AMD Ryzen 9 9955HX3D vs AMD Ryzen Threadripper PRO 9955WX Comparison

The AMD Ryzen Threadripper PRO 9955WX and the AMD Ryzen 9 9955HX3D are both 16-core Zen 5 parts, yet they serve completely different worlds: one is a desktop workstation behemoth, the other a mobile powerhouse. Both share the same 4 nm TSMC process and a 5.40 GHz boost clock, but their benchmark profiles diverge sharply. The Threadripper PRO 9955WX wins 12 of 15 head-to-head tests, while the Ryzen 9 9955HX3D takes three, making this a fascinating study in how architecture and platform choices dictate performance.

Head-to-Head Benchmarks

The most dramatic split appears in Cinebench results. In Cinebench R23 single-core, the Threadripper PRO 9955WX scores 8399 against the Ryzen 9 9955HX3D’s 2159.5, a staggering 288.9% advantage. That gap is not a small margin; it is a generational chasm, likely reflecting the mobile chip’s power constraints. The R23 multi-core test also favors the desktop part heavily: 59494 versus 38161.5, a 55.9% lead. The Cinebench R15 single-core test tells a similar story, with the Threadripper at 846 versus 332 (154.8% delta), though the R15 multi-core result is a rare bright spot for the mobile chip, which edges ahead 6042.5 to 5996 (a slim -0.8% delta for the Threadripper).

PassMark tests largely reinforce the desktop chip’s dominance, but with varying margins. In data compression, the Threadripper scores 920954 versus 785811, a 17.2% win. Data encryption shows a 12.5% edge (44389 vs 39446), and extended instructions land at 21.6% (76363 vs 62813). Random string sorting is another decisive victory: 99813 versus 83497, a 19.5% gap. Floating-point math (156215 vs 144122, 8.4%) and integer math (236120 vs 222503, 6.1%) are closer but still favor the Threadripper. The PassMark multithread score is a 7% win for the desktop part (67035 vs 62674). Even the single-thread PassMark test, often a great equalizer, goes to the Threadripper, albeit narrowly: 4530 versus 4511, a 0.4% margin.

The Ryzen 9 9955HX3D’s three wins are specific and telling. In PassMark find prime numbers, it scores 525 versus 337, a massive 35.8% advantage for the mobile chip. PassMark physics also goes its way: 4687 versus 4156, an 11.3% lead. Finally, the Cinebench R15 multi-core result, as noted, is a narrow win. These wins suggest that the 9955HX3D’s larger L3 cache (128 MB vs 64 MB) pays off in certain integer-heavy and physics workloads, even at a much lower 55 W TDP compared to the Threadripper’s 350 W.

Where Each One Wins

The AMD Ryzen Threadripper PRO 9955WX is the clear winner for sustained, multi-threaded productivity and content creation. Its Cinebench R23 multi-core score of 59494 is nearly 56% higher than the mobile part’s, making it the better choice for rendering, video encoding, and heavy compilation workloads. The data compression and encryption results (920954 and 44389, respectively) also point to advantages in database work, archiving, and security-related tasks. The desktop chip’s 8.4% edge in floating-point math (156215 vs 144122) further cements its role in scientific computing and 3D rendering where FP math dominates.

The Ryzen 9 9955HX3D, despite its mobile pedigree, wins in specific niche areas. Its 35.8% lead in prime number finding (525 vs 337) suggests a unique strength in certain algorithmic or cryptographic workloads that benefit from its 128 MB L3 cache. The 11.3% win in PassMark physics (4687 vs 4156) indicates an advantage in simulation and physics-based game logic, likely a direct result of the larger cache reducing memory latency. The Cinebench R15 multi-core tie (within 0.8%) shows that in short, bursty multi-threaded tasks, the mobile chip can hold its own despite the TDP disparity.

For single-threaded responsiveness, the Threadripper PRO 9955WX dominates on paper, but the real-world story is more nuanced. The 288.9% delta in Cinebench R23 single-core (8399 vs 2159.5) is enormous, yet the PassMark single-thread scores are nearly identical (4530 vs 4511). This discrepancy suggests the Threadripper’s higher base clock (4.50 GHz vs 2.50 GHz) allows it to sustain turbo frequencies better in short bursts, while the 9955HX3D’s long-term single-thread performance is limited by its 55 W envelope.

The Verdict

The data clearly favors the AMD Ryzen Threadripper PRO 9955WX for anyone building a stationary workstation. It wins 12 of 15 benchmarks, with decisive margins in almost every category that matters for professional workloads. Its 97th percentile ranking among all CPUs (versus 96th for the 9955HX3D) and higher average benchmark score (101041 vs 97453) confirm its status as the more powerful processor. The Threadripper’s eight-channel memory bus (409.6 GB/s vs 89.6 GB/s) and 128 PCIe Gen 5 lanes (versus 28) are not benchmark scores, but they are structural advantages that make it suitable for multi-GPU setups and massive memory configurations.

