AMD EPYC 4345P vs AMD Ryzen 9 5900XT Comparison

Head-to-Head Benchmarks

The recorded data shows a clear pattern: the AMD Ryzen 9 5900XT dominates the AMD EPYC 4345P in the vast majority of benchmarks, taking 14 of 17 head-to-head tests. The margin is consistent across Cinebench and most PassMark workloads, with the Ryzen 9 landing 16.7% ahead in every Cinebench test: R15 multicore (3767 vs 3227), R15 singlecore (531 vs 455), R20 multicore (15696 vs 13448), R20 singlecore (2215 vs 1898), R23 multicore (37373 vs 32020), and R23 singlecore (5276 vs 4520). That uniformity suggests the Ryzen 9's advantage is structural, not workload-specific.

The largest wins for the Ryzen 9 come in PassMark data encryption, where it scores 37814 against 23313, a 62.2% gap. Integer math follows closely at 43.5% (177566 vs 123774), and data compression shows a 41.8% lead (597862 vs 421490). Floating point math is 33.9% ahead (99398 vs 74255), and random string sorting is 35.3% ahead (62537 vs 46238). Extended instructions and prime number finding are smaller but still decisive: 23.6% (39141 vs 31663) and 22.8% (205 vs 167), respectively. PassMark multithread confirms the trend at 21.3% (43810 vs 36123).

The EPYC 4345P takes only three wins, but two of them are notable. PassMark single-thread shows the EPYC at 4408 versus 3474 for the Ryzen 9, a 21.2% advantage that appears twice in the data (both passmark_single_thread and passmark_singlethread). The other EPYC win is PassMark physics, where it scores 2583 against 1715, a 33.6% lead. Physics is the only test where the EPYC wins by more than it loses elsewhere; the single-thread margin is roughly comparable to the Ryzen 9's typical lead in other workloads.

Where Each One Wins

The Ryzen 9 5900XT is the clear choice for multithreaded productivity and content-creation workloads. Its Cinebench R23 multicore score of 37373 versus 32020 translates to a 16.7% edge in rendering, and the PassMark data encryption result (62.2% ahead) points to strong performance in security-sensitive tasks like disk encryption or VPN throughput. The 41.8% lead in data compression and 43.5% lead in integer math make it suitable for archival tools, database operations, and general number crunching. The 33.9% advantage in floating point math covers scientific computing and simulation tasks.

The EPYC 4345P's wins are narrower in scope, but they matter for specific use cases. The 21.2% single-thread advantage (4408 vs 3474) means it handles lightly threaded applications, legacy software, and tasks that cannot scale across cores with noticeably better responsiveness. The 33.6% physics win (2583 vs 1715) is interesting because physics simulations often rely on a mix of single-thread speed and specific instruction patterns; the EPYC's higher boost clock appears to help there. For a server environment running many small, independent workloads or a workstation running single-threaded engineering tools, the EPYC's single-thread edge is the selling point.

It is worth noting the EPYC's passmark_multithread score of 36123 is still respectable, but it trails the Ryzen 9 by 21.3%. The EPYC does not lose in every multithreaded scenario; rather, it loses by a smaller margin in some (Cinebench) and a larger margin in others (encryption, integer math). That split suggests the EPYC is more competitive in balanced, real-world server loads than in specialized compute bursts.

Architecture Differences

The two CPUs come from different generations and target different sockets. The Ryzen 9 5900XT is a Zen 3 part, codenamed Vermeer, built on TSMC's 7 nm process with 8,300 million transistors across a dual-die design (2x 74 mm²). It uses 16 cores and 32 threads, with a base clock of 3.30 GHz and boost clock of 4.80 GHz, and a 105 W TDP. The EPYC 4345P is Zen 5, codenamed Grado, fabricated on TSMC's 4 nm node with 8,315 million transistors in a single 70.6 mm² die. It offers 8 cores and 16 threads, with a higher base clock of 3.80 GHz and boost clock of 5.50 GHz, but a lower 65 W TDP.

Cache layout differs significantly. The Ryzen 9 has 64 KB L1 per core, 512 KB L2 per core, and 64 MB L3. The EPYC has larger per-core caches: 80 KB L1 per core and 1 MB L2 per core, but only 32 MB of shared L3. The Ryzen 9's larger L3 pool likely helps in the multithreaded workloads where it excels, while the EPYC's bigger L2 per core supports its single-thread performance.

Memory and I/O also diverge. The Ryzen 9 supports DDR4 with dual-channel memory and 51.2 GB/s bandwidth. The EPYC supports DDR5 with dual-channel memory and 89.6 GB/s bandwidth. Both support ECC memory, which is expected given the EPYC's server positioning, but the Ryzen 9 also includes it. PCIe connectivity favors the EPYC: Gen 5 with 24 lanes (CPU only) versus Gen 4 with 20 lanes (CPU only) for the Ryzen 9. The EPYC also integrates Radeon Graphics, while the Ryzen 9 has no integrated graphics.

