AMD EPYC 4345P vs AMD Ryzen 9 7900 Comparison

The AMD Ryzen 9 7900 and the AMD EPYC 4345P are both 65 W, Socket AM5 processors with integrated Radeon Graphics and ECC memory support, but they target different use cases. The Ryzen 9 7900 is a 12-core/24-thread desktop part built on Zen 4, while the EPYC 4345P is an 8-core/16-thread server/workstation chip on Zen 5. Benchmark data shows the Ryzen 9 7900 wins 15 of 17 head-to-head tests, often by large margins, but the EPYC 4345P takes the single-thread PassMark crown. Average benchmark scores are close: 50097 for the Ryzen 9 7900 versus 49595 for the EPYC 4345P, a 1% difference that puts each within 1% of the other in their nearestRivals lists.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD Ryzen 9 7900 has 12 cores and 24 threads, while the AMD EPYC 4345P has 8 cores and 16 threads.

Q: What is the performance difference in multi-threaded workloads?

A: The Ryzen 9 7900 leads by 28.3% in Cinebench R23 multi-core (41083 vs 32020) and by 28.3% in PassMark multi-thread (48347 vs 37671).

Q: Which CPU wins in single-thread performance?

A: The EPYC 4345P wins PassMark single-thread by 11.6% (4672 vs 4130), but the Ryzen 9 7900 wins Cinebench R23 single-core by 28.3% (5799 vs 4520).

Q: Are both CPUs on the same socket?

A: Yes, both use AMD Socket AM5 and support dual-channel DDR5 memory with Gen 5 PCIe (24 lanes CPU only).

Q: What are the architecture and process node differences?

A: The Ryzen 9 7900 uses Zen 4 (Raphael) on TSMC's 5 nm process, while the EPYC 4345P uses Zen 5 (Grado) on TSMC's 4 nm process.

Q: What is the launch MSRP of each?

A: The Ryzen 9 7900 has a launch MSRP of $429, and the EPYC 4345P has a launch MSRP of $329.

Where Each One Wins

The Ryzen 9 7900 dominates the benchmark suite across the board. It wins every Cinebench test (R15, R20, R23) in both single-core and multi-core variants by a consistent 28.3% margin. In PassMark workloads, the Ryzen 9 7900 takes data compression (577847 vs 430813, +34.1%), data encryption (34708 vs 22820, +52.1%), extended instructions (42253 vs 33544, +26%), find prime numbers (380 vs 194, +95.9%), floating point math (97943 vs 78059, +25.5%), integer math (164075 vs 124180, +32.1%), multithread (48347 vs 37671, +28.3%), physics (3059 vs 2480, +23.3%), and random string sorting (68474 vs 48448, +41.3%).

The EPYC 4345P wins only two tests, both identical: PassMark single_thread and singlethread, scoring 4672 versus 4130 for the Ryzen 9 7900, an 11.6% advantage. This is the sole bright spot for the EPYC in the data, but it is a meaningful one for lightly-threaded tasks that depend on raw per-core throughput.

For mixed workloads, the Ryzen 9 7900 is the clear all-rounder. The EPYC 4345P's single-thread PassMark win suggests an edge in certain latency-sensitive or single-threaded server tasks, but the Ryzen 9 7900's Cinebench single-core advantage complicates that picture. The data indicates the Ryzen 9 7900 is the safer choice for most compute-heavy scenarios, while the EPYC 4345P appeals specifically to workloads that favor its PassMark single-thread profile.

Architecture Differences

The two CPUs come from different Zen generations. The Ryzen 9 7900 is built on Zen 4 with the codename Raphael, while the EPYC 4345P uses Zen 5 with the codename Grado. This generational gap shows in the process node: the Ryzen 9 7900 uses TSMC's 5 nm process, and the EPYC 4345P uses TSMC's 4 nm process. The transistor counts reflect this: the Ryzen 9 7900 packs 13,140 million transistors across a 2x 71 mm² die, while the EPYC 4345P has 8,315 million transistors on a single 70.6 mm² die.

Cache layouts differ substantially. The Ryzen 9 7900 has 64 KB L1 per core, 1 MB L2 per core, and 64 MB shared L3. The EPYC 4345P has a larger 80 KB L1 per core, the same 1 MB L2 per core, but only 32 MB shared L3. This means the Ryzen 9 7900 offers double the total L3 cache, which likely contributes to its strong multi-threaded performance in data-heavy benchmarks.

The EPYC 4345P is classified as Server/Workstation, while the Ryzen 9 7900 is Desktop. Both have integrated Radeon Graphics and support ECC memory. The Ryzen 9 7900 has an unlocked multiplier, while the EPYC 4345P is locked. Both use dual-channel DDR5 memory, but the EPYC 4345P lists higher memory bandwidth at 89.6 GB/s versus 83.2 GB/s for the Ryzen 9 7900. The release dates differ: the Ryzen 9 7900 launched on 2023-01-13, and the EPYC 4345P on 2025-05-12.

