AMD EPYC 8434P vs AMD EPYC 9275F Comparison

The AMD EPYC 8434P and AMD EPYC 9275F target different server workloads, and the benchmark data reflects that split clearly. The 8434P, a 48-core Zen 4c part built for high-density cloud and scale-out tasks, faces the 9275F, a 24-core Zen 5 processor aimed at frequency-sensitive and database-heavy roles. Across 17 head-to-head tests, the 9275F wins 13 while the 8434P takes 4, but the margins tell a more nuanced story than the raw win count suggests.

Head-to-Head Benchmarks

The 9275F dominates every Cinebench iteration by the same margin: a 21.4% advantage in both single-core and multi-core runs. In Cinebench R23, the 9275F scores 71927 multi-core against the 8434P’s 56516, while single-core sees 10154 versus 7978. This uniformity across R15, R20, and R23 indicates a consistent architectural edge rather than workload-specific behavior—the Zen 5 cores in the 9275F simply execute more instructions per clock, and the higher 4.80 GHz boost clock versus 3.10 GHz amplifies that lead.

The PassMark suite reveals where the 8434P fights back. Its 48 cores and 96 threads turn data compression into a landslide: 1412835 versus 1212560, a 16.5% win. Encryption is even more lopsided—the 8434P scores 97254 against 62664, a 55.2% margin that suggests the larger core count handles cryptographic parallelism far better. Integer math also favors the 8434P at 385290 versus 317777 (21.2% ahead), and floating-point math edges out 215669 to 201888 (6.8% ahead). These are throughput-bound tests where the 8434P’s 48 physical cores overwhelm the 9275F’s 24, even with the latter’s superior per-core speed.

The 9275F answers with decisive wins in latency-sensitive and single-threaded workloads. PassMark single-thread scores 3810 versus 2448—a 35.7% gap that reflects the boost clock delta and Zen 5’s IPC advantage. Find prime numbers shows the starkest contrast: 991 versus 298, a 69.9% margin that points to integer-heavy, low-parallelism loops where the 9275F’s raw clock speed dominates. Physics simulation also favors the 9275F at 12089 versus 4036 (66.6% ahead), and random string sorting goes 144037 to 125932 (12.6% ahead). Extended instructions favor the 9275F at 94889 versus 86189 (9.2% ahead), and PassMark multithread—which balances parallel and sequential components—lands at 84620 for the 9275F against 66490 for the 8434P, a 21.4% win that mirrors the Cinebench results.

The average benchmark scores reinforce the split: the 8434P sits at 146881 versus 133174 for the 9275F, a 10.3% gap in the 8434P’s favor. This is driven by the 8434P’s massive wins in compression and encryption, which carry heavy weight in the aggregate. However, the 9275F holds a higher percentile ranking at 98 versus 99 for the 8434P—both are elite parts, but the 8434P edges into the top 1% of all CPUs tested.

FAQ

Q: Which processor wins more head-to-head benchmarks?

A: The AMD EPYC 9275F wins 13 of 17 tests, while the AMD EPYC 8434P wins 4. The 9275F takes all six Cinebench runs plus seven PassMark tests; the 8434P wins data compression, data encryption, floating-point math, and integer math.

Q: How large is the single-core performance gap?

A: The 9275F leads by 35.7% in PassMark single-thread (3810 versus 2448) and by 21.4% in every Cinebench single-core test. For example, Cinebench R23 single-core scores 10154 for the 9275F versus 7978 for the 8434P.

Q: Where does the 8434P have its biggest advantage?

A: Data encryption shows the largest margin: the 8434P scores 97254 versus 62664, a 55.2% lead. Data compression follows at 16.5% (1412835 versus 1212560), and integer math at 21.2% (385290 versus 317777).

Q: Does the 9275F win any parallel workloads?

A: Yes—Cinebench multi-core tests all go to the 9275F by 21.4%. PassMark multithread also favors it at 84620 versus 66490, and physics simulation shows a 66.6% gap (12089 versus 4036), despite the 8434P having twice the cores.

Q: How do the average benchmark scores compare?

A: The 8434P has a higher average benchmark score of 146881, which is 10.3% above the 9275F’s 133174. This aggregate favors the 8434P because its wins in compression and encryption are large enough to offset the 9275F’s narrower but numerous victories.

Q: What is the percentile ranking for each CPU?

A: The 8434P ranks in the 99th percentile of all CPUs, while the 9275F ranks in the 98th. Both are near the top, but the 8434P’s aggregate performance places it slightly higher overall.

