AMD EPYC 7C13 vs AMD EPYC 9455P Comparison

Head-to-Head Benchmarks

The benchmark data is unambiguous: the AMD EPYC 9455P wins every single head-to-head comparison against the AMD EPYC 7C13, 17 wins to zero. This is not a close contest. The most dramatic gap appears in PassMark physics, where the 9455P scores 17,315 against 4,904 for the 7C13, a 253.1% advantage. That result signals a fundamental difference in per-core efficiency that shows up across nearly every workload.

In Cinebench, the 9455P holds a consistent 52.9% lead across all six tests. The R23 multicore score of 99,206 versus 64,873, and the single-core result of 14,005 versus 9,158, both reflect that same margin. The consistency of the 52.9% delta across R15, R20, and R23, in both single and multicore, suggests the advantage is architectural rather than workload-specific. The 9455P is not just faster in parallel tasks; it is equally faster per thread.

The PassMark suite reveals where the gap widens or narrows. Extended instructions show a 61.7% delta (137,485 vs. 85,034), and random string sorting shows an 84.8% delta (242,701 vs. 131,361). The find-prime-numbers test more than doubles the older chip, 1,107 vs. 539, a 105.4% difference. Floating point math lands at 34.1% ahead (357,783 vs. 266,846), while integer math is closer at 23.1% (606,239 vs. 492,554). Data compression, a common server workload, favors the 9455P by 23.5% (1,928,897 vs. 1,562,251).

The one near-tie is data encryption, where the 9455P manages only a 0.6% edge (115,403 vs. 114,769). This is the single benchmark where the two processors are effectively equal, and it is worth noting for any workload that is encryption-bound. Elsewhere, the 9455P's advantage is substantial. Multithread performance is 53.2% higher (116,927 vs. 76,322), and single-thread performance is 43% higher (3,745 vs. 2,618). The average benchmark score tells the same story: 217,854 for the 9455P against 167,788 for the 7C13, a 29.8% overall gap. The 9455P sits at the 99th percentile among all CPUs, while the 7C13 sits at the 98th.

Architecture Differences

The two processors come from different eras of AMD's server roadmap. The EPYC 9455P is built on Zen 5 architecture, codenamed Turin, and belongs to the EPYC 9005 series. The EPYC 7C13 uses Zen 3, codenamed Milan. The manufacturing process is a major divider: the 9455P is fabricated on a 4 nm node at TSMC, while the 7C13 uses TSMC's 7 nm node. Transistor counts reflect this: 66,520 million for the 9455P versus 33,200 million for the 7C13. Die size also differs, with the 9455P using 8x 70.6 mm² chiplets and the 7C13 using 8x 81 mm² chiplets.

Core counts do not favor the newer chip. The 7C13 has 64 cores and 128 threads, while the 9455P has 48 cores and 96 threads. Despite having fewer cores, the 9455P wins every multicore benchmark, which indicates that Zen 5's per-core performance and clock speeds more than compensate for the 16-core deficit. The base clock of the 9455P is 3.15 GHz, and the boost clock reaches 4.40 GHz. The 7C13 bases at 2.00 GHz and boosts to 3.68 GHz. The 9455P also carries a higher TDP at 300 watts versus 225 watts for the 7C13.

Cache layouts differ per core. The 9455P has 80 KB of L1 per core and 1 MB of L2 per core, while the 7C13 has 64 KB of L1 and 512 KB of L2. Both share a 256 MB L3 cache. Memory support is another clear generational split. The 9455P uses DDR5 with a twelve-channel memory bus and 576.0 GB/s of bandwidth. The 7C13 uses DDR4 with an eight-channel bus and 204.8 GB/s. That is nearly three times the memory bandwidth on the newer part, a factor that matters for data-heavy server workloads.

PCIe support also advances. The 9455P offers Gen 5 with 128 lanes (CPU only), while the 7C13 offers Gen 4 with the same 128 lanes. Sockets are not interchangeable: the 9455P uses AMD Socket SP5, and the 7C13 uses AMD Socket SP3. The 9455P was released in October 2024 and carries a launch MSRP of $4819. The 7C13 has no recorded launch MSRP in the database. Both are active in production and support ECC memory. Neither has integrated graphics, and neither has an unlocked multiplier.

Where Each One Wins

Given the 17-0 sweep, the EPYC 9455P is the clear winner in nearly every category. For general compute, rendering, and heavily multithreaded workloads, the 9455P's 52.9% Cinebench advantage makes it the obvious choice. The PassMark multithread score, 53.2% higher, reinforces this. Single-threaded workloads also favor the 9455P by 43%, so even lightly threaded applications run faster on the newer chip.

