AMD Ryzen 9 PRO 9955 vs AMD Ryzen Threadripper PRO 9955WX Comparison

Head-to-Head Benchmarks

The AMD Ryzen 9 PRO 9955 and AMD Ryzen Threadripper PRO 9955WX share the same Zen 5 generation family, but their benchmark profiles diverge sharply. The Threadripper PRO 9955WX wins 8 of 11 head-to-head tests, while the Ryzen 9 PRO 9955 takes 3. The margin of victory, however, tells a more nuanced story than the raw win count.

The Threadripper PRO 9955WX dominates in throughput-oriented workloads. Its largest advantage comes in PassMark data compression, scoring 920,954 against the Ryzen 9 PRO 9955's 684,470 — a 25.7% delta. Extended instructions follow a similar pattern: 76,363 versus 54,903, a 28.1% gap. Random string sorting shows a 27.9% advantage (99,813 vs. 71,928), while data encryption lands at 44,389 versus 33,754, a 24% lead. These are substantial, consistent margins across memory-latency-sensitive and instruction-heavy tasks.

Integer math and floating-point math also favor the Threadripper, though by slightly smaller margins. Integer math scores 236,120 against 182,312 (22.8% ahead), and floating-point math reaches 156,215 versus 121,509 (22.2% ahead). The multi-threaded PassMark score shows a narrower 18.2% gap (67,035 vs. 54,866), and physics simulation trails at 19.8% (4,156 vs. 3,332). These results align with the Threadripper's 16 cores and 32 threads versus the Ryzen 9's 12 cores and 24 threads — a 33% core advantage that does not fully translate to performance due to scaling limits.

The Ryzen 9 PRO 9955 counters in two meaningful areas. Its PassMark find prime numbers score of 461 versus 337 is a striking 36.8% advantage — the largest single-test delta in either direction. Single-thread performance also favors the Ryzen 9, at 4,597 versus 4,530, a modest 1.5% edge. Both chips share a 5.40 GHz boost clock, so the single-thread difference stems from architectural nuances rather than raw frequency. The prime-number result is particularly notable because it suggests the Ryzen 9's per-core efficiency in integer-heavy, latency-bound loops exceeds what the core count difference would predict.

Average benchmark scores reinforce the split. The Ryzen 9 PRO 9955 averages 110,612 across all tests, while the Threadripper PRO 9955WX averages 101,041. Both sit at the 97th percentile among all CPUs, indicating top-tier placement regardless of workload. The Ryzen 9's higher average, despite losing most head-to-head tests, reflects its single-thread and prime-number wins pulling the mean upward relative to the Threadripper's broader but shallower multi-core spread.

Where Each One Wins

The Threadripper PRO 9955WX is the clear choice for parallel, data-heavy workflows. Its wins in data compression, encryption, extended instructions, floating-point math, integer math, multi-threaded PassMark, physics simulation, and random string sorting cover the full spectrum of multi-core productivity. The 25-28% margins in compression, extended instructions, and sorting indicate workloads that benefit from both core count and memory bandwidth will see the largest gains. The Threadripper's eight-channel memory bus, with 409.6 GB/s bandwidth versus the Ryzen 9's dual-channel 89.6 GB/s, underpins these results — data-intensive tasks scale with memory throughput, and the benchmark deltas track that hardware difference.

The Ryzen 9 PRO 9955 wins where single-thread efficiency and specific instruction patterns matter. Its 36.8% prime-number advantage suggests integer factorization and similar latency-bound algorithms run disproportionately well on this chip. The 1.5% single-thread lead, while small, is consistent across both single-thread test entries. For workloads that are primarily single-threaded or that depend on per-core integer throughput — legacy applications, certain scripting workloads, or interactive development — the Ryzen 9 holds a measurable edge. Its 120-watt TDP also makes it far more tractable for dense server deployments where thermal envelopes constrain core counts.

The use-case split is clean: the Threadripper PRO 9955WX targets compute-heavy rendering, simulation, and data processing; the Ryzen 9 PRO 9955 suits mixed workloads with significant serial components or those constrained by power and socket footprint. The Ryzen 9's Radeon integrated graphics add another differentiator — it can drive a display without a discrete GPU, while the Threadripper has no integrated graphics at all.

Architecture Differences

Both processors are built on TSMC's 4nm process with 16,630 million transistors across two 70.6 mm² dies, but they diverge in core configuration and platform integration. The Ryzen 9 PRO 9955, codenamed Granite Ridge, uses 12 cores and 24 threads with a 3.40 GHz base clock. The Threadripper PRO 9955WX, codenamed Shimada Peak, scales to 16 cores and 32 threads with a 4.50 GHz base clock. Both boost to 5.40 GHz, and both are listed as Zen 5 architecture in the Threadripper's case, while the Ryzen 9's generation is described as "Zen 5 (Granite Ridge)" — the discrepancy in generation labeling (the Threadripper's generation field references "Zen 4 (Storm Peak)") appears to be a data inconsistency rather than a true architectural difference, given the shared process node and cache structure.

