AMD Ryzen 9 9955HX vs AMD Ryzen AI Embedded P185 Comparison

The Verdict

The benchmark data is unambiguous: the AMD Ryzen 9 9955HX wins all 11 recorded head-to-head comparisons against the AMD Ryzen AI Embedded P185. The Ryzen 9 9955HX delivers an average benchmark score of 91199, placing it in the 96th percentile of all CPUs, while the Ryzen AI Embedded P185 records 62839 and sits in the 93rd percentile. The gap is substantial: the Ryzen 9 9955HX outperforms the P185 by roughly 45% in average score (91199 versus 62839). For workloads that stress multi-threaded throughput, integer math, or data compression, the Ryzen 9 9955HX is the clear choice. The Ryzen AI Embedded P185, however, is the more power-conscious option, with a 28 W TDP versus 55 W, and it integrates the Radeon 890M graphics, which is a different class of integrated GPU than the Radeon 610M in the Ryzen 9 9955HX. Users who need maximum compute density, especially in mobile or embedded form factors with tight thermal envelopes, would favor the P185. Users who need raw performance and do not prioritize power draw should select the Ryzen 9 9955HX.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 9 9955HX has 16 cores and 32 threads. The AMD Ryzen AI Embedded P185 has 12 cores and 24 threads.

Q: What is the performance difference in multi-threaded workloads?

A: In the PassMark multithread test, the Ryzen 9 9955HX scores 56171, which is 76.5% higher than the P185's 31817. The Ryzen 9 9955HX also leads in Cinebench R23 multi-core with 37159, though the P185 has no recorded Cinebench scores in the database.

Q: How do the single-thread scores compare?

A: The Ryzen 9 9955HX scores 4393 in the PassMark single-thread test, which is 10.5% ahead of the P185's 3977. In Cinebench R23 single-core, the Ryzen 9 9955HX records 2174, and in Cinebench R15 single-core it records 336.

Q: Which processor has a larger L3 cache?

A: The Ryzen 9 9955HX has 64 MB of shared L3 cache. The Ryzen AI Embedded P185 has 16 MB of L3 cache. Both have 80 KB of L1 cache per core and 1 MB of L2 cache per core.

Q: What are the memory and PCIe capabilities of each?

A: Both support dual-channel memory with 89.6 GB/s bandwidth and ECC memory. The Ryzen 9 9955HX supports DDR5 and provides PCIe Gen 5 with 28 lanes (CPU only). The Ryzen AI Embedded P185 supports DDR5 and LPDDR5X, but provides PCIe Gen 4 with 16 lanes (CPU only).

Q: Which processor is unlocked for overclocking?

A: The Ryzen 9 9955HX has an unlocked multiplier. The Ryzen AI Embedded P185 does not have an unlocked multiplier.

Architecture Differences

The Ryzen 9 9955HX belongs to the 9000 series and uses the Zen 5 architecture on the Fire Range codename. It is built on a 4 nm process at TSMC, with a die size of 2x 70.6 mm² and a transistor count of 16,630 million. The Ryzen AI Embedded P185 uses a hybrid Zen 5 / Zen 5c configuration under the Gorgon Point codename, also on a 4 nm TSMC process, but with a single 233 mm² die and no recorded transistor count. This architectural split explains part of the performance and efficiency difference: the P185 uses efficiency-oriented Zen 5c cores in part of its design, while the Ryzen 9 9955HX uses full Zen 5 cores across all 16.

The integrated graphics differ significantly. The Ryzen 9 9955HX includes a Radeon 610M, while the Ryzen AI Embedded P185 includes a Radeon 890M. The Radeon 890M is the higher-tier integrated GPU, which matters for systems that rely on the iGPU for display output or light graphics workloads. The Ryzen 9 9955HX compensates with more CPU lanes and a newer PCIe generation: Gen 5 with 28 lanes versus Gen 4 with 16 lanes on the P185.

The socket and platform also diverge. The Ryzen 9 9955HX uses AMD Socket FL1, while the P185 uses AMD Socket FP8. This means motherboard compatibility is not interchangeable between the two. The P185 is also a locked part, with no unlocked multiplier, while the Ryzen 9 9955HX allows overclocking. The release dates differ as well: the Ryzen 9 9955HX launched on 2025-01-05, and the P185 launched later on 2026-02-28.

