AMD EPYC 8434P vs AMD Ryzen Threadripper PRO 9975WX Comparison

Head-to-Head Benchmarks

The benchmark data presents a decisive picture. The AMD Ryzen Threadripper PRO 9975WX wins 16 of the 17 recorded head-to-head tests, with the AMD EPYC 8434P claiming a single victory. The magnitude of the Threadripper's wins varies dramatically by workload, ranging from a modest 16.4% edge to a 108.1% blowout.

The most extreme result appears in the PassMark find prime numbers test. The Threadripper PRO 9975WX scores 620 against the EPYC's 298, a 108.1% advantage. This workload is highly sensitive to single-thread performance and cache behavior, and the data shows the Threadripper dominating in that domain.

Across the Cinebench suite, the results are remarkably consistent. In Cinebench R15 multi-core, the Threadripper scores 9430 versus 5696, a 65.6% lead. Single-core in R15 shows a 65.5% gap (1331 versus 804). Moving to R20, the multi-core delta is 65.5% (39292 versus 23736), and single-core is 65.6% (5546 versus 3350). The R23 results echo the pattern: multi-core at 93553 versus 56516 is a 65.5% difference, while single-core at 13207 versus 7978 is also 65.5%. The consistency across all three Cinebench generations indicates a stable architectural performance gap rather than workload-specific quirks.

The PassMark suite reveals a more nuanced picture. In floating point math, the Threadripper leads by 41.3% (304833 versus 215669). Integer math shows a smaller 19.8% gap (461724 versus 385290). Data compression favors the Threadripper by 16.4% (1644573 versus 1412835), the narrowest multi-threaded margin in the data. Physics testing shows an 80.6% advantage for the Threadripper (7288 versus 4036). Random string sorting is 49.3% faster on the Threadripper (188014 versus 125932). Extended instructions produce a 59.8% gap (137733 versus 86189). The multithread test shows a 57.8% lead (104902 versus 66490).

The single-thread tests in PassMark mirror the Cinebench single-core results. The Threadripper scores 4408 against the EPYC's 2448, an 80.1% advantage. This is the single largest percentage gap outside the prime number test, underscoring the fundamental difference in per-core capability.

The EPYC 8434P's only win comes in data encryption, where it scores 97254 against the Threadripper's 85035, a 12.6% advantage. This is notable because it suggests the EPYC's higher core count (48 versus 32) and its specific instruction set implementation provide a genuine advantage in this particular cryptographic workload. The delta is meaningful but isolated; no other test in the database shows a similar EPYC advantage.

Looking at broader database context, the Threadripper PRO 9975WX has an average benchmark score of 182700, placing it in the 98th percentile of all CPUs. Its nearest rivals include the AMD EPYC 8534P (185092, 1.3% higher), the Intel Xeon 6740E (187718, 2.7% higher), and the Intel Xeon 6740P (176227, 3.7% lower). The EPYC 8434P, by contrast, averages 146881, also in the 98th percentile, with its nearest rival being the AMD Ryzen Threadripper PRO 9965WX at 147009, a mere 0.1% difference. This places the two processors in different performance tiers within the same percentile ranking.

Architecture Differences

The two processors represent distinct design philosophies within AMD's lineup. The Ryzen Threadripper PRO 9975WX is built on the Zen 5 architecture, codenamed Shimada Peak, fabricated on a 4 nm process at TSMC. It belongs to the Ryzen Threadripper 9000 series. The EPYC 8434P uses the Zen 4c architecture, codenamed Siena, on a 5 nm process, also from TSMC, and belongs to the EPYC 8004 series.

The core counts differ substantially. The Threadripper has 32 cores and 64 threads. The EPYC has 48 cores and 96 threads. Despite having 50% more cores, the EPYC produces significantly lower multi-threaded scores in nearly every test, which directly reflects the per-core performance differential.

Clock speeds tell a clear story. The Threadripper has a base clock of 4.00 GHz and a boost clock of 5.40 GHz. The EPYC operates at 2.50 GHz base and 3.10 GHz boost. The Threadripper's boost clock is 74% higher, which explains the massive single-thread performance gaps observed across all Cinebench and PassMark single-core tests.

Cache configuration is similar in total L3 capacity but differs in organization. Both processors have 128 MB of L3 cache, with the Threadripper listing it as 128 MB (unspecified organization) and the EPYC as 128 MB (shared). Both have 64 KB L1 per core and 1 MB L2 per core. The Threadripper's die is comprised of 4x 70.6 mm² chiplets, while the EPYC uses 4x 73 mm² chiplets. Transistor counts are close: 33,260 million for the Threadripper and 35,500 million for the EPYC.

Memory architecture diverges significantly. The Threadripper supports eight-channel DDR5 memory with a bandwidth of 409.6 GB/s. The EPYC supports six-channel DDR5 with 230.4 GB/s bandwidth. The Threadripper has 78% more memory bandwidth, which likely contributes to its advantages in data compression and integer math workloads.

PCIe connectivity also differs. The Threadripper provides Gen 5 with 128 lanes (CPU only), while the EPYC provides Gen 5 with 96 lanes (CPU only). Both support ECC memory. The Threadripper has an unlocked multiplier; the EPYC does not.

