AMD Ryzen 9 9955HX3D vs AMD Ryzen AI 5 PRO 435 Comparison

Head-to-Head Benchmarks

The recorded data shows a complete sweep for the AMD Ryzen 9 9955HX3D, winning all 11 head-to-head benchmark comparisons against the AMD Ryzen AI 5 PRO 435. The largest margin appears in the passmark_find_prime_numbers test, where the Ryzen 9 9955HX3D scores 525 against 57 for the Ryzen AI 5 PRO 435, a delta of 821.1%. This is the most extreme gap in the dataset, reflecting the substantial difference in raw compute capability between the two mobile processors.

The second-largest advantage is in passmark_physics, with the Ryzen 9 9955HX3D scoring 4687 versus 995, a delta of 371.1%. Physics workloads often exercise the memory subsystem and core scaling, and the data indicates the 16-core part delivers more than four times the throughput of the 6-core chip. Similarly, passmark_extended_instructions shows a 275.6% delta, with scores of 62813 and 16724 respectively. This test measures AVX-style instruction throughput, and the difference aligns with the core count and cache hierarchy disparity.

In passmark_integer_math, the Ryzen 9 9955HX3D posts 222503 against 60879, a 265.5% delta. Floating-point math shows a parallel story: 144122 versus 41114, a 250.5% delta. Data encryption delivers a 250.1% delta, with 39446 versus 11267. These results indicate that the Ryzen 9 9955HX3D maintains its dominance across both integer and floating-point workloads, not just in one specialized area.

The passmark_data_compression test shows 785811 for the Ryzen 9 9955HX3D against 232803 for the Ryzen AI 5 PRO 435, a 237.5% delta. Compression workloads are memory-latency sensitive, and the Ryzen 9 9955HX3D's larger L3 cache likely contributes to this advantage. Random string sorting follows at 234.8% delta, with scores of 83497 and 24936. The multithread score shows 62674 versus 19091, a 228.3% delta, which is the smallest of the multi-threaded gaps but still represents more than three times the throughput.

The closest contest appears in single-threaded performance. The passmark_single_thread test records 4511 for the Ryzen 9 9955HX3D and 3757 for the Ryzen AI 5 PRO 435, a delta of 20.1%. This is the only benchmark where the two processors are within a comparable range, suggesting that per-core efficiency is relatively similar, but the Ryzen 9 9955HX3D still holds a clear edge. The same result repeats for passmark_singlethread, confirming consistency in the measurement.

When placed against the broader database, the Ryzen 9 9955HX3D sits in the 96th percentile of all CPUs, while the Ryzen AI 5 PRO 435 occupies the 86th percentile. The average benchmark score for the Ryzen 9 9955HX3D is 97453, versus 37762 for the Ryzen AI 5 PRO 435. The Ryzen 9 9955HX3D's nearest rivals include the AMD Ryzen Threadripper PRO 5965WX at 98504 (1.1% ahead), the AMD Ryzen 9 PRO 9945 at 96083 (1.4% behind), the AMD EPYC 4565P at 95764 (1.8% behind), and the AMD EPYC 9175F at 95615 (1.9% behind). The Ryzen AI 5 PRO 435's nearest rivals are much closer in aggregate: the AMD Ryzen AI Embedded P132 at 37804 (0.1% ahead), the Intel Core 5 211E at 37829 (0.2% ahead), the Intel Core i5-13600K at 37685 (0.2% behind), and the AMD Ryzen AI 9 HX 370 at 37904 (0.4% ahead). This contrast shows that the Ryzen AI 5 PRO 435 competes in a dense performance band, while the Ryzen 9 9955HX3D sits among higher-tier desktop and workstation parts.

FAQ

Q: Which processor wins the most benchmarks in the head-to-head comparison?

A: The AMD Ryzen 9 9955HX3D wins all 11 recorded head-to-head benchmark comparisons. The AMD Ryzen AI 5 PRO 435 wins zero.

Q: What is the smallest performance gap between the two processors?

A: The smallest gap is in single-threaded performance. The passmark_single_thread test shows 4511 for the Ryzen 9 9955HX3D versus 3757 for the Ryzen AI 5 PRO 435, a delta of 20.1%.

Q: How do the two processors compare in aggregate benchmark scores?

A: The Ryzen 9 9955HX3D has an average benchmark score of 97453, placing it in the 96th percentile of all CPUs. The Ryzen AI 5 PRO 435 has an average benchmark score of 37762, placing it in the 86th percentile.

Q: What is the largest single benchmark margin between them?

A: The passmark_find_prime_numbers test shows the largest margin. The Ryzen 9 9955HX3D scores 525, while the Ryzen AI 5 PRO 435 scores 57, a delta of 821.1%.

Q: Are both processors based on the same architecture?

A: Yes, both use Zen 5 architecture and are manufactured on a 4 nm process by TSMC. However, they come from different codenames: Fire Range for the Ryzen 9 9955HX3D and Gorgon Point for the Ryzen AI 5 PRO 435.

Q: Do both processors support the same memory types?

A: The Ryzen 9 9955HX3D supports DDR5 only. The Ryzen AI 5 PRO 435 supports both DDR5 and LPDDR5X. Both use a dual-channel memory bus with 89.6 GB/s bandwidth.

Architecture Differences

The two processors share a common foundation: both are built on Zen 5 architecture, use a 4 nm process node, and are fabricated by TSMC. However, the implementation details diverge substantially. The Ryzen 9 9955HX3D comes from the Fire Range codename within the 9000 series, while the Ryzen AI 5 PRO 435 belongs to the Gorgon Point codename in the Ryzen AI PRO 400 generation, which mixes Zen 5 and Zen 5c cores.

