AMD EPYC 7643P vs AMD EPYC 9354 Comparison

Head-to-Head Benchmarks

The head-to-head data shows a clear overall winner in the AMD EPYC 7643P, which takes 14 of the 17 recorded benchmark comparisons. The margin is not uniform, however. The most decisive win for the 7643P comes in PassMark data encryption, where it scores 95,606 against 71,400 for the EPYC 9354, a 33.9% advantage. That is the single largest delta in either direction across the entire test suite.

The 7643P also dominates integer-heavy workloads. In PassMark integer math, it posts 390,775 versus 304,828, a 28.2% lead. Floating point math shows a similar pattern: 216,592 against 188,894, which is 14.7% ahead. Random string sorting goes to the 7643P by 13.9% (160,274 versus 140,690), and data compression favors it by 13.5% (1,326,051 versus 1,168,626).

The Cinebench suite is consistent but narrower. Across all six Cinebench tests, the 7643P wins by either 6.4% or 6.5%. Multicore R23 shows 65,710 versus 61,722, a 6.5% edge. Single-core R23 is 9,276 versus 8,713, also 6.5%. The same 6.5% delta appears in R20 multicore (27,598 versus 25,923) and R15 multicore (6,623 versus 6,221). Single-core margins are 6.4% in both R20 and R15. PassMark multithread rounds out the pattern: 77,307 versus 72,615, a 6.5% win.

The EPYC 9354 does strike back in three specific tests, and these are worth attention because they are not marginal. The biggest reversal is PassMark find prime numbers: 934 versus 651, a 30.3% victory for the 9354. PassMark extended instructions also goes to the 9354 by 21.8% (86,176 versus 67,398), and PassMark physics shows an 13.8% lead (9,281 versus 8,002). Notably, the 9354 wins both PassMark single-thread tests by just 2.1% (2,655 versus 2,601), meaning the 7643P still holds the single-core Cinebench advantage despite the 9354's higher boost clock.

The average benchmark scores place the 7643P at 144,824, which ranks in the 98th percentile against all CPUs. Its nearest rival in the database is the Intel Xeon w9-3575X at 144,323, a 0.3% gap, and the AMD Ryzen 9 PRO 9965 at 145,728, which is 0.6% ahead. The 9354 averages 126,810, good for the 97th percentile. Its closest rival is the Intel Xeon 6710E at 129,930, which is 2.4% ahead, while the Intel Xeon 6730P trails by 1.6%.

The Verdict

The data supports a straightforward recommendation. If your workload is broad, mixed, or heavily threaded, the AMD EPYC 7643P is the stronger processor. It wins the majority of tests, and its leads in encryption, integer math, and compression are large enough to matter in real deployments. The 14 wins out of 17 benchmarks, combined with a higher average score (144,824 versus 126,810) and a higher percentile ranking (98 versus 97), make it the default choice for general server and workstation use.

The AMD EPYC 9354 is the pick only when your specific workload matches its three wins. Prime number finding, extended instruction sets, and physics simulation are the areas where it leads, and in prime numbers and extended instructions, the margins are substantial. If those tasks dominate your compute profile, the 9354's 30.3% and 21.8% advantages respectively are enough to justify choosing it over the 7643P. For everything else, the 7643P is the safer bet.

Consider the platform implications as well. The 7643P uses AMD Socket SP3 and DDR4 memory, while the 9354 uses AMD Socket SP5 and DDR5. These are not interchangeable platforms. The choice of CPU implies a choice of motherboard, memory type, and overall system architecture. The 7643P's 48 cores and 96 threads give it a core-count advantage that shows up clearly in multithreaded benchmarks, while the 9354's 32 cores and 64 threads rely on higher clocks and architectural efficiency to compete.

Architecture Differences

The two processors come from different generations and use different core designs. The AMD EPYC 7643P is built on Zen 3 architecture, codenamed Milan, and belongs to the EPYC 7003 series. It is manufactured on a 7 nm process at TSMC, with 33,200 million transistors across 8 dies of 81 mm² each. The AMD EPYC 9354 uses Zen 4 architecture, codenamed Genoa, from the EPYC 9004 series. It is built on a 5 nm process at TSMC, with 52,560 million transistors across 8 dies of 72 mm² each. The 9354 packs more transistors into smaller dies, which reflects the denser 5 nm node.

Cache organization differs in the L2, though L1 and L3 are identical in capacity. Both have 64 KB of L1 per core and 256 MB of shared L3. The 7643P has 512 KB of L2 per core, while the 9354 doubles that to 1 MB per core. With fewer cores, the 9354's larger per-core L2 gives each core more private cache.

Clock speeds favor the 9354. Its base clock is 3.25 GHz and boost clock is 3.80 GHz, compared to 2.30 GHz base and 3.60 GHz boost for the 7643P. The 9354 also has a higher TDP at 280 watts versus 225 watts. Despite the higher clocks, the 7643P wins most single-threaded benchmarks, which suggests the IPC and cache configuration of the 7643P compensate for its lower boost frequency in the recorded tests.

