AMD Ryzen 9 9955HX3D vs AMD Ryzen AI 5 430 Comparison

The Verdict

The AMD Ryzen 9 9955HX3D is a 16-core, 32-thread flagship mobile processor with a 5.40 GHz boost clock and 128 MB of L3 cache. The AMD Ryzen AI 5 430 is a 4-core, 8-thread mobile chip with a 4.50 GHz boost clock and only 4 MB of L3 cache. The data shows a complete dominance by the Ryzen 9 9955HX3D: it wins all 15 head-to-head benchmark comparisons with no wins for the Ryzen AI 5 430.

The Ryzen 9 9955HX3D sits at the 96th percentile of all CPUs in the database, while the Ryzen AI 5 430 sits at the 73rd percentile. The average benchmark score for the 9955HX3D is 97453, which places it 1.1% behind the AMD Ryzen Threadripper PRO 5965WX and 1.4% ahead of the AMD Ryzen 9 PRO 9945. The Ryzen AI 5 430 averages 19617, essentially tied with the AMD Ryzen 5 5500 at 0.1% ahead and 0.3% behind the Intel Core i5-12500.

Users who need maximum multi-threaded throughput, large cache capacity, and top-tier single-core performance should select the Ryzen 9 9955HX3D. Users who need a lower-power, more compact processor for lighter workloads should select the Ryzen AI 5 430, but they must accept significantly lower performance across every measured category. The 9955HX3D has a 55 W TDP and uses the AMD Socket FL1, while the Ryzen AI 5 430 has a 28 W TDP and uses the AMD Socket FP8.

Architecture Differences

The Ryzen 9 9955HX3D belongs to the 9000 series and uses the Zen 5 architecture with the Fire Range codename. The Ryzen AI 5 430 belongs to the Ryzen AI 400 generation and uses a Zen 5 / Zen 5c hybrid design with the Gorgon Point codename. Both processors use a 4 nm process node from TSMC. The Ryzen 9 9955HX3D has 16,630 million transistors on a die size of 2x 70.6 mm², while the Ryzen AI 5 430 has no recorded transistor count or die size in the database.

The core configurations differ sharply. The 9955HX3D offers 16 cores and 32 threads, while the Ryzen AI 5 430 offers 4 cores and 8 threads. Base clocks are 2.50 GHz for the 9955HX3D and 2.00 GHz for the Ryzen AI 5 430. Boost clocks are 5.40 GHz and 4.50 GHz respectively. The L1 cache is identical at 80 KB per core, and L2 cache is also identical at 1 MB per core. The L3 cache is the major architectural split: 128 MB on the 9955HX3D versus 4 MB on the Ryzen AI 5 430.

Both chips support DDR5 memory on a dual-channel bus with 89.6 GB/s bandwidth and both support ECC memory. The 9955HX3D uses PCIe Gen 5 with 28 lanes (CPU only), while the Ryzen AI 5 430 uses PCIe Gen 4 with 14 lanes (CPU only). The integrated graphics differ: the 9955HX3D carries a Radeon 610M, while the Ryzen AI 5 430 carries a Radeon 840M. The 9955HX3D has an unlocked multiplier and a part number of 100-000001030, while the Ryzen AI 5 430 has a locked multiplier and a part number of 100-000001787. The 9955HX3D was released on 2025-01-05, and the Ryzen AI 5 430 on 2026-01-04.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 9 9955HX3D has 16 cores and 32 threads. The AMD Ryzen AI 5 430 has 4 cores and 8 threads.

Q: How do the cache sizes compare?

A: The Ryzen 9 9955HX3D has 128 MB of L3 cache. The Ryzen AI 5 430 has 4 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 boost clock speeds?

A: The Ryzen 9 9955HX3D boosts to 5.40 GHz. The Ryzen AI 5 430 boosts to 4.50 GHz.

Q: Do both processors support ECC memory?

A: Yes, both the Ryzen 9 9955HX3D and the Ryzen AI 5 430 support ECC memory. Both support DDR5 on a dual-channel bus with 89.6 GB/s bandwidth. The Ryzen AI 5 430 also supports LPDDR5X.

Q: How do their average benchmark scores compare to their nearest rivals?

A: The Ryzen 9 9955HX3D has an average score of 97453, which is 1.1% behind the AMD Ryzen Threadripper PRO 5965WX and 1.4% ahead of the AMD Ryzen 9 PRO 9945. The Ryzen AI 5 430 has an average score of 19617, which is 0.1% ahead of the AMD Ryzen 5 5500 and 0.3% behind the Intel Core i5-12500.

