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

The Verdict

The recorded data presents a complete victory for the AMD Ryzen 9 9955HX3D over the AMD Ryzen AI 5 435. Across all 15 head-to-head benchmark comparisons, the Ryzen 9 9955HX3D wins, with zero wins for the Ryzen AI 5 435. The average benchmark score difference is substantial: the Ryzen 9 9955HX3D posts an average score of 97453, while the Ryzen AI 5 435 averages 28128. This places the Ryzen 9 in the 96th percentile of all CPUs, versus the 80th percentile for the Ryzen AI 5.

The Ryzen 9 9955HX3D is the clear choice for workloads that demand maximum multi-threaded throughput, as its 16 cores and 32 threads deliver 258.4% higher Cinebench R15 multi-core scores and 236.7% higher Cinebench R23 multi-core scores. The Ryzen AI 5 435, with its 6 cores and 12 threads, is positioned for efficiency-focused mobile systems, evidenced by its 28W TDP and lower performance envelope. The data indicates that any user prioritizing raw compute power, especially in rendering, encryption, or physics simulations, should select the Ryzen 9 9955HX3D. For users where power consumption is the primary constraint, the Ryzen AI 5 435 offers a lower-power alternative, but the benchmark results show it cannot compete on performance.

Architecture Differences

Both processors are built on AMD's Zen 5 architecture and use a 4 nm TSMC process node, but they diverge significantly in their physical configuration and target segments. The Ryzen 9 9955HX3D, codenamed Fire Range, belongs to the 9000 series and is a 16-core, 32-thread part with a base clock of 2.50 GHz and a boost clock of 5.40 GHz. It uses the AMD Socket FL1 and has a TDP of 55W. In contrast, the Ryzen AI 5 435, codenamed Gorgon Point, belongs to the Ryzen AI 400 series and is a 6-core, 12-thread part with a base clock of 2.00 GHz and a boost clock of 4.50 GHz. It uses the AMD Socket FP8 and has a TDP of 28W.

The cache hierarchy is a major differentiator. The Ryzen 9 9955HX3D carries 128 MB of L3 cache, while the Ryzen AI 5 435 has only 4 MB of L3 cache. Both share the same per-core L1 (80 KB per core) and L2 (1 MB per core) allocations. The Ryzen 9 also has a larger transistor count, with 16,630 million transistors across a die size of 2x 70.6 mm², while the Ryzen AI 5 does not have recorded transistor or die size data. The Ryzen 9 supports DDR5 memory, while the Ryzen AI 5 supports both DDR5 and LPDDR5X. Both use dual-channel memory with the same 89.6 GB/s bandwidth. The Ryzen 9 uses PCIe Gen 5 with 28 lanes (CPU only), whereas the Ryzen AI 5 uses PCIe Gen 4 with 14 lanes. Integrated graphics differ as well: the Ryzen 9 uses a Radeon 610M, while the Ryzen AI 5 uses a Radeon 840M. The Ryzen 9 has an unlocked multiplier, the Ryzen AI 5 does not.

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 5 435 has 6 cores and 12 threads.

Q: How large is the L3 cache difference?

A: The Ryzen 9 9955HX3D has 128 MB of L3 cache, which is 32 times larger than the 4 MB L3 cache on the Ryzen AI 5 435.

Q: Which CPU has a higher boost clock?

A: The Ryzen 9 9955HX3D boosts up to 5.40 GHz, while the Ryzen AI 5 435 boosts up to 4.50 GHz.

Q: What are the TDP differences between the two?

A: The Ryzen 9 9955HX3D has a TDP of 55W, while the Ryzen AI 5 435 has a TDP of 28W.

Q: Do they use the same socket?

A: No. The Ryzen 9 9955HX3D uses AMD Socket FL1, and the Ryzen AI 5 435 uses AMD Socket FP8.

Q: What is the performance percentile ranking for each?

A: The Ryzen 9 9955HX3D ranks in the 96th percentile of all CPUs. The Ryzen AI 5 435 ranks in the 80th percentile.

Specification Differences

The following fields differ between the AMD Ryzen 9 9955HX3D and the AMD Ryzen AI 5 435:

• Cores: 16 vs 6
• Threads: 32 vs 12
• Base Clock: 2.50 GHz vs 2.00 GHz
• Boost Clock: 5.40 GHz vs 4.50 GHz
• TDP: 55W vs 28W
• Socket: AMD Socket FL1 vs AMD Socket FP8
• Codename: Fire Range vs Gorgon Point
• Generation: Ryzen 9 (Zen 5 (Fire Range)) vs Ryzen AI 400 (Zen 5 / Zen 5c)
• Transistors: 16,630 million vs null
• Die Size: 2x 70.6 mm² vs null
• L3 Cache: 128 MB vs 4 MB
• Memory Support: DDR5 vs DDR5, LPDDR5X
• PCIe: Gen 5, 28 Lanes (CPU only) vs Gen 4, 14 Lanes (CPU only)
• Integrated Graphics: Radeon 610M vs Radeon 840M
• Release Date: 2025-01-05 vs 2026-01-04
• Multiplier Unlocked: true vs false
• Part Number: 100-000001030 vs 100-000001337

Head-to-Head Benchmarks

The benchmark suite shows the Ryzen 9 9955HX3D dominating every recorded test. The largest margin is in the Passmark find prime numbers test, where the Ryzen 9 scores 525 versus 58 for the Ryzen AI 5, a delta of 805.2%. This test highlights the immense integer throughput available from the 16-core configuration.

In Cinebench R15 multi-core, the Ryzen 9 scores 6042.5 against 1686, a 258.4% advantage. The Cinebench R23 multi-core test shows a similar pattern, with 38161.5 versus 11333, a 236.7% delta. Single-core differences are smaller but still favor the Ryzen 9: Cinebench R15 single-core shows 332 versus 260 (27.7% higher), and Cinebench R23 single-core shows 2159.5 versus 1816 (18.9% higher).

The Passmark integer math test shows a 264.6% advantage (222503 versus 61026), and floating point math shows a 254.7% advantage (144122 versus 40627). Data compression results are 248.7% higher for the Ryzen 9 (785811 versus 225374), and data encryption is 255% higher (39446 versus 11110). Extended instructions, which can reflect SIMD and specialized workload performance, show a 287.8% delta (62813 versus 16197).

The multithreaded Passmark score is 229.9% higher for the Ryzen 9 (62674 versus 19000), and the physics test shows a 336% delta (4687 versus 1075). Random string sorting is 235.5% higher (83497 versus 24891). Single-thread performance, measured by both Passmark single_thread and singlethread tests, shows 4511 versus 3734, a 20.8% advantage for the Ryzen 9.

The data confirms that the Ryzen 9 9955HX3D is not just faster in multi-core scenarios; it also leads in every single-threaded test, albeit by smaller margins. The Ryzen AI 5 435, while efficient, cannot match any of these scores. The percentile rankings reflect this: the Ryzen 9 sits at 96th percentile, while the Ryzen AI 5 sits at 80th. The Ryzen 9's nearest rivals include the AMD Ryzen Threadripper PRO 5965WX, which is 1.1% higher in average score, and the AMD Ryzen 9 PRO 9945, which is 1.4% lower. The Ryzen AI 5's nearest rivals include the Intel Core i5-13490F, which is 0.2% lower, and the Intel Core i5-14500T, which is 0.2% higher. These close comparisons for the Ryzen AI 5 show it is competitive with mid-range desktop parts, but the Ryzen 9 operates in a different performance class entirely.