AMD EPYC 7543 vs AMD EPYC 9254 Comparison

AMD EPYC 9254 and AMD EPYC 7543 are both active server/workstation processors from AMD, but they target different generations and platforms. The EPYC 9254 belongs to the EPYC 9004 series (Zen 4 Genoa), while the EPYC 7543 is part of the EPYC 7003 series (Zen 3 Milan). Benchmark data reveals a consistent, if modest, performance advantage for the newer EPYC 9254 across all tested Cinebench workloads, despite the EPYC 7543 offering more cores and threads. The following analysis breaks down the head-to-head results, architectural differences, and key specifications to help determine which processor suits specific workloads based solely on the provided data.

Head-to-Head Benchmarks

The EPYC 9254 wins all six head-to-head Cinebench comparisons against the EPYC 7543, but the margins are remarkably consistent and narrow. In multi-core tests, the EPYC 9254 scores 5,490 in Cinebench R15 multi-core versus 5,393 for the EPYC 7543, a 1.8% advantage. That same 1.8% delta appears in Cinebench R20 multi-core (22,878 vs 22,473) and Cinebench R23 multi-core (54,473 vs 53,509). The consistency of the 1.8% delta across all three multi-core tests suggests the performance gap is largely driven by architectural efficiency rather than workload-specific scaling.

Single-core results paint a similar picture, with the EPYC 9254 leading by 1.7% in Cinebench R15 single-core (774 vs 761) and by 1.8% in both Cinebench R20 single-core (3,229 vs 3,172) and Cinebench R23 single-core (7,690 vs 7,554). The EPYC 9254's higher boost clock of 4.15 GHz versus 3.70 GHz on the EPYC 7543 contributes to this edge, but the fact that the delta remains at 1.8% even in multi-core tests—where the EPYC 7543's 32 cores should theoretically provide a raw throughput advantage over the EPYC 9254's 24 cores—highlights the Zen 4 architecture's superior instructions-per-clock (IPC) efficiency.

It is worth remembering the EPYC 7543's higher core count (32 vs 24) does not translate into a multi-core win. The EPYC 9254's average benchmark score of 15,756 versus 15,477 for the EPYC 7543 (a 1.8% difference) confirms that the newer architecture overcomes the core-count deficit. The EPYC 9254's nearest rival, the AMD EPYC 9354P, scores 15,826 (a -0.4% delta), placing the 9254 in a tightly contested performance cluster. The EPYC 7543, meanwhile, sits near the AMD Ryzen 3 7440U (15,682, a -1.3% delta) and Intel Core i5-11400H (15,749, a -1.7% delta), showing that its performance tier is comparable to very different processor classes.

Architecture Differences

The two CPUs represent distinct architectural generations. The EPYC 9254 uses Zen 4 architecture (codename Genoa) built on a 5 nm process at TSMC, while the EPYC 7543 uses Zen 3 architecture (codename Milan) on a 7 nm process, also from TSMC. This process shrink contributes to the EPYC 9254's ability to achieve higher clock speeds—2.90 GHz base and 4.15 GHz boost versus 2.80 GHz base and 3.70 GHz boost for the EPYC 7543—while maintaining a lower TDP of 200 W compared to 225 W.

The transistor counts and die configurations differ substantially. The EPYC 9254 features 26,280 million transistors across a die size of 4x 72 mm², whereas the EPYC 7543 packs 33,200 million transistors into a die size of 8x 81 mm². The larger number of smaller dies on the EPYC 7543 reflects the older chiplet design, while the EPYC 9254's four-die layout with fewer total transistors but newer process technology explains its efficiency gains.

Cache hierarchies also diverge. Both CPUs share 64 KB of L1 cache per core, but the L2 cache differs: the EPYC 9254 has 1 MB per core, while the EPYC 7543 has 512 KB per core. The L3 cache is a major differentiator, with the EPYC 9254 providing 128 MB shared and the EPYC 7543 offering 256 MB shared. Despite having half the L3 cache, the EPYC 9254 still outperforms in benchmarks, indicating that the larger cache on the EPYC 7543 cannot compensate for the older architecture's lower efficiency.

Memory support is another fundamental divergence. The EPYC 9254 uses DDR5 memory over a twelve-channel bus, delivering 460.8 GB/s of bandwidth. The EPYC 7543 relies on DDR4 over an eight-channel bus, capping at 204.8 GB/s. Both support ECC memory, but the EPYC 9254's more than double memory bandwidth is a critical advantage for memory-intensive workloads. PCIe connectivity also advances: the EPYC 9254 offers Gen 5 with 128 lanes (CPU only), while the EPYC 7543 provides Gen 4 with the same 128 lanes (CPU only).