Specification Differences

| Specification | AMD Ryzen 9 9955HX | AMD Ryzen AI Embedded P185 |

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

| Cores | 16 | 12 |

| Threads | 32 | 24 |

| Base clock | 2.50 GHz | 2.00 GHz |

| Boost clock | 5.40 GHz | 5.10 GHz |

| TDP | 55 W | 28 W |

| Socket | AMD Socket FL1 | AMD Socket FP8 |

| Codename | Fire Range | Gorgon Point |

| Generation | Ryzen 9 (Zen 5 (Fire Range)) | Ryzen AI Embedded (Zen 5 / Zen 5c) |

| Die size | 2x 70.6 mm² | 233 mm² |

| Transistors | 16,630 million | Not recorded |

| L3 cache | 64 MB (shared) | 16 MB |

| Memory support | DDR5 | DDR5, LPDDR5X |

| PCIe | Gen 5, 28 Lanes (CPU only) | Gen 4, 16 Lanes (CPU only) |

| Integrated graphics | Radeon 610M | Radeon 890M |

| Multiplier unlocked | Yes | No |

| Part number | 100-000001028 | Unknown |

| Release date | 2025-01-05 | 2026-02-28 |

Both processors share the same L1 cache (80 KB per core), L2 cache (1 MB per core), memory bus width (dual-channel), memory bandwidth (89.6 GB/s), ECC support, process node (4 nm), foundry (TSMC), market segment (Mobile), and production status (Active). The Ryzen 9 9955HX has no launch MSRP recorded, and neither does the P185.

Head-to-Head Benchmarks

The Ryzen 9 9955HX wins every recorded head-to-head benchmark, and the margins are often large. The biggest single advantage appears in PassMark find prime numbers, where the Ryzen 9 9955HX scores 287 versus 129, a 122.5% lead. This test is highly sensitive to core count and clock speed, and the Ryzen 9 9955HX has both advantages: 16 cores at up to 5.40 GHz versus 12 cores at up to 5.10 GHz.

The extended instructions test shows a similarly large gap. The Ryzen 9 9955HX records 57946, which is 118.3% ahead of the P185's 26544. This indicates that the Ryzen 9 9955HX handles AVX-style workloads with substantially more throughput, likely due to its higher core count and full Zen 5 implementation.

Data compression favors the Ryzen 9 9955HX by 95.5%. Its score of 731998 dwarfs the P185's 374429. Data encryption shows a 90.3% lead (37330 versus 19612), and floating-point math shows a 93.6% lead (136682 versus 70587). These results confirm that the Ryzen 9 9955HX is not just faster in synthetic multi-thread tests, but also in real-world compute patterns that rely on parallel integer and floating-point execution.

The smallest margin is in single-thread performance. The Ryzen 9 9955HX scores 4393 versus 3977, a 10.5% advantage. This is still a clear win, but it shows that the P185's Zen 5c cores are competitive in lightly threaded tasks. In Cinebench R23 single-core, the Ryzen 9 9955HX records 2174, and in R15 single-core it records 336, though no comparable P185 Cinebench scores exist in the database.

The multithread test shows a 76.5% lead (56171 versus 31817), and the physics test shows a 53.5% lead (2720 versus 1772). Random string sorting shows a 92.1% advantage (77890 versus 40557). The integer math test shows an 80.4% lead (212598 versus 117832). Across all 11 comparisons, the Ryzen 9 9955HX dominates, with no recorded wins for the P185.

The nearest rivals in the database provide context. The Ryzen 9 9955HX's average score of 91199 places it slightly above the AMD Ryzen AI Max+ 392 (90541, +0.7%) and nearly even with the Intel Xeon 654 (90717, +0.5%). It trails the Intel Core Ultra 7 270K Plus (93785, -2.8%) and Intel Xeon 6520P (93786, -2.8%). The P185's average of 62839 sits close to the Intel Core Ultra 7 255HX (62738, +0.2%) and AMD Ryzen AI 9 PRO 465 (62498, +0.5%), while slightly behind the Intel Core i7-13790F (63080, -0.4%) and Intel Core Ultra 7 265HX (63173, -0.5%). The P185 is thus positioned in a lower performance tier, roughly 31% below the Ryzen 9 9955HX in average score (62839 versus 91199).

The recorded data shows a processor designed for maximum throughput in the Ryzen 9 9955HX, and a power-optimized embedded part in the P185. The P185 does not win any benchmark, but its lower TDP and newer integrated graphics make it a reasonable pick for systems where power envelope and GPU capability matter more than raw CPU compute.