AMD EPYC 9634 vs AMD Ryzen Threadripper PRO 9985WX Comparison

Head-to-Head Benchmarks

The benchmark comparison between the AMD Ryzen Threadripper PRO 9985WX and the AMD EPYC 9634 is strikingly one-sided. Out of 17 recorded head-to-head tests, the Threadripper PRO wins 16, with the EPYC claiming a single victory. The most dramatic margins appear in the Cinebench suite, where the Threadripper PRO leads by a consistent 44.8% across all six tests, from Cinebench R15 single-core (1890 versus 1305) to Cinebench R23 multi-core (132859 versus 91752). This uniformity suggests a fundamental architectural advantage rather than a workload-specific edge.

The Passmark results tell a similar story but with varying intensity. The largest gap appears in extended instructions, where the Threadripper PRO scores 225340 against 137543, a 63.8% advantage. Floating point math follows closely at 56.4% (553348 versus 353784), and single-thread performance shows a 53.3% lead (4482 versus 2924). These are not marginal differences; they represent a substantial generational leap in per-core capability.

Data compression favors the Threadripper PRO by 30.3% (2912972 versus 2236412), while integer math shows a 20.3% gap (872710 versus 725356). Multithread performance, often the domain where higher core counts should shine, still favors the Threadripper PRO by 39% (150071 versus 107944), despite the EPYC having 84 cores against 64. Random string sorting and physics tests show more moderate leads of 26% and 12.1% respectively.

The EPYC 9634's lone win comes in the Passmark find prime numbers test, scoring 1176 against 1138, a 3.2% margin. This is a narrow victory and suggests that the EPYC's higher core count does provide some benefit in specific integer-heavy workloads, but it is an isolated data point. Data encryption is nearly a tie, with the Threadripper PRO ahead by just 1.9% (154824 versus 151943), indicating that both processors handle cryptographic workloads with comparable efficiency.

What the data implies is that the Threadripper PRO 9985WX is not merely faster; it is decisively faster across nearly every measured category. The average benchmark score of 320749 for the Threadripper PRO versus 244274 for the EPYC 9634 puts the gap at roughly 31%, which aligns with the mid-range deltas seen in individual tests.

Architecture Differences

The architectural divide between these two processors is substantial. The Threadripper PRO 9985WX uses Zen 5 architecture on a 4 nm TSMC process, while the EPYC 9634 relies on Zen 4 on a 5 nm node. This process shrink is one explanation for the Threadripper's superior single-thread performance, as the data shows a 44.8% lead in Cinebench R15 single-core and a 53.3% lead in Passmark single-thread tests.

Core counts tell an interesting story. The EPYC 9634 has 84 cores and 168 threads, while the Threadripper PRO has 64 cores and 128 threads. Despite having 20 fewer cores, the Threadripper PRO wins the multi-core Cinebench R23 test by 44.8%. This suggests that Zen 5's per-core throughput is so much higher that it overcomes the EPYC's raw core advantage. The transistor counts reflect this trade-off: the EPYC packs 78,840 million transistors across 12 chiplets of 72 mm² each, while the Threadripper PRO uses 66,520 million transistors across 8 chiplets of 70.6 mm² each.

Cache configurations differ significantly. The EPYC 9634 boasts 384 MB of shared L3 cache, whereas the Threadripper PRO has 256 MB. Both allocate 64 KB of L1 and 1 MB of L2 per core. The larger L3 on the EPYC is likely designed for server workloads with massive working sets, but the benchmark data does not show this translating into wins outside of the single prime number test.

Memory architecture is another differentiator. The EPYC 9634 supports twelve-channel DDR5 memory with a bandwidth of 460.8 GB/s, while the Threadripper PRO has eight-channel DDR5 at 409.6 GB/s. The EPYC's higher memory bandwidth is a 12.5% advantage on paper, yet the Passmark data compression test, which is memory-sensitive, still favors the Threadripper PRO by 30.3%. Clock speeds also diverge sharply: the Threadripper PRO has a base clock of 3.20 GHz and a boost of 5.40 GHz, versus 2.25 GHz base and 3.70 GHz boost on the EPYC. This 1.70 GHz boost advantage is the most tangible explanation for the single-thread dominance.

Both processors use the same PCIe Gen 5 with 128 lanes, support DDR5 memory with ECC, and are built by TSMC. The Threadripper PRO uses socket sTR5 and has an unlocked multiplier, while the EPYC 9634 uses socket SP5 with a locked multiplier. Release timing also differs: the EPYC launched in November 2022, while the Threadripper PRO arrived in July 2025.

FAQ

Q: Which processor has more cores?

A: The AMD EPYC 9634 has 84 cores and 168 threads, while the AMD Ryzen Threadripper PRO 9985WX has 64 cores and 128 threads.

Q: Does the higher core count lead to better multi-core performance?

A: No. Despite having 20 fewer cores, the Threadripper PRO 9985WX wins the multi-core Cinebench R23 test by 44.8% (132859 versus 91752) and the Passmark multithread test by 39% (150071 versus 107944).

Q: What is the single-thread performance difference?

