. The EPYC also runs higher base and boost clocks (4.50 GHz base, 5.70 GHz boost) versus the Ryzen's 3.40 GHz base and 5.40 GHz boost.

Q: How do their average benchmark scores compare?

A: The Ryzen 9 PRO 9945 has an average benchmark score of 96083, which is 0.9% higher than the EPYC 4564P's 95183. Both sit at the 96th percentile among all CPUs, so they are effectively in the same performance tier overall.

Q: Which chip wins in single-threaded performance?

A: The Ryzen 9 PRO 9945 wins the PassMark single-thread test with a score of 4619, beating the EPYC 4564P's 4292 by 7.6%. This is the Ryzen's only clear win in the head-to-head data.

Q: What is the biggest benchmark gap between them?

A: The largest gap is in PassMark data compression, where the EPYC 4564P scores 858105 versus the Ryzen's 579972 — a 32.4% deficit for the Ryzen. The EPYC also leads by 40% in data encryption (50708 vs 30450).

Q: Do both processors support ECC memory?

A: Yes, both the AMD Ryzen 9 PRO 9945 and the AMD EPYC 4564P support ECC memory. Both also support DDR5 memory and include Radeon Graphics integrated.

Q: What is the release timing difference?

A: The EPYC 4564P was released on 2024-05-20, while the Ryzen 9 PRO 9945 came later on 2025-09-15. The EPYC has a launch MSRP of $699, while the Ryzen's launch MSRP is not listed in the data.

Architecture Differences

The two processors come from different Zen generations and manufacturing nodes. The Ryzen 9 PRO 9945 is built on Zen 5 (Granite Ridge) using TSMC's 4nm process, packing 16,630 million transistors across a dual-die design with each die measuring 70.6 mm². The EPYC 4564P uses Zen 4 (Raphael) on TSMC's 5nm node, with 13,140 million transistors on two 71 mm² dies. The newer node gives the Ryzen a density advantage, but the EPYC compensates with more cores and higher clocks.

Cache layouts differ notably. The Ryzen 9 PRO 9945 has 80 KB of L1 cache per core and 1 MB of L2 per core, with a 64 MB L3 cache. The EPYC 4564P has 64 KB of L1 per core, 1 MB of L2 per core, and 64 MB of shared L3. Both have the same total L3 capacity, but the EPYC's is explicitly shared while the Ryzen's is not labeled as such in the data.

Memory bandwidth favors the Ryzen slightly: it supports dual-channel DDR5 with 89.6 GB/s bandwidth, while the EPYC 4564P also uses dual-channel DDR5 but at 83.2 GB/s. The EPYC pulls ahead on PCIe lanes, offering 28 Gen 5 lanes (CPU only) versus the Ryzen's 24 Gen 5 lanes.

Both chips are locked (multiplier unlocked: false), use the same AM5 socket, and have identical market segments (Server/Workstation). The EPYC's TDP of 170 W is substantially higher than the Ryzen's 65 W, reflecting its higher core count and clock speeds.

Where Each One Wins

The EPYC 4564P dominates in heavily threaded and data-intensive workloads. It wins all seven PassMark multithreaded tests tracked in the head-to-head data, including data compression (858105 vs 579972), integer math (228761 vs 171175), and floating point math (141017 vs 107340). The 16-core, 32-thread configuration with higher clocks (4.50 GHz base, 5.70 GHz boost) clearly pays off in parallel tasks.

The Ryzen 9 PRO 9945 wins in single-threaded scenarios. Its PassMark single-thread score of 4619 beats the EPYC's 4292 by 7.6%. This comes from the newer Zen 5 architecture and the 5.40 GHz boost clock, despite having fewer cores and a lower base clock of 3.40 GHz. For workloads that rely on per-core performance — legacy applications, lightly threaded code, or interactive responsiveness — the Ryzen holds the edge.

The data shows a clear split: the EPYC is the throughput king, while the Ryzen is the responsiveness specialist. The EPYC's wins range from 6.3% (find prime numbers, 365 vs 342) to 40% (data encryption, 50708 vs 30450). The Ryzen's only win is the 7.6% single-thread advantage.