FAQ

Q: Which CPU has a higher core count?

A: The AMD EPYC 7543 has 32 cores and 64 threads, while the AMD EPYC 9254 has 24 cores and 48 threads. Despite having 8 fewer cores, the EPYC 9254 wins all multi-core benchmarks.

Q: How do their boost clocks compare?

A: The EPYC 9254 boosts to 4.15 GHz, which is higher than the EPYC 7543's boost of 3.70 GHz. This contributes to the 9254's single-core performance lead of 1.8% in Cinebench R23.

Q: What is the memory bandwidth difference?

A: The EPYC 9254 supports DDR5 with a twelve-channel bus, providing 460.8 GB/s of bandwidth. The EPYC 7543 uses DDR4 over an eight-channel bus, offering 204.8 GB/s—less than half the bandwidth of the 9254.

Q: Which CPU has more L3 cache?

A: The EPYC 7543 has 256 MB of shared L3 cache, double the 128 MB on the EPYC 9254. However, the EPYC 9254 still outperforms in all benchmarks, suggesting the larger cache does not offset the older architecture.

Q: Are both CPUs on the same socket?

A: No. The EPYC 9254 uses AMD Socket SP5, while the EPYC 7543 uses AMD Socket SP3. They are not interchangeable in the same motherboard.

Q: What is the TDP of each processor?

A: The EPYC 9254 has a TDP of 200 W, while the EPYC 7543 has a TDP of 225 W. The EPYC 9254 delivers higher performance with a 25 W lower TDP, indicating better power efficiency.

The Verdict

The benchmark data is unambiguous: the AMD EPYC 9254 outperforms the AMD EPYC 7543 in every tested workload, with a consistent 1.8% lead in multi-core tests and a 1.7-1.8% lead in single-core tests. This is notable because the EPYC 7543 has 33% more cores (32 vs 24) and double the L3 cache (256 MB vs 128 MB). The EPYC 9254's advantages stem from its Zen 4 architecture on a 5 nm process, higher clock speeds (4.15 GHz boost vs 3.70 GHz), and significantly faster memory (460.8 GB/s DDR5 vs 204.8 GB/s DDR4).

For workloads that are latency-sensitive or heavily dependent on single-thread performance, the EPYC 9254 is the clear choice. Its higher boost clock and superior IPC deliver better results in Cinebench R15 single-core (774 vs 761) and R23 single-core (7,690 vs 7,554). For multi-threaded applications, the EPYC 9254 still wins despite fewer cores, indicating that its architectural efficiency more than compensates for the core deficit. The lower TDP of 200 W versus 225 W also makes the EPYC 9254 more power-efficient per unit of performance.

However, the EPYC 7543 remains relevant in specific scenarios. Its 256 MB of L3 cache could benefit workloads with very large working sets that fit into cache, and its 32 cores provide a theoretical advantage for highly parallel tasks that scale with core count. The EPYC 7543 also uses DDR4 memory, which may be more cost-effective for platforms already invested in that ecosystem, and its Socket SP3 compatibility might suit existing server infrastructure. Yet, based strictly on the Cinebench results, there is no benchmark where the EPYC 7543 wins. The EPYC 9254 is the superior processor across the board, and the only reason to choose the EPYC 7543 would be platform compatibility or the need for more cores in a memory-bandwidth-limited setting where the 9254's advantages are less critical.

Specification Differences

| Specification | AMD EPYC 9254 | AMD EPYC 7543 |

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

| Cores | 24 | 32 |

| Threads | 48 | 64 |

| Base Clock | 2.90 GHz | 2.80 GHz |

| Boost Clock | 4.15 GHz | 3.70 GHz |

| TDP | 200 W | 225 W |

| Socket | AMD Socket SP5 | AMD Socket SP3 |

| Architecture | Zen 4 | Zen 3 |

| Codename | Genoa | Milan |

| Process Node | 5 nm | 7 nm |

| Transistors | 26,280 million | 33,200 million |

| Die Size | 4x 72 mm² | 8x 81 mm² |

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

| L3 Cache | 128 MB (shared) | 256 MB (shared) |

| Memory Support | DDR5 | DDR4 |

| Memory Bus | Twelve-channel | Eight-channel |

| Memory Bandwidth | 460.8 GB/s | 204.8 GB/s |

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

| Release Date | 2022-11-09 | 2021-03-14 |

| Launch MSRP | $2299 | $3761 |