AMD EPYC 7C13 vs AMD EPYC 9355P Comparison

The AMD EPYC 9355P and AMD EPYC 7C13 are both high-end server processors from AMD, but they represent different architectural eras. The 9355P is a Zen 5 (Turin) part with 32 cores and 64 threads, while the 7C13 is a Zen 3 (Milan) part with 64 cores and 128 threads. Head-to-head benchmark data shows the 9355P wins 13 of 17 tests, yet the 7C13 holds a higher average benchmark score (167788 vs 160853). This analysis breaks down the numbers to show where each processor excels.

FAQ

Q: Which processor has more cores?

A: The 7C13 has 64 cores and 128 threads, exactly double the 9355P's 32 cores and 64 threads.

Q: Which CPU has higher single-thread performance?

A: The 9355P scores 3741 in Passmark single-thread versus 2618 for the 7C13, a 42.9% lead.

Q: What is the memory bandwidth difference?

A: The 9355P supports DDR5 with twelve-channel memory and 576.0 GB/s bandwidth, while the 7C13 uses DDR4 with eight channels and 204.8 GB/s.

Q: Which CPU is better for encryption workloads?

A: The 7C13 wins in Passmark data encryption with 114769 versus 81945, a 28.6% advantage.

Q: Do both CPUs have the same L3 cache?

A: Yes, both have 256 MB of shared L3 cache.

Q: What are the process nodes?

A: The 9355P is built on TSMC's 4 nm process, while the 7C13 uses TSMC's 7 nm process.

Architecture Differences

The two processors diverge at the architectural level. The 9355P uses the Zen 5 architecture on a 4 nm TSMC node, with 66,520 million transistors spread across 8 chiplets of 70.6 mm² each. The 7C13 uses the older Zen 3 architecture on a 7 nm node, with 33,200 million transistors across 8 chiplets of 81 mm² each. The newer process allows the 9355P to pack more transistors into a smaller die area, but the 7C13 compensates with twice the core count.

Per-core cache differs significantly. The 9355P has 80 KB of L1 and 1 MB of L2 per core, while the 7C13 has 64 KB of L1 and 512 KB of L2 per core. Both share 256 MB of L3 cache, but the 9355P's larger per-core caches help explain its strong single-thread results. The 9355P also runs at a higher base clock (3.55 GHz vs 2000.00 MHz) and boost clock (4.40 GHz vs 3.68 GHz), though it consumes more power (280 W TDP vs 225 W TDP).

Memory and I/O differ as well. The 9355P uses DDR5 with a twelve-channel memory bus and 576.0 GB/s bandwidth, while the 7C13 uses DDR4 with eight channels and 204.8 GB/s. The 9355P also moves to PCIe Gen 5 with 128 lanes (CPU only), whereas the 7C13 stays on PCIe Gen 4 with the same 128 lanes. Socket compatibility is also different: the 9355P uses AMD Socket SP5, and the 7C13 uses AMD Socket SP3.

Head-to-Head Benchmarks

The 9355P dominates the Cinebench suite. Across all six Cinebench R15, R20, and R23 tests (single and multi-core), it records a consistent 27.4% advantage. For example, in Cinebench R23 multi-core, the 9355P scores 82666 against 64873 for the 7C13; in single-core, it scores 11670 versus 9158. This uniformity suggests a fundamental per-thread performance gap that scales across all core counts.

Passmark results show a more mixed picture. The 9355P wins Passmark multithread (97255 vs 76322, 27.4% delta), physics (14521 vs 4904, 196.1% delta), find prime numbers (1041 vs 539, 93.1% delta), random string sorting (180482 vs 131361, 37.4% delta), and single-thread (3741 vs 2618, 42.9% delta). It also takes extended instructions (106821 vs 85034, 25.6% delta). The 7C13 counters in data compression (1562251 vs 1431968, -8.3% delta), data encryption (114769 vs 81945, -28.6% delta), floating point math (266846 vs 255177, -4.4% delta), and integer math (492554 vs 414347, -15.9% delta).

Overall, the 9355P wins 13 of the 17 head-to-head tests. Its biggest margin is in physics (196.1%) and prime number finding (93.1%), while the 7C13's largest win is in encryption (28.6%). The average benchmark score still favors the 7C13 (167788 vs 160853), a 4.3% difference from the 7C13's perspective, but the 9355P's win count is decisive.

Specification Differences

| Specification | AMD EPYC 9355P | AMD EPYC 7C13 |

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

| Cores | 32 | 64 |

| Threads | 64 | 128 |

| Base Clock | 3.55 GHz | 2000.00 MHz |

| Boost Clock | 4.40 GHz | 3.68 GHz |

| TDP | 280 W | 225 W |

| Socket | AMD Socket SP5 | AMD Socket SP3 |

| Architecture | Zen 5 | Zen 3 |

| Process Node | 4 nm | 7 nm |

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

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

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

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

| 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 | October 9 | Not listed |

| Launch MSRP | $2998 | Not listed |

| Part Number | 100-000001521 | 100-000000315 |

Both CPUs have 256 MB shared L3 cache, support ECC memory, and are unlocked for multiplier changes (false). Both are in the 99th percentile of all CPUs, according to the benchmark database.

The Verdict

The data shows that the 9355P is the stronger performer in most benchmarks, winning 13 of 17 tests. Its consistent 27.4% lead across Cinebench and a 42.9% single-thread advantage indicate a clear per-core performance superiority. The 9355P also offers significantly higher memory bandwidth (576.0 GB/s vs 204.8 GB/s) and a newer PCIe generation, which can benefit memory-bound and I/O-heavy workloads.

However, the 7C13 is not without merit. It wins in data compression, encryption, floating point math, and integer math—areas where its higher core count (64 vs 32) and larger total threads likely play a role. The 7C13 also holds a higher average benchmark score (167788 vs 160853), a 4.3% difference, and it does so at a lower TDP (225 W vs 280 W). For workloads that scale well with core count and are not sensitive to single-thread speed, the 7C13 may be the better choice. For general-purpose server tasks, rendering, physics, and single-thread-heavy applications, the 9355P is the clear winner.

Where Each One Wins

The 9355P wins in Cinebench R15, R20, and R23 (both single and multi-core), Passmark multithread, physics, find prime numbers, random string sorting, single-thread, and extended instructions. These results point to strengths in rendering, scientific simulation, prime number computation, and any workload that benefits from high per-core throughput and fast memory.

The 7C13 wins in Passmark data compression, data encryption, floating point math, and integer math. These are typically throughput-oriented tasks where the extra 32 cores and 128 threads provide an advantage. For encryption-heavy environments, database compression, or numerical computation that uses integer or floating point operations at scale, the 7C13 holds a measurable edge. Its lower TDP also makes it a more power-efficient option for sustained all-core loads.