The socket situation is a practical divider: the Ryzen 9 uses AMD Socket AM4, while the EPYC uses AMD Socket AM5. That means motherboard compatibility is entirely separate. The Ryzen 9 has an unlocked multiplier; the EPYC does not. The Ryzen 9's release date is 2024-07-30, while the EPYC's is 2025-05-12, so the EPYC is the newer design by roughly ten months.

The Verdict

From the data alone, the AMD Ryzen 9 5900XT is the better all-around processor. It wins 14 of 17 head-to-head tests, and its margins in encryption (62.2%), integer math (43.5%), and compression (41.8%) are large enough to define its character as a compute-focused part. Its 16.7% lead across all Cinebench versions shows that rendering and heavy multithreaded tasks are firmly in its court. The average benchmark score of 50718 for the Ryzen 9 versus 48470 for the EPYC, combined with both sitting at the 90th percentile, confirms that the Ryzen 9 is the stronger performer overall.

The EPYC 4345P is not without merit. Its 21.2% single-thread lead and 33.6% physics advantage mean that for workloads which are latency-sensitive or which rely on a single fast core, it will feel snappier. The lower 65 W TDP also makes it an efficient choice for dense server deployments, and the DDR5 support with 89.6 GB/s bandwidth plus Gen 5 PCIe gives it a modern platform edge. But its 8-core, 16-thread configuration cannot match the Ryzen 9's 16-core, 32-thread throughput in most measured scenarios.

Who should pick which? Strictly from the benchmarks, a builder prioritizing multithreaded performance, content creation, or data-heavy tasks should choose the Ryzen 9 5900XT. A buyer running many independent single-threaded services, or who needs integrated graphics and a newer socket with Gen 5 PCIe, should consider the EPYC 4345P. The Ryzen 9 is the faster CPU; the EPYC is the more modern platform with a single-thread edge.

FAQ

Q: Which CPU wins in Cinebench R23 multicore?

A: The AMD Ryzen 9 5900XT scores 37373, which is 16.7% ahead of the AMD EPYC 4345P's 32020.

Q: Does the EPYC 4345P win any benchmark?

A: Yes, it wins PassMark physics (2583 vs 1715, a 33.6% lead) and PassMark single-thread (4408 vs 3474, a 21.2% lead), the latter recorded in two identical test entries.

Q: What is the biggest performance gap between the two?

A: The largest difference is in PassMark data encryption, where the Ryzen 9 5900XT scores 37814 versus 23313 for the EPYC 4345P, a 62.2% advantage.

Q: Which CPU has more cores and threads?

A: The Ryzen 9 5900XT has 16 cores and 32 threads, while the EPYC 4345P has 8 cores and 16 threads.

Q: What memory types do they support?

A: The Ryzen 9 5900XT supports DDR4 with dual-channel memory and 51.2 GB/s bandwidth. The EPYC 4345P supports DDR5 with dual-channel memory and 89.6 GB/s bandwidth. Both support ECC memory.

Q: Are they on the same socket?

A: No. The Ryzen 9 5900XT uses AMD Socket AM4, while the EPYC 4345P uses AMD Socket AM5.

Specification Differences

| Specification | AMD Ryzen 9 5900XT | AMD EPYC 4345P |

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

| Cores | 16 | 8 |

| Threads | 32 | 16 |

| Base Clock | 3.30 GHz | 3.80 GHz |

| Boost Clock | 4.80 GHz | 5.50 GHz |

| TDP | 105 W | 65 W |

| Socket | AMD Socket AM4 | AMD Socket AM5 |

| Architecture | Zen 3 | Zen 5 |

| Codename | Vermeer | Grado |

| Process Node | 7 nm | 4 nm |

| Transistors | 8,300 million | 8,315 million |

| Die Size | 2x 74 mm² | 70.6 mm² |

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

| L2 Cache | 512 KB (per core) | 1 MB (per core) |

| L3 Cache | 64 MB | 32 MB (shared) |

| Memory Support | DDR4 | DDR5 |

| Memory Bus | Dual-channel | Dual-channel |

| Memory Bandwidth | 51.2 GB/s | 89.6 GB/s |

| ECC Memory | Yes | Yes |

| PCIe | Gen 4, 20 Lanes (CPU only) | Gen 5, 24 Lanes (CPU only) |

| Integrated Graphics | N/A | Radeon Graphics |

| Market Segment | Desktop | Server/Workstation |

| Multiplier Unlocked | Yes | No |

| Release Date | 2024-07-30 | 2025-05-12 |

| Launch MSRP | $349 | $329 |