Specification Differences

| Specification | AMD Ryzen 9 7900 | AMD EPYC 4345P |

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

| Cores | 12 | 8 |

| Threads | 24 | 16 |

| Base Clock | 3.70 GHz | 3.80 GHz |

| Boost Clock | 5.40 GHz | 5.50 GHz |

| Architecture | Zen 4 | Zen 5 |

| Codename | Raphael | Grado |

| Process Node | 5 nm | 4 nm |

| Transistors | 13,140 million | 8,315 million |

| Die Size | 2x 71 mm² | 70.6 mm² |

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

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

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

| Market Segment | Desktop | Server/Workstation |

| Release Date | 2023-01-13 | 2025-05-12 |

| Launch MSRP | $429 | $329 |

| Multiplier | Unlocked | Locked |

Both CPUs share the same socket (AM5), TDP (65 W), memory support (DDR5), memory bus (dual-channel), ECC support (true), PCIe configuration (Gen 5, 24 lanes CPU only), and integrated graphics (Radeon Graphics). The part numbers differ: 100-000000590 for the Ryzen 9 7900 and 100-000001556 for the EPYC 4345P.

Head-to-Head Benchmarks

The Ryzen 9 7900 wins every Cinebench test by exactly 28.3%. In Cinebench R15 multi-core, it scores 4140 versus 3227 for the EPYC 4345P; single-core is 584 versus 455. R20 multi-core shows 17254 against 13448, and single-core 2435 versus 1898. R23 multi-core is 41083 versus 32020, with single-core at 5799 versus 4520.

PassMark results show the Ryzen 9 7900's largest margins. The biggest single win is in find prime numbers, where it scores 380 versus 194, a 95.9% lead. Data encryption shows a 52.1% advantage (34708 vs 22820), and random string sorting is 41.3% ahead (68474 vs 48448). Integer math is 32.1% better (164075 vs 124180), data compression is 34.1% better (577847 vs 430813), and multithread is 28.3% better (48347 vs 37671). Floating point math is 25.5% ahead (97943 vs 78059), extended instructions 26% (42253 vs 33544), and physics 23.3% (3059 vs 2480).

The EPYC 4345P's only wins are PassMark single_thread and singlethread, both scoring 4672 versus 4130, an 11.6% margin. This is the sole category where the EPYC outperforms, and it stands in contrast to the Cinebench single-core results where the Ryzen 9 7900 leads by 28.3%. These conflicting single-thread results suggest the two benchmarks measure different aspects of per-core performance, with PassMark favoring the EPYC's Zen 5 architecture and Cinebench favoring the Ryzen's higher clock rates and cache configuration.

The average benchmark scores tell a similar story. The Ryzen 9 7900 averages 50097, placing it 1% ahead of the EPYC 4345P's 49595. In the nearestRivals data, the Ryzen 9 7900 is 1% ahead of the EPYC 4345P, while the EPYC 4345P is 1% behind the Ryzen 9 7900. Both sit at the 93rd percentile among all CPUs, indicating they are closely matched overall despite the Ryzen's dominance in individual tests.

The Verdict

The data makes this straightforward: choose the AMD Ryzen 9 7900 for almost any workload. It wins 15 of 17 head-to-head benchmarks, with margins ranging from 23.3% in PassMark physics to 95.9% in find prime numbers. The consistent 28.3% lead across all Cinebench tests, plus strong PassMark wins in compression, encryption, and math, makes it the superior multi-threaded processor. Its 12 cores versus 8, and 64 MB L3 versus 32 MB, are decisive advantages in the benchmark data.

The AMD EPYC 4345P is the pick only if your specific workload is measured by PassMark single-thread performance, where it leads by 11.6%. The data also shows it has a higher base clock (3.80 GHz vs 3.70 GHz) and boost clock (5.50 GHz vs 5.40 GHz), plus higher memory bandwidth (89.6 GB/s vs 83.2 GB/s), but these advantages do not translate into wins outside of PassMark single-thread. Its lower launch MSRP of $329 versus $429 for the Ryzen 9 7900 is a point in its favor, but the benchmark results show the Ryzen 9 7900 offers substantially more performance in nearly every measured category.

For a desktop builder, the Ryzen 9 7900 is the obvious choice. For a server or workstation buyer who specifically needs PassMark single-thread throughput, the EPYC 4345P has a niche. Otherwise, the Ryzen 9 7900's 15 wins out of 17 tests, including all Cinebench and most PassMark workloads, make it the data-backed recommendation for general and heavy compute tasks.