The Threadripper uses AMD Socket sTR5, while the EPYC uses AMD Socket SP6. The Threadripper's TDP is 350 W, the EPYC's is 200 W. Release dates differ: the Threadripper launched on 2025-07-22, the EPYC on 2023-09-17. The Threadripper carries the part number 100-000000723; the EPYC is 100-000000877. Neither has integrated graphics.

FAQ

Q: Which processor has better single-thread performance?

A: The AMD Ryzen Threadripper PRO 9975WX is decisively ahead. In Cinebench R23 single-core, it scores 13207 versus 7978, a 65.5% advantage. PassMark single-thread shows an 80.1% lead (4408 versus 2448). The Threadripper's 5.40 GHz boost clock versus the EPYC's 3.10 GHz boost clock is the primary driver.

Q: Does the EPYC 8434P win any benchmark tests?

A: Yes, exactly one. The EPYC wins the PassMark data encryption test with a score of 97254 against the Threadripper's 85035, a 12.6% advantage. This is the sole EPYC victory across all 17 head-to-head tests.

Q: How do their multi-core Cinebench scores compare?

A: The Threadripper leads by 65.5% in all three Cinebench versions. In R15, it scores 9430 versus 5696. In R20, 39292 versus 23736. In R23, 93553 versus 56516. The consistency suggests a fixed architectural performance ratio.

Q: What is the difference in core count and clock speed?

A: The EPYC has 48 cores and 96 threads versus the Threadripper's 32 cores and 64 threads. However, the Threadripper has a base clock of 4.00 GHz and boost of 5.40 GHz, against the EPYC's 2.50 GHz base and 3.10 GHz boost.

Q: How do their average benchmark scores compare to nearby rivals?

A: The Threadripper averages 182700, with its closest rival being the AMD EPYC 8534P at 185092 (1.3% higher). The EPYC 8434P averages 146881, with the AMD Ryzen Threadripper PRO 9965WX at 147009 (0.1% higher) as its closest competitor.

Q: What memory bandwidth does each support?

A: The Threadripper supports eight-channel DDR5 at 409.6 GB/s. The EPYC supports six-channel DDR5 at 230.4 GB/s. This 78% bandwidth advantage for the Threadripper likely contributes to its wins in data-intensive workloads.

Specification Differences

| Field | AMD Ryzen Threadripper PRO 9975WX | AMD EPYC 8434P |

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

| Cores | 32 | 48 |

| Threads | 64 | 96 |

| Base Clock | 4.00 GHz | 2.50 GHz |

| Boost Clock | 5.40 GHz | 3.10 GHz |

| TDP | 350 W | 200 W |

| Socket | AMD Socket sTR5 | AMD Socket SP6 |

| Architecture | Zen 5 | Zen 4c |

| Codename | Shimada Peak | Siena |

| Process Node | 4 nm | 5 nm |

| Transistors | 33,260 million | 35,500 million |

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

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

| Memory Bus | Eight-channel | Six-channel |

| Memory Bandwidth | 409.6 GB/s | 230.4 GB/s |

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

| Multiplier Unlocked | Yes | No |

| Release Date | 2025-07-22 | 2023-09-17 |

| Part Number | 100-000000723 | 100-000000877 |

| Launch MSRP | $4099 | $2700 |

The specification table highlights the fundamental trade-off. The EPYC offers 50% more cores and 50% more threads, but at dramatically lower clocks and with less memory bandwidth. The Threadripper counters with a newer architecture (Zen 5 versus Zen 4c), a smaller process node (4 nm versus 5 nm), and substantially higher operating frequencies. The 128 MB L3 cache is identical in capacity, though the Threadripper's is not listed as shared.

The Verdict

The recorded data points to a clear hierarchy. The AMD Ryzen Threadripper PRO 9975WX is the stronger processor in almost every measurable workload. Its 16-to-1 win record in head-to-head tests, combined with an average benchmark score of 182700 against the EPYC's 146881, establishes a performance advantage of approximately 24% overall.

The Threadripper is the choice for workloads that prioritize per-core performance, memory bandwidth, and responsiveness. Its 65.5% lead across all Cinebench multi-core tests, 80.1% lead in PassMark single-thread, and 78% higher memory bandwidth make it the superior option for rendering, simulation, and general compute tasks where the database records show consistent dominance. The 4 nm Zen 5 architecture and 5.40 GHz boost clock provide the foundation for these results.

The EPYC 8434P has a narrower appeal. Its single win in data encryption (12.6% ahead) indicates an advantage in specific cryptographic workloads. Its 48 cores and 96 threads provide higher raw thread counts, which could benefit workloads that scale primarily by core count rather than per-core speed, though the benchmark data does not show such an advantage in any recorded test. Its 200 W TDP is 150 W lower than the Threadripper's, which may matter for dense server deployments, though the data does not include power efficiency measurements.

For buyers whose workloads match the benchmark suite, the Threadripper PRO 9975WX is the data-supported choice. Its average score of 182700 sits within 1.3% of the AMD EPYC 8534P and 2.7% of the Intel Xeon 6740E, placing it at the top tier of the database's 98th percentile. The EPYC 8434P, while also in the 98th percentile, holds a lower position within that tier, with its closest rival being the Threadripper PRO 9965WX at a 0.1% difference. The 9975WX's 24.4% average score advantage over the 8434P, derived from the recorded averages, is the single most informative statistic for this comparison.