Data compression favors the 9455P by 23.5%, making it better suited for storage and database workloads that rely on compression. Random string sorting shows an 84.8% gap, which points to a strong advantage in sorting and text-processing tasks. Floating point and integer math both favor the 9455P, by 34.1% and 23.1% respectively, so scientific computing and numerical simulation will see solid gains. The physics test, with its 253.1% delta, suggests a massive improvement in workloads that stress per-core floating-point throughput and cache efficiency.

The EPYC 7C13 retains one narrow edge: data encryption is essentially a tie, with the 9455P ahead by only 0.6%. If a workload is dominated by encryption, the 7C13 is not at a meaningful disadvantage. The 7C13 also offers more cores, 64 versus 48, which may matter for licensing models that charge per core, though the benchmark data shows the 9455P outperforms it even in multicore tests. For legacy DDR4 memory environments or existing SP3 platforms, the 7C13 avoids a platform upgrade, but that is a compatibility consideration rather than a performance one.

FAQ

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

A: The AMD EPYC 9455P is 43% faster in PassMark single-thread testing, scoring 3,745 versus 2,618 for the 7C13. Cinebench R23 single-core shows the same trend at 14,005 versus 9,158, a 52.9% lead.

Q: Does the EPYC 7C13 win any benchmark?

A: No. The head-to-head data shows the EPYC 9455P winning all 17 recorded benchmarks. The closest result is data encryption, where the 9455P leads by only 0.6%.

Q: How does the core count difference affect results?

A: The 7C13 has 64 cores versus 48 for the 9455P, but the 9455P still wins multicore tests by roughly 53%. Cinebench R23 multicore scores are 99,206 for the 9455P and 64,873 for the 7C13.

Q: What is the memory bandwidth difference?

A: The 9455P supports DDR5 with a twelve-channel bus and 576.0 GB/s of bandwidth. The 7C13 supports DDR4 with an eight-channel bus and 204.8 GB/s.

Q: Are these processors socket-compatible?

A: No. The 9455P uses AMD Socket SP5, while the 7C13 uses AMD Socket SP3. They are not interchangeable in the same platform.

Q: What is the overall average benchmark score gap?

A: The 9455P has an average benchmark score of 217,854, compared to 167,788 for the 7C13, a 29.8% difference. The 9455P ranks in the 99th percentile, and the 7C13 ranks in the 98th.

The Verdict

The data supports a straightforward conclusion: the AMD EPYC 9455P is the superior processor in every measured performance category. The 17-0 head-to-head record, combined with an average score 29.8% higher, leaves no ambiguity. The 9455P is the choice for any workload where performance matters, from rendering and scientific computing to data compression and general server tasks. Its 4 nm Zen 5 architecture, 4.40 GHz boost clock, and 576.0 GB/s of DDR5 bandwidth give it a decisive edge over the older 7C13.

The EPYC 7C13 still has a role in specific situations. Its 64 cores and 128 threads provide more parallel hardware, which can matter in core-count-licensed environments. Its data encryption performance is statistically tied with the 9455P, so encryption-heavy applications lose nothing by staying on the older chip. For systems already on Socket SP3 with DDR4 memory, the 7C13 allows a drop-in upgrade without a platform change. But for new deployments, the 9455P is the clear recommendation based on the recorded benchmarks.

The 9455P's 253.1% lead in physics and 105.4% lead in prime-number finding are the standout results, showing that Zen 5 delivers more than just clock speed improvements. The 52.9% uniform lead across all Cinebench tests indicates a broad architectural uplift, not a workload-specific fluke. The 7C13 is a capable processor in its own right, ranking in the 98th percentile, but it is outclassed by the newer part across the board.

Specification Differences

| Specification | AMD EPYC 9455P | AMD EPYC 7C13 |

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

| Cores | 48 | 64 |

| Threads | 96 | 128 |

| Base Clock | 3.15 GHz | 2.00 GHz |

| Boost Clock | 4.40 GHz | 3.68 GHz |

| TDP | 300 W | 225 W |

| Socket | AMD Socket SP5 | AMD Socket SP3 |

| Architecture | Zen 5 | Zen 3 |

| Codename | Turin | Milan |

| Process Node | 4 nm | 7 nm |

| Transistors | 66,520 million | 33,200 million |

| Die Size | 8x 70.6 mm² | 8x 81 mm² |

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

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

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

| Memory Support | DDR5 | DDR4 |

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

| Memory Bandwidth | 576.0 GB/s | 204.8 GB/s |

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

| Release Date | 2024-10-09 | Not recorded |

| Launch MSRP | $4819 | Not recorded |