Specification Differences

| Specification | AMD Ryzen 9 PRO 9945 | AMD EPYC 4564P |

|---|---|---|

| Cores | 12 | 16 |

| Threads | 24 | 32 |

| Base Clock | 3.40 GHz | 4.50 GHz |

| Boost Clock | 5.40 GHz | 5.70 GHz |

| TDP | 65 W | 170 W |

| Architecture | Zen 5 (Granite Ridge) | Zen 4 (Raphael) |

| Process Node | 4 nm | 5 nm |

| Transistors | 16,630 million | 13,140 million |

| Die Size | 2x 70.6 mm² | 2x 71 mm² |

| L1 Cache | 80 KB (per core) | 64 KB (per core) |

| L3 Cache | 64 MB | 64 MB (shared) |

| Memory Bandwidth | 89.6 GB/s | 83.2 GB/s |

| PCIe Lanes | Gen 5, 24 Lanes (CPU only) | Gen 5, 28 Lanes (CPU only) |

| Release Date | 2025-09-15 | 2024-05-20 |

| Launch MSRP | Not listed | $699 |

| Part Number | 100-000001407 | 100-000001476 |

Both support DDR5 memory, dual-channel memory bus, ECC memory, Radeon Graphics, and share the AM5 socket. Neither is multiplier unlocked.

Head-to-Head Benchmarks

The EPYC 4564P wins 9 of 11 head-to-head tests, and the margins are often large. Data compression shows the biggest gap: the EPYC scores 858105, beating the Ryzen's 579972 by 32.4%. Data encryption is even more lopsided proportionally — the EPYC's 50708 beats the Ryzen's 30450 by 40%. Random string sorting also heavily favors the EPYC, with 103202 versus 62458, a 39.5% difference.

The multithread test tells a similar story. The EPYC scores 64357, which is 24.4% ahead of the Ryzen's 48664. Integer math follows with the EPYC at 228761 versus 171175 (25.2% lead), and floating point math shows 141017 versus 107340 (23.9% lead). Extended instructions go to the EPYC at 63136 versus 44374 (29.7% lead). Even the closer tests favor the EPYC: physics (3392 vs 2902, 14.4% lead) and find prime numbers (365 vs 342, 6.3% lead).

The Ryzen's only head-to-head wins come in the single-thread tests, which appear twice in the data (passmark_single_thread and passmark_singlethread, both with identical scores). The Ryzen's 4619 beats the EPYC's 4292 by 7.6%. This is a meaningful margin, but it's a single data point against nine EPYC wins. The EPYC also holds a lead in average benchmark score among their nearest rivals — the EPYC 4564P's nearest rival data shows the Ryzen at -0.9% delta, while the Ryzen's data shows the EPYC at +0.9% delta, confirming they are closely matched overall.

The Verdict

The data points to a clear choice based on workload type. The AMD EPYC 4564P is the pick for parallel, multithreaded, or data-intensive work. It wins every multithreaded benchmark in the head-to-head set, with leads ranging from 6.3% to 40%. Its 16 cores, 32 threads, and higher base and boost clocks make it the stronger throughput option. If your tasks involve compression, encryption, sorting large datasets, or heavy integer/floating-point math, the EPYC is the data-backed winner.

The AMD Ryzen 9 PRO 9945 is the pick for single-threaded performance. Its 7.6% lead in the PassMark single-thread test over the EPYC is the only head-to-head win it records, but it's a meaningful one for workloads that scale poorly across cores. The Zen 5 architecture and 5.40 GHz boost clock deliver per-core speed that the Zen 4 EPYC cannot match. The Ryzen also runs at a much lower 65 W TDP versus the EPYC's 170 W, and offers slightly higher memory bandwidth (89.6 GB/s vs 83.2 GB/s).

The average benchmark scores are nearly identical — 96083 for the Ryzen versus 95183 for the EPYC, a 0.9% difference — and both sit at the 96th percentile. This means the choice comes down to whether you need many cores or fast single-core execution. The EPYC 4564P, with its launch MSRP of $699, is the established server part from 2024. The Ryzen 9 PRO 9945, released in 2025, brings the newer architecture. If the data is the guide: EPYC for throughput, Ryzen for single-thread responsiveness.