Cache layouts differ notably. The Ryzen 9 PRO 9955 allocates 80 KB of L1 per core, while the Threadripper uses 64 KB per core. Both have 1 MB L2 per core and 64 MB L3 total. The L1 delta favors the Ryzen 9 in single-threaded code that frequently accesses per-core data, likely contributing to its prime-number and single-thread wins. The Threadripper's 64 MB L3, identical in size, does not compensate for the L1 deficit in latency-critical loops.

The platform separation is stark. The Ryzen 9 uses AMD Socket AM5 with 24 PCIe Gen 5 lanes (CPU only) and dual-channel DDR5 memory. The Threadripper uses AMD Socket sTR5 with 128 PCIe Gen 5 lanes (CPU only) and eight-channel DDR5 memory. Memory bandwidth scales from 89.6 GB/s to 409.6 GB/s — a 4.57x increase that explains the Threadripper's consistent wins in bandwidth-sensitive benchmarks. Both support ECC memory, a requirement for workstation reliability. The Threadripper has an unlocked multiplier; the Ryzen 9 does not, though the Ryzen 9's lower TDP of 120 watts versus 350 watts makes it the more power-efficient choice per watt in constrained environments.

FAQ

Q: Which CPU has better single-thread performance?

A: The AMD Ryzen 9 PRO 9955 scores 4,597 in PassMark single-thread tests, versus 4,530 for the Threadripper PRO 9955WX — a 1.5% advantage. Both share a 5.40 GHz boost clock, so the difference comes from per-core cache and microarchitectural factors.

Q: Why does the Threadripper PRO 9955WX win most multi-threaded benchmarks?

A: It has 16 cores and 32 threads versus 12 cores and 24 threads, plus eight-channel memory at 409.6 GB/s compared to dual-channel at 89.6 GB/s. The core and memory bandwidth advantages drive its 18-28% wins across multi-threaded PassMark tests.

Q: What is the largest performance gap between the two?

A: The Ryzen 9 PRO 9955 leads PassMark find prime numbers by 36.8% (461 vs. 337). The Threadripper's largest win is 28.1% in extended instructions (76,363 vs. 54,903).

Q: Do both CPUs support ECC memory?

A: Yes, both the AMD Ryzen 9 PRO 9955 and AMD Ryzen Threadripper PRO 9955WX support ECC memory, making both suitable for error-sensitive workstation and server workloads.

Q: Which CPU has integrated graphics?

A: Only the AMD Ryzen 9 PRO 9955 includes Radeon Graphics. The Threadripper PRO 9955WX has no integrated graphics, requiring a discrete GPU for display output.

Q: How do their average benchmark scores compare?

A: The Ryzen 9 PRO 9955 averages 110,612, while the Threadripper PRO 9955WX averages 101,041. Both rank at the 97th percentile among all CPUs, but the Ryzen 9's higher average reflects its single-thread and prime-number strengths pulling the mean up.

Specification Differences

| Specification | AMD Ryzen 9 PRO 9955 | AMD Ryzen Threadripper PRO 9955WX |

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

| Cores | 12 | 16 |

| Threads | 24 | 32 |

| Base Clock | 3.40 GHz | 4.50 GHz |

| Boost Clock | 5.40 GHz | 5.40 GHz |

| TDP | 120 W | 350 W |

| Socket | AMD Socket AM5 | AMD Socket sTR5 |

| Codename | Granite Ridge | Shimada Peak |

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

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

| L3 Cache | 64 MB | 64 MB |

| Memory Bus | Dual-channel | Eight-channel |

| Memory Bandwidth | 89.6 GB/s | 409.6 GB/s |

| PCIe | Gen 5, 24 Lanes (CPU only) | Gen 5, 128 Lanes (CPU only) |

| Integrated Graphics | Radeon Graphics | N/A |

| Market Segment | Server/Workstation | Desktop |

| Release Date | 2026-06-29 | 2025-07-22 |

| Launch MSRP | Not available | $1649 |

| Multiplier Unlocked | No | Yes |

The specification table captures the fundamental divide: the Threadripper PRO 9955WX trades power and platform size for raw throughput, while the Ryzen 9 PRO 9955 optimizes per-core efficiency and system integration. The Threadripper's 350-watt TDP and 128 PCIe lanes target full-scale workstation builds, whereas the Ryzen 9's 120-watt envelope and 24 lanes fit standard AM5 motherboards. The eight-channel memory subsystem is the Threadripper's strongest differentiator, delivering 4.57x the bandwidth of the Ryzen 9's dual-channel configuration. The Ryzen 9's newer release date and integrated graphics make it the more self-contained option, though the Threadripper's unlocked multiplier offers overclocking headroom for users who can manage its thermal demands.