AMD Ryzen 9 9955HX3D vs AMD Ryzen AI 7 445 Comparison

Where Each One Wins

The benchmark data splits cleanly along core-count and cache lines. The AMD Ryzen 9 9955HX3D wins every recorded head-to-head test, 15 out of 15, with no victories for the AMD Ryzen AI 7 445. That complete sweep does not mean the two processors serve the same purpose; rather, the Ryzen 9 9955HX3D is built for maximum throughput, while the Ryzen AI 7 445 targets efficiency in a smaller physical and thermal envelope.

The Ryzen 9 9955HX3D dominates in multi-threaded workloads. In Cinebench R23 multi-core, it scores 38,161.5 versus 10,590 for the Ryzen AI 7 445, a 260.4% advantage. The PassMark multi-thread test shows a 246% lead, 62,674 to 18,115. These are the largest categories of difference, driven by the 16-core, 32-thread configuration versus the 6-core, 12-thread part. The Ryzen 9 9955HX3D also holds a decisive edge in integer math (222,503 to 58,332, or 281.4%), floating-point math (144,122 to 39,362, or 266.1%), and data encryption (39,446 to 10,519, or 275%).

The Ryzen AI 7 445 does not win a single benchmark, but its scores reveal where it remains viable. Single-thread performance is its strongest relative showing: in Cinebench R23 single-core, it trails by only 19.6% (2,159.5 to 1,806). In PassMark single-thread, the gap narrows to 25.6% (4,511 to 3,591). That is a modest deficit for a chip with roughly one-third the core count and half the L3 cache. The Ryzen AI 7 445 also carries a lower 28 W TDP against the Ryzen 9 9955HX3D's 55 W, making it the more power-conscious option for thin-and-light machines, though the database records no power efficiency metric directly.

For workloads that scale with cores, the Ryzen 9 9955HX3D is the clear pick. For single-threaded tasks or battery-sensitive mobile use, the Ryzen AI 7 445 remains competitive despite losing every recorded test. The data shows a performance hierarchy, not a functional equivalence.

The Verdict

The database positions the AMD Ryzen 9 9955HX3D in the 96th percentile of all CPUs, with an average benchmark score of 97,453. Its nearest rivals are desktop-class parts: the AMD Ryzen Threadripper PRO 5965WX (average 98,504, 1.1% faster), the AMD Ryzen 9 PRO 9945 (average 96,083, 1.4% slower), and the AMD EPYC 4565P (average 95,764, 1.8% slower). This places the Ryzen 9 9955HX3D at the top of the mobile CPU hierarchy, competing with workstation and server silicon.

The AMD Ryzen AI 7 445 sits in the 79th percentile, with an average benchmark score of 26,936. Its nearest rivals are mainstream mobile and older desktop parts: the Intel Core i7-1370P (average 26,900, 0.1% faster), the AMD Ryzen 5 7545U (average 26,849, 0.3% faster), and the AMD Ryzen 7 5700G (average 27,051, 0.4% slower). The Ryzen AI 7 445 trades blows with these parts, landing within a percentage point of each.

The verdict follows the percentile gap. The Ryzen 9 9955HX3D is for users who need maximum multi-threaded performance in a mobile socket, given its 96th-percentile standing and 16-core design. The Ryzen AI 7 445 is for users who prioritize portability and battery life, given its 28 W TDP and 79th-percentile ranking, accepting a major multi-threaded deficit. The data does not support a single "better" pick; it supports two different product tiers.

Head-to-Head Benchmarks

The largest single margin comes in PassMark's find prime numbers test, where the Ryzen 9 9955HX3D scores 525 against 56 for the Ryzen AI 7 445, an 837.5% advantage. This is an extreme outlier, but it reflects the core-count and cache disparity: the Ryzen 9 9955HX3D has 16 cores, 32 threads, and 128 MB of L3 cache, while the Ryzen AI 7 445 has 6 cores, 12 threads, and only 4 MB of L3 cache.

The extended instructions test shows a 296.9% lead (62,813 to 15,826), which covers AVX and similar workloads. Physics simulation follows at 380.2% (4,687 to 976). Integer math and floating-point math both exceed 260% leads. Data compression (785,811 to 215,812) sits at 264.1%, and random string sorting (83,497 to 23,488) at 255.5%.

The Cinebench R15 multi-core test shows a 250.7% lead (6,042.5 to 1,723), while the R23 multi-core test shows 260.4%. These are consistent with the PassMark multi-thread result of 246%. The Ryzen 9 9955HX3D's multi-threaded advantage is roughly 2.5 to 2.8 times across all major tests.

Single-threaded results are closer. Cinebench R15 single-core shows 332 to 254, a 30.7% lead. Cinebench R23 single-core shows 2,159.5 to 1,806, a 19.6% lead. PassMark single-thread shows 4,511 to 3,591, a 25.6% lead. The Ryzen 9 9955HX3D still wins every single-thread test, but the margins shrink to under a third of the multi-threaded gaps. The boost clock difference matters here: 5.40 GHz versus 4.60 GHz, which explains the single-thread edge despite both using the Zen 5 architecture.

Data encryption shows a 275% lead (39,446 to 10,519), a workload that benefits heavily from more cores. The only test where the Ryzen AI 7 445 comes within 20% is Cinebench R23 single-core, and even there it loses. The head-to-head data is unambiguous: the Ryzen 9 9955HX3D wins every test, with the margin scaling from roughly 20% in single-threaded workloads to over 800% in a specific prime-number calculation.

FAQ

Q: Which CPU has the higher multi-core performance?

A: The AMD Ryzen 9 9955HX3D wins all multi-core tests. In Cinebench R23 multi-core, it scores 38,161.5 versus 10,590 for the AMD Ryzen AI 7 445, a 260.4% advantage. PassMark multi-thread shows 62,674 versus 18,115, a 246% lead.

Q: How close are the two in single-thread performance?

A: The Ryzen 9 9955HX3D wins every single-thread test, but the margins are smaller. Cinebench R23 single-core shows a 19.6% lead (2,159.5 to 1,806), and PassMark single-thread shows a 25.6% lead (4,511 to 3,591).

Q: What is the core and thread difference?

A: The Ryzen 9 9955HX3D