The core count difference is the most obvious architectural gap. The Ryzen 9 9955HX3D has 16 cores and 32 threads, while the Ryzen AI 5 PRO 435 has 6 cores and 12 threads. This 10-core difference drives most of the multi-threaded performance gap. Clock speeds also differ: the Ryzen 9 9955HX3D operates at a 2.50 GHz base clock and 5.40 GHz boost clock, while the Ryzen AI 5 PRO 435 runs at 2.00 GHz base and 4.50 GHz boost. The Ryzen 9 9955HX3D has an unlocked multiplier, while the Ryzen AI 5 PRO 435 does not.

Cache configuration shows a major divergence. Both parts have 80 KB of L1 cache per core and 1 MB of L2 cache per core. The L3 cache, however, is dramatically different: the Ryzen 9 9955HX3D has 128 MB of L3 cache, while the Ryzen AI 5 PRO 435 has only 4 MB. This 124 MB difference is likely the single largest architectural factor separating the two, and it helps explain the Ryzen 9 9955HX3D's strong showing in cache-sensitive workloads like data compression and random string sorting.

The transistor count for the Ryzen 9 9955HX3D is recorded as 16,630 million, spread across a die size of 2x 70.6 mm². The Ryzen AI 5 PRO 435 has no recorded transistor count or die size in the database. Both processors support ECC memory, but the Ryzen 9 9955HX3D uses PCIe Gen 5 with 28 lanes, while the Ryzen AI 5 PRO 435 uses PCIe Gen 4 with 14 lanes. This halves the PCIe lane count and drops to the previous generation of PCIe signaling.

The integrated graphics differ as well. The Ryzen 9 9955HX3D carries a Radeon 610M, while the Ryzen AI 5 PRO 435 carries a Radeon 840M. The socket types are also different: the Ryzen 9 9955HX3D uses AMD Socket FL1, and the Ryzen AI 5 PRO 435 uses AMD Socket FP8. The thermal design power differs, with the Ryzen 9 9955HX3D rated at 55 W and the Ryzen AI 5 PRO 435 at 28 W.

The Verdict

The benchmark data points to two distinct usage profiles. The Ryzen 9 9955HX3D is the clear choice for workloads that demand maximum multi-threaded throughput and large cache capacity. Its 16 cores, 32 threads, and 128 MB L3 cache deliver scores that place it in the 96th percentile of all CPUs. The nearest rival data shows it trading places with the AMD Ryzen Threadripper PRO 5965WX, a workstation-class part, and sitting just ahead of the AMD Ryzen 9 PRO 9945 and the AMD EPYC 4565P. This positions the Ryzen 9 9955HX3D as a mobile processor that performs at desktop or workstation levels.

The Ryzen AI 5 PRO 435, by contrast, sits in a much more modest performance tier. Its 86th percentile ranking and average benchmark score of 37762 place it alongside parts like the Intel Core i5-13600K and the AMD Ryzen AI 9 HX 370. The delta values against these rivals are all within 0.4%, indicating that the Ryzen AI 5 PRO 435 is essentially at parity with its nearest competitors. For single-threaded tasks, the gap to the Ryzen 9 9955HX3D narrows to 20.1%, suggesting that the per-core architecture is competent but the lower boost clock and smaller cache hold it back.

The data supports a clear conclusion: the Ryzen 9 9955HX3D is for users who need maximum compute density in a mobile package, particularly for multi-threaded rendering, compilation, or simulation workloads. The Ryzen AI 5 PRO 435 is for users who need a power-efficient processor with adequate performance for mainstream tasks, where the 28 W TDP and support for LPDDR5X memory offer flexibility that the larger chip does not. The choice comes down to whether the workload demands the 128 MB L3 cache and 32 threads of the Ryzen 9 9955HX3D, or whether the lower power envelope and newer integrated graphics of the Ryzen AI 5 PRO 435 are more relevant.

Specification Differences

| Specification | AMD Ryzen 9 9955HX3D | AMD Ryzen AI 5 PRO 435 |

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

| Cores | 16 | 6 |

| Threads | 32 | 12 |

| Base Clock | 2.50 GHz | 2.00 GHz |

| Boost Clock | 5.40 GHz | 4.50 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 PRO 400 (Zen 5 / Zen 5c) |

| Transistors | 16,630 million | Not recorded |

| Die Size | 2x 70.6 mm² | Not recorded |

| L3 Cache | 128 MB | 4 MB |

| Memory Support | DDR5 | DDR5, LPDDR5X |

| PCIe | Gen 5, 28 Lanes (CPU only) | Gen 4, 14 Lanes (CPU only) |

| Integrated Graphics | Radeon 610M | Radeon 840M |

| Multiplier Unlocked | Yes | No |

| Part Number | 100-000001030 | 100-000001788 |

| Release Date | 2025-01-05 | 2026-01-04 |

The specifications show that the Ryzen 9 9955HX3D is built for maximum performance, with a higher TDP, more cores, more cache, and newer PCIe generation. The Ryzen AI 5 PRO 435 is built for efficiency, with a lower TDP, support for LPDDR5X memory, and a newer integrated graphics solution. The release dates are nearly a year apart, with the Ryzen 9 9955HX3D launching in January 2025 and the Ryzen AI 5 PRO 435 in January 2026. Both parts remain in active production.