Q: What sockets do these processors use?

A: The Ryzen 9 9955HX3D uses AMD Socket FL1. The Ryzen AI 5 430 uses AMD Socket FP8.

Specification Differences

| Specification | AMD Ryzen 9 9955HX3D | AMD Ryzen AI 5 430 |

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

| Cores | 16 | 4 |

| Threads | 32 | 8 |

| 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 |

| Architecture | Zen 5 | Zen 5 / Zen 5c |

| Codename | Fire Range | Gorgon Point |

| Generation | Ryzen 9 (Zen 5 (Fire Range)) | Ryzen AI 400 (Zen 5 / Zen 5c) |

| Process Node | 4 nm | 4 nm |

| 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 | Locked |

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

| Part Number | 100-000001030 | 100-000001787 |

The memory bus, bandwidth, L1 cache per core, L2 cache per core, ECC support, foundry, market segment, and production status are identical between the two. Both use TSMC as the foundry, both target the mobile market, and both are active production products.

Head-to-Head Benchmarks

The Ryzen 9 9955HX3D wins every single recorded benchmark comparison against the Ryzen AI 5 430. The smallest advantage appears in single-threaded tests, where the 9955HX3D leads by 20.2% in Cinebench R23 single-core (2159.5 versus 1797) and by 22.5% in Passmark single-thread (4511 versus 3683). The Cinebench R15 single-core result shows a 23.4% lead (332 versus 269). These margins reflect the higher 5.40 GHz boost clock and the larger cache hierarchy of the 9955HX3D, though the single-core gap is modest compared to the multi-threaded results.

Multi-threaded performance shows the full scale of the difference. In Cinebench R23 multi-core, the 9955HX3D scores 38161.5 against 8130 for the Ryzen AI 5 430, a 369.4% advantage. Cinebench R15 multi-core shows a 405.6% lead (6042.5 versus 1195). Passmark multithread gives the 9955HX3D a 370.5% win (62674 versus 13320). The Passmark physics test shows a 545.6% lead (4687 versus 726), and the Passmark find prime numbers test shows the largest single delta at 1093.2% (525 versus 44).

The remaining Passmark workloads all favor the 9955HX3D by large margins. Data compression shows a 394.5% lead (785811 versus 158912). Data encryption shows a 419.6% lead (39446 versus 7591). Extended instructions show a 448.3% lead (62813 versus 11455). Floating point math shows a 430% lead (144122 versus 27193). Integer math shows a 461.4% lead (222503 versus 39637). Random string sorting shows a 402.3% lead (83497 versus 16623). Every one of the 15 head-to-head tests records a win for the Ryzen 9 9955HX3D, with zero wins for the Ryzen AI 5 430.

Where Each One Wins

The Ryzen 9 9955HX3D wins in every benchmark category recorded in the database, so the use-case split is defined by the magnitude of its advantages rather than by any category where the Ryzen AI 5 430 takes the lead. The 9955HX3D is the clear choice for multi-threaded rendering, compilation, scientific computing, data compression, and encryption workloads, where its 16 cores, 32 threads, and 128 MB L3 cache produce leads of 369% to 1093% over the Ryzen AI 5 430. Its single-thread advantages of 20% to 23% also make it the better pick for lightly threaded applications, though the margin is far smaller than in multi-threaded tasks.

The Ryzen AI 5 430 has no benchmark wins, but its 28 W TDP and smaller footprint make it suitable for lower-power mobile systems where the 55 W TDP of the 9955HX3D is not desirable. It supports LPDDR5X memory in addition to DDR5, which the 9955HX3D does not, and it uses PCIe Gen 4 with 14 lanes instead of PCIe Gen 5 with 28 lanes. The Radeon 840M integrated graphics on the Ryzen AI 5 430 differ from the Radeon 610M on the 9955HX3D. The Ryzen AI 5 430 sits at the 73rd percentile with an average score of 19617, placing it alongside desktop parts like the AMD Ryzen 5 5500 and Intel Core i5-12500, while the 9955HX3D at the 96th percentile competes with workstation-class processors such as the AMD Ryzen Threadripper PRO 5965WX and AMD EPYC 4565P.

For users who prioritize raw performance in any measured workload, the data points exclusively to the Ryzen 9 9955HX3D. For users who prioritize lower power consumption, a smaller socket, and LPDDR5X memory support, the Ryzen AI 5 430 offers a functional but far less performant alternative. The benchmark record shows no scenario where the Ryzen AI 5 430 outperforms the Ryzen 9 9955HX3D.