Architecture Differences

The two processors come from different design philosophies. The 8434P uses Zen 4c architecture on TSMC’s 5 nm process, with 35,500 million transistors spread across 4x 73 mm² dies. The 9275F uses Zen 5 on a 4 nm node, packing 66,520 million transistors into 8x 70.6 mm² dies. The 8434P’s core count reaches 48 with 96 threads, while the 9275F halves that to 24 cores and 48 threads. Clock speeds invert the core count: the 8434P runs at 2.50 GHz base and 3.10 GHz boost, whereas the 9275F starts at 4.10 GHz and boosts to 4.80 GHz.

Cache hierarchies differ in size and distribution. The 8434P allocates 64 KB L1 per core and 1 MB L2 per core, with 128 MB of shared L3. The 9275F gives each core 80 KB L1 and 1 MB L2, but its shared L3 doubles to 256 MB. This larger L3 likely contributes to the 9275F’s strong showing in random string sorting and extended instructions, where data reuse within a smaller core count benefits from a bigger cache pool.

Memory systems diverge sharply. The 8434P supports six-channel DDR5 with a bandwidth of 230.4 GB/s, while the 9275F uses twelve-channel DDR5 at 576.0 GB/s—exactly double the channels and bandwidth. Both support ECC memory, but the 9275F’s wider memory bus gives it a clear advantage for memory-bound server tasks like database queries or virtualization workloads. PCIe connectivity also differs: the 8434P offers Gen 5 with 96 lanes (CPU only), while the 9275F provides Gen 5 with 128 lanes (CPU only), giving the latter more headroom for expansion cards and NVMe storage.

Sockets and platforms are incompatible. The 8434P uses AMD Socket SP6, while the 9275F uses AMD Socket SP5, meaning they require different motherboards and system designs. The 8434P launches with a 200 W TDP, whereas the 9275F draws 320 W—a 120 W difference that affects cooling and power delivery requirements. Neither chip has a multiplier unlocked, so overclocking is not supported on either part. The 8434P’s release date precedes the 9275F’s, and both remain in active production.

The Verdict

The data points to a clear workload split. Choose the AMD EPYC 8434P when thread count and parallel throughput are paramount—its 48 cores deliver a 55.2% lead in data encryption and a 21.2% lead in integer math over the 9275F. The 8434P’s 10.3% higher average benchmark score (146881 versus 133174) and 99th percentile ranking make it the stronger aggregate performer, particularly for scale-out environments like cloud containers, data compression pipelines, and encryption-heavy services where the extra cores translate directly into higher throughput.

Choose the AMD EPYC 9275F when single-thread speed and low-latency response matter more than raw core count. It wins every Cinebench test by 21.4%, takes PassMark single-thread by 35.7%, and crushes prime-number finding by 69.9%. Its 256 MB L3 cache and 576.0 GB/s memory bandwidth make it a better fit for database engines, real-time analytics, and high-frequency trading where per-query latency dominates. The 9275F’s 320 W TDP and twelve-channel memory support reflect a design that prioritizes peak performance over density, while the 8434P’s 200 W TDP and six-channel bus align with power-conscious, scale-out deployments.

The 9275F also wins PassMark multithread (84620 versus 66490) despite having half the cores, indicating that its per-core efficiency overcomes the 8434P’s numerical advantage in mixed workloads. However, the 8434P’s wins in compression and encryption are so decisive that any workload dominated by those tasks will strongly favor it. The 13-4 win count for the 9275F masks the magnitude of the 8434P’s victories—a 55.2% encryption margin is harder to overcome than a 21.4% Cinebench gap. Ultimately, the choice hinges on whether the software stack scales across 48 cores or whether it depends on the fastest possible single-thread execution.

Specification Differences

| Specification | AMD EPYC 8434P | AMD EPYC 9275F |

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

| Cores | 48 | 24 |

| Threads | 96 | 48 |

| Base Clock | 2.50 GHz | 4.10 GHz |

| Boost Clock | 3.10 GHz | 4.80 GHz |

| TDP | 200 W | 320 W |

| Socket | AMD Socket SP6 | AMD Socket SP5 |

| Architecture | Zen 4c | Zen 5 |

| Codename | Siena | Turin |

| Process Node | 5 nm | 4 nm |

| Transistors | 35,500 million | 66,520 million |

| Die Size | 4x 73 mm² | 8x 70.6 mm² |

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

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

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

| Memory Bus | Six-channel | Twelve-channel |

| Memory Bandwidth | 230.4 GB/s | 576.0 GB/s |

| PCIe | Gen 5, 96 Lanes (CPU only) | Gen 5, 128 Lanes (CPU only) |

| Launch MSRP | $2700 | $3439 |