The AMD Ryzen 9 9955HX3D is a different beast. It is a mobile chip (Socket FL1), and its 55 W TDP makes it feasible in laptops where the Threadripper’s 350 W TDP is physically impossible. Its wins in prime numbers and physics, plus a near-tie in Cinebench R15 multi-core, show that it is not a slouch. However, its overall lower scores and 96th percentile ranking position it as a high-end mobile option rather than a desktop replacement. The launch MSRP for the Threadripper PRO 9955WX is $1649; the 9955HX3D has no listed launch MSRP, but it logically targets a different market segment.

Pick the Threadripper PRO 9955WX if you need maximum multi-threaded throughput, high memory bandwidth, or extensive PCIe connectivity, and you can accommodate a 350 W TDP. Pick the Ryzen 9 9955HX3D if you need a 16-core/32-thread Zen 5 processor in a mobile form factor and can tolerate lower sustained performance in exchange for portability. There is no overlap in their intended use cases, and the benchmark data supports that division.

FAQ

Q: Which processor has a higher single-core score in Cinebench R23?

A: The AMD Ryzen Threadripper PRO 9955WX scores 8399, which is 288.9% higher than the AMD Ryzen 9 9955HX3D’s 2159.5.

Q: Does the mobile chip ever beat the desktop chip in multi-threaded tests?

A: Yes, in Cinebench R15 multi-core, the Ryzen 9 9955HX3D scores 6042.5 versus 5996, a 0.8% margin. It also wins PassMark find prime numbers by 35.8% and PassMark physics by 11.3%.

Q: What is the difference in L3 cache size?

A: The Ryzen 9 9955HX3D has 128 MB of L3 cache, while the Ryzen Threadripper PRO 9955WX has 64 MB. Both have 1 MB of L2 cache per core, but the L1 cache differs: 80 KB per core for the mobile chip versus 64 KB per core for the desktop part.

Q: How do their memory bandwidth capabilities compare?

A: The Threadripper PRO 9955WX supports eight-channel DDR5 memory with 409.6 GB/s bandwidth, whereas the Ryzen 9 9955HX3D is dual-channel with 89.6 GB/s. Both support ECC memory.

Q: Are both processors on the same manufacturing process?

A: Yes, both are built on a 4 nm process at TSMC, with the same transistor count of 16,630 million and a die size of 2x 70.6 mm².

Q: What are their respective TDPs?

A: The Ryzen Threadripper PRO 9955WX has a 350 W TDP, while the Ryzen 9 9955HX3D has a 55 W TDP. Both have a 5.40 GHz boost clock, but the Threadripper’s base clock is 4.50 GHz versus 2.50 GHz for the mobile chip.

Architecture Differences

The architectural split between these two CPUs is profound despite shared Zen 5 DNA. The Ryzen Threadripper PRO 9955WX uses the Shimada Peak codename and fits the AMD Socket sTR5, while the Ryzen 9 9955HX3D is codenamed Fire Range and uses AMD Socket FL1. Both are 4 nm TSMC parts with 16,630 million transistors on a 2x 70.6 mm² die, but their cache hierarchies differ: the desktop chip has 64 KB of L1 per core and 64 MB of L3, while the mobile chip has 80 KB of L1 per core and a much larger 128 MB of L3. This larger L3 is the “3D” in the HX3D name, and it explains the mobile part’s wins in cache-sensitive workloads like prime number finding.

The platform differences are even more stark. The Threadripper PRO 9955WX supports eight-channel DDR5 memory with a theoretical bandwidth of 409.6 GB/s and offers 128 PCIe Gen 5 lanes from the CPU alone. The Ryzen 9 9955HX3D is limited to dual-channel memory (89.6 GB/s) and 28 PCIe Gen 5 lanes. The desktop chip has no integrated graphics, while the mobile part includes a Radeon 610M iGPU. Both have unlocked multipliers, but the Threadripper’s 350 W TDP versus the mobile chip’s 55 W TDP reflects their different power delivery and cooling requirements. The Threadripper PRO 9955WX was released on 2025-07-22, while the Ryzen 9 9955HX3D came out earlier on 2025-01-05. In terms of nearest rivals, the Threadripper PRO 9955WX sits within 2.6% of the AMD EPYC 7513 and 1.7% of the EPYC 4585PX, while the Ryzen 9 9955HX3D is within 1.9% of the EPYC 9175F and 1.4% of the Ryzen 9 PRO 9945.