Memory architecture is a major differentiator. The 7643P supports DDR4 with an eight-channel memory bus and 204.8 GB/s of bandwidth. The 9354 supports DDR5 with a twelve-channel memory bus and 460.8 GB/s of bandwidth. That is more than double the theoretical memory bandwidth, which matters for memory-bound workloads even if the benchmark suite does not isolate it directly.

PCIe capabilities also differ by generation. The 7643P offers PCIe Gen 4 with 128 lanes (CPU only). The 9354 offers PCIe Gen 5 with 128 lanes (CPU only). Lane count is identical, but the newer generation doubles the per-lane bandwidth. Both support ECC memory, and neither has integrated graphics. Both are locked (multiplier not unlocked) and target the Server/Workstation market segment.

The release dates differ notably. The 9354 launched on 2022-11-09, while the 7643P launched on 2023-09-04. The 7643P is the newer product despite using the older Zen 3 architecture. The part numbers are 100-000001285 for the 7643P and 100-100000798 for the 9354.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD EPYC 7643P has 48 cores and 96 threads. The AMD EPYC 9354 has 32 cores and 64 threads.

Q: Which processor is faster in single-core performance?

A: The 7643P wins all three single-core Cinebench tests by 6.4% to 6.5%, and both PassMark single-thread tests by 2.1%. The 9354 has a higher boost clock (3.80 GHz versus 3.60 GHz), but the recorded scores favor the 7643P.

Q: What is the largest benchmark margin between the two?

A: The 7643P leads by 33.9% in PassMark data encryption (95,606 versus 71,400). The 9354 leads by 30.3% in PassMark find prime numbers (934 versus 651).

Q: How does memory support differ?

A: The 7643P uses DDR4 with an eight-channel memory bus and 204.8 GB/s bandwidth. The 9354 uses DDR5 with a twelve-channel memory bus and 460.8 GB/s bandwidth. Both support ECC memory.

Q: Do they use the same socket?

A: No. The 7643P uses AMD Socket SP3, while the 9354 uses AMD Socket SP5. They are not compatible with the same motherboards.

Q: Which CPU has the higher average benchmark score?

A: The 7643P averages 144,824 and ranks in the 98th percentile. The 9354 averages 126,810 and ranks in the 97th percentile.

Where Each One Wins

Choose the AMD EPYC 7643P for general server workloads, heavily threaded applications, and any task that benefits from more cores. It wins all six Cinebench tests, PassMark multithread, integer math, floating point math, data compression, data encryption, and random string sorting. The 28.2% lead in integer math and 33.9% lead in encryption make it particularly strong for database work, cryptographic operations, and compression pipelines. Its 48 cores give it a raw throughput advantage that the 9354 cannot offset in most tests.

Choose the AMD EPYC 9354 for workloads that map to its three wins. PassMark find prime numbers shows a 30.3% advantage, which indicates superior performance in prime-focused or possibly single-threaded integer loops despite the overall integer math loss. PassMark extended instructions shows a 21.8% lead, suggesting better execution of advanced or specialized instruction sequences. PassMark physics shows a 13.8% lead, which points to better performance in physics simulation or similar floating-point-heavy but latency-sensitive tasks. The 9354 also offers DDR5 memory with 460.8 GB/s bandwidth and PCIe Gen 5, which may benefit workloads that are memory-bandwidth-bound or need newer I/O capabilities, even though those advantages are not directly measured in the benchmark suite.

The 7643P is the better all-rounder. The 9354 is a specialist that earns its place only in environments where its specific strengths align with the dominant workload. The core count difference is the primary driver: 48 cores versus 32 cores gives the 7643P a structural advantage in parallel throughput, and the benchmark data confirms that advantage across most test categories.

Specification Differences

| Specification | AMD EPYC 7643P | AMD EPYC 9354 |

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

| Series | EPYC 7003 series | EPYC 9004 series |

| Cores | 48 | 32 |

| Threads | 96 | 64 |

| Base clock | 2.30 GHz | 3.25 GHz |

| Boost clock | 3.60 GHz | 3.80 GHz |

| TDP | 225 W | 280 W |

| Socket | AMD Socket SP3 | AMD Socket SP5 |

| Architecture | Zen 3 | Zen 4 |

| Codename | Milan | Genoa |

| Process node | 7 nm | 5 nm |

| Transistors | 33,200 million | 52,560 million |

| Die size | 8x 81 mm² | 8x 72 mm² |

| L1 cache | 64 KB (per core) | 64 KB (per core) |

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

| L3 cache | 256 MB (shared) | 256 MB (shared) |

| Memory support | DDR4 | DDR5 |

| Memory bus | Eight-channel | Twelve-channel |

| Memory bandwidth | 204.8 GB/s | 460.8 GB/s |

| ECC memory | Yes | Yes |

| PCIe | Gen 4, 128 Lanes (CPU only) | Gen 5, 128 Lanes (CPU only) |

| Release date | 2023-09-04 | 2022-11-09 |

| Launch MSRP | $2722 | $3420 |

| Part number | 100-000001285 | 100-100000798 |

| Multiplier unlocked | No | No |