AMD Ryzen 9 9955HX vs AMD Ryzen AI 9 365 Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive sweep: the AMD Ryzen 9 9955HX wins all 15 head-to-head benchmark comparisons against the AMD Ryzen AI 9 365. No benchmark in the database favors the Ryzen AI 9 365. The margin is substantial across every category, ranging from a 9.1% single-core advantage to a 145.3% lead in prime number computation.

The most dramatic gap appears in Cinebench R15 multi-core, where the Ryzen 9 9955HX scores 5905 against 2842 for the Ryzen AI 9 365, a 107.8% difference. Cinebench R23 multi-core tells a similar story: 37159 versus 18698, a 98.7% lead. These results indicate that heavily threaded rendering workloads are dominated by the 16-core part.

Single-core performance is closer but still clearly favors the Ryzen 9 9955HX. In Cinebench R15 single-core, the scores are 336 versus 303, a 10.9% edge. Cinebench R23 single-core shows 2174 against 1992, a 9.1% advantage. PassMark single-thread results show 4393 versus 3841, a 14.4% lead for the larger chip.

The PassMark suite reveals consistent scaling across workload types. Integer math scores 212598 versus 101831, a 108.8% difference. Floating point math shows 136682 versus 62802, a 117.6% lead. Extended instructions deliver 57946 versus 25113, a 130.7% gap. Data compression reaches 731998 versus 354510, a 106.5% difference, while data encryption hits 37330 versus 18297, a 104% advantage.

Memory-sensitive and latency-bound tasks also favor the Ryzen 9 9955HX. Random string sorting scores 77890 against 39447, a 97.5% lead. Physics simulation shows 2720 versus 1704, a 59.6% difference, the narrowest multi-core gap in the data. Find prime numbers returns 287 versus 117, the largest relative margin at 145.3%.

The average benchmark score for the Ryzen 9 9955HX is 91199, placing it in the 96th percentile of all CPUs in the database. The Ryzen AI 9 365 averages 40048, good for the 87th percentile. The nearest rival to the Ryzen 9 9955HX is the Intel Xeon 654 with an average score of 90717, a delta of 0.5%. The nearest rival to the Ryzen AI 9 365 is the AMD Ryzen 7 7700 at 40081, a delta of -0.1%.

Architecture Differences

Both chips use the Zen 5 architecture and are manufactured by TSMC on a 4 nm process, but they belong to different families with distinct designs. The Ryzen 9 9955HX carries the Fire Range codename and belongs to the 9000 series, while the Ryzen AI 9 365 uses the Strix Point codename from the Ryzen AI 300 series.

The core counts differ substantially. The Ryzen 9 9955HX has 16 cores and 32 threads, while the Ryzen AI 9 365 has 10 cores and 20 threads. The Ryzen AI 9 365 uses a hybrid configuration described as Zen 5 / Zen 5c, whereas the Ryzen 9 9955HX uses uniform Zen 5 cores. This explains part of the multi-core performance gap.

Clock speeds follow the core count difference. The Ryzen 9 9955HX has a base clock of 2.50 GHz and a boost clock of 5.40 GHz. The Ryzen AI 9 365 runs at a 2.00 GHz base and 5.00 GHz boost. The higher clocks on the 16-core part contribute to its single-core wins as well.

Cache configuration is another major divergence. The Ryzen 9 9955HX has 64 MB of shared L3 cache. The Ryzen AI 9 365 has only 16 MB of L3 cache. Both share the same per-core L1 (80 KB) and L2 (1 MB) sizes, but the L3 difference is a 4x multiplier in favor of the larger chip.

The transistor counts reflect the design gap. The Ryzen 9 9955HX uses 16,630 million transistors spread across two 70.6 mm² dies. The Ryzen AI 9 365 uses a single 233 mm² die, and the database does not list its transistor count. The dual-die approach on the Ryzen 9 9955HX likely explains its much larger cache pool.

Power envelopes differ significantly. The Ryzen 9 9955HX is rated at 55 W TDP, while the Ryzen AI 9 365 is rated at 28 W TDP. The 27 W difference directly correlates with the capability gap, though the database does not measure power efficiency directly.

Platform support also differs. The Ryzen 9 9955HX uses AMD Socket FL1 and supports PCIe Gen 5 with 28 CPU lanes. The Ryzen AI 9 365 uses AMD Socket FP8 with PCIe Gen 4 and 16 CPU lanes. The Ryzen 9 9955HX supports ECC memory; the Ryzen AI 9 365 does not. Both use DDR5 memory in a dual-channel configuration with 89.6 GB/s bandwidth, though the Ryzen AI 9 365 additionally supports LPDDR5X.

Integrated graphics differ as well. The Ryzen 9 9955HX ships with Radeon 610M, while the Ryzen AI 9 365 includes the Radeon 880M. The database does not include GPU benchmarks, so the comparison stops at the specification level.

Where Each One Wins

The Ryzen 9 9955HX wins every benchmark category in the database. Its largest margins come from compute-heavy integer and floating point workloads, extended instruction sets, and prime number finding. These are tasks that scale with core count, thread count, and cache size. For rendering, compilation, scientific simulation, and data processing, the data points strongly to the 16-core part.