A: The Threadripper PRO leads by 44.8% in Cinebench R15 single-core (1890 versus 1305) and by 53.3% in Passmark single-thread (4482 versus 2924).

Q: Which processor has more L3 cache?

A: The EPYC 9634 has 384 MB of shared L3 cache, while the Threadripper PRO 9985WX has 256 MB.

Q: What is the memory bandwidth difference?

A: The EPYC 9634 supports twelve-channel DDR5 with 460.8 GB/s bandwidth, while the Threadripper PRO has eight-channel DDR5 at 409.6 GB/s.

Q: In which test does the EPYC 9634 win?

A: The EPYC 9634 wins the Passmark find prime numbers test, scoring 1176 against 1138, a 3.2% margin.

The Verdict

The data points to a clear winner for most use cases. The AMD Ryzen Threadripper PRO 9985WX is faster in 16 of 17 benchmark tests, with leads ranging from 1.9% in data encryption to 63.8% in extended instructions. Its average benchmark score of 320749 places it in the 99th percentile of all CPUs, matching the EPYC 9634's percentile but with a significantly higher absolute score.

The Threadripper PRO's nearest rivals in the database include the AMD Ryzen Threadripper 9980X (0.3% behind) and the Intel Xeon 6781P (1.7% behind), indicating that it sits at the top of its performance tier. The EPYC 9634, by contrast, is 8.5% behind the AMD EPYC 9684X and 2.9% behind the Intel Xeon 6980P, showing that it is not even the fastest in its own category.

For users prioritizing raw compute throughput, rendering, or single-thread responsiveness, the Threadripper PRO 9985WX is the obvious choice based on the recorded data. The EPYC 9634's higher core count and larger L3 cache do not translate into benchmark wins, with the sole exception of prime number finding. The EPYC's twelve-channel memory architecture provides higher theoretical bandwidth, but this does not manifest as measurable performance gains in the tests recorded.

The verdict is straightforward: the Threadripper PRO 9985WX dominates in almost every measurable category, and the EPYC 9634's advantages are confined to specifications that do not produce winning benchmark scores.

Specification Differences

| Specification | AMD Ryzen Threadripper PRO 9985WX | AMD EPYC 9634 |

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

| Cores | 64 | 84 |

| Threads | 128 | 168 |

| Base Clock | 3.20 GHz | 2.25 GHz |

| Boost Clock | 5.40 GHz | 3.70 GHz |

| TDP | 350 W | 290 W |

| Socket | AMD Socket sTR5 | AMD Socket SP5 |

| Architecture | Zen 5 | Zen 4 |

| Codename | Shimada Peak | Genoa |

| Process Node | 4 nm | 5 nm |

| Transistors | 66,520 million | 78,840 million |

| Die Size | 8x 70.6 mm² | 12x 72 mm² |

| L3 Cache | 256 MB | 384 MB (shared) |

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

| Memory Bandwidth | 409.6 GB/s | 460.8 GB/s |

| Launch MSRP | $7999 | $10304 |

| Multiplier Unlocked | Yes | No |

| Release Date | 2025-07-22 | 2022-11-09 |

Where Each One Wins

The AMD Ryzen Threadripper PRO 9985WX wins in nearly every scenario measured. For content creation workloads like 3D rendering, the Cinebench R23 multi-core score of 132859 against 91752 indicates a 44.8% advantage that would translate to proportionally faster render times. For scientific computing, the floating point math score of 553348 versus 353784 (56.4% lead) suggests substantial gains in simulations and numerical analysis. Data compression tasks, often bottlenecked by memory throughput, still favor the Threadripper PRO by 30.3%, making it the better choice for archiving, database operations, or any workload that shuffles large volumes of data.

Single-thread performance is where the Threadripper PRO is most dominant, with a 53.3% lead in Passmark single-thread tests. This affects everything from spreadsheet calculations to legacy software that cannot utilize multiple cores. The unlocked multiplier on the Threadripper PRO also offers headroom for manual tuning, though the recorded data does not include overclocked results.

The AMD EPYC 9634 wins in exactly one scenario: prime number finding, where it scores 1176 against 1138. This is a narrow 3.2% margin and represents a highly specific workload involving integer factorization or primality testing. The EPYC's higher core count (84 versus 64) and larger L3 cache (384 MB versus 256 MB) may contribute to this result, but the data does not show any other test where these specifications provide a measurable benefit.

For memory-bandwidth-bound applications, the EPYC's 460.8 GB/s twelve-channel architecture is theoretically superior to the Threadripper's 409.6 GB/s eight-channel design, yet the Passmark data compression test, which stresses memory, shows the Threadripper PRO winning by 30.3%. This suggests that raw bandwidth figures do not predict real-world performance in the recorded benchmarks.

The practical takeaway from the data is that the Threadripper PRO 9985WX is the superior processor for the vast majority of workloads, while the EPYC 9634 holds a single niche advantage. Users building systems for general high-performance computing, rendering, or development should favor the Threadripper PRO. Those running very specific prime-number-intensive applications might consider the EPYC, but the 3.2% margin is unlikely to justify the trade-offs elsewhere.