The Ryzen 9 9955HX also leads in memory-intensive tasks like data compression and random string sorting, where the 64 MB L3 cache provides a significant advantage. The 145.3% lead in prime number finding underscores the benefit of 32 threads and large shared cache.

The Ryzen AI 9 365 shows no benchmark wins in the recorded data. Its single-core performance is within 9.1% to 14.4% of the Ryzen 9 9955HX, which is a smaller gap than its multi-core deficit. For workloads that are lightly threaded, the Ryzen AI 9 365 is closer to parity, though still behind. Its 28 W TDP and lower core count make it a more power-conscious option, but the database does not include efficiency metrics, so this remains a specification-level observation rather than a benchmark conclusion.

The narrowest gap is in physics simulation, where the Ryzen 9 9955HX leads by 59.6%. This suggests that physics workloads, which often depend on a mix of single-thread speed and moderate multi-threading, are the most competitive area for the Ryzen AI 9 365 relative to the larger chip.

The Verdict

The data is unambiguous. The AMD Ryzen 9 9955HX outperforms the AMD Ryzen AI 9 365 in every recorded benchmark, with multi-core advantages approaching or exceeding 100% in several tests. The 16-core, 32-thread configuration with 64 MB of L3 cache and a 5.40 GHz boost clock delivers consistently higher scores across rendering, math, encryption, compression, and sorting workloads.

The Ryzen AI 9 365 is a 10-core, 20-thread part with a 16 MB L3 cache and a 5.00 GHz boost clock. It is the smaller, lower-power option with a 28 W TDP and a more compact single-die design. Its single-core performance trails by roughly 9% to 14%, a meaningful but not overwhelming margin. Its multi-core performance trails by 59.6% to 145.3%, depending on the workload.

For buyers who prioritize raw compute throughput, the Ryzen 9 9955HX is the clear choice from this data. For buyers who prioritize a smaller package, lower power envelope, or integrated graphics with more execution units, the Ryzen AI 9 365 has specification-level advantages, but benchmark performance in the database does not favor it in any category. The Ryzen 9 9955HX sits in the 96th percentile of all CPUs, while the Ryzen AI 9 365 sits in the 87th percentile. The average score gap is 91199 versus 40048, a 127.7% difference.

FAQ

Q: Which CPU is faster in multi-core workloads?

A: The AMD Ryzen 9 9955HX wins all multi-core benchmarks. In Cinebench R23 multi-core, it scores 37159 versus 18698 for the Ryzen AI 9 365, a 98.7% lead. PassMark multithread shows 56171 versus 29467, a 90.6% advantage.

Q: How big is the single-core performance gap?

A: The Ryzen 9 9955HX leads in every single-core test. Cinebench R23 single-core shows 2174 versus 1992, a 9.1% edge. PassMark single-thread shows 4393 versus 3841, a 14.4% lead.

Q: Do both CPUs use the same architecture?

A: Both use Zen 5 architecture on a 4 nm TSMC process. The Ryzen 9 9955HX uses uniform Zen 5 cores, while the Ryzen AI 9 365 uses a hybrid Zen 5 / Zen 5c configuration.

Q: What is the cache difference?

A: The Ryzen 9 9955HX has 64 MB of shared L3 cache. The Ryzen AI 9 365 has 16 MB of L3 cache. Both have 80 KB of L1 per core and 1 MB of L2 per core.

Q: Which CPU supports ECC memory?

A: The Ryzen 9 9955HX supports ECC memory. The Ryzen AI 9 365 does not.

Q: How do their platform specifications differ?

A: The Ryzen 9 9955HX uses AMD Socket FL1 with PCIe Gen 5 and 28 CPU lanes. The Ryzen AI 9 365 uses AMD Socket FP8 with PCIe Gen 4 and 16 CPU lanes. The Ryzen 9 9955HX has a 55 W TDP, while the Ryzen AI 9 365 has a 28 W TDP.

Specification Differences

| Specification | AMD Ryzen 9 9955HX | AMD Ryzen AI 9 365 |

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

| Cores | 16 | 10 |

| Threads | 32 | 20 |

| Base Clock | 2.50 GHz | 2.00 GHz |

| Boost Clock | 5.40 GHz | 5.00 GHz |

| TDP | 55 W | 28 W |

| Socket | AMD Socket FL1 | AMD Socket FP8 |

| Codename | Fire Range | Strix Point |

| Generation | Ryzen 9 (Zen 5 (Fire Range)) | Ryzen AI 300 (Zen 5 / Zen 5c) |

| Transistors | 16,630 million | Not listed |

| Die Size | 2x 70.6 mm² | 233 mm² |

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

| Memory Support | DDR5 | DDR5, LPDDR5X |

| ECC Memory | Yes | No |

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

| Integrated Graphics | Radeon 610M | Radeon 880M |

| Multiplier Unlocked | Yes | No |

| Release Date | 2025-01-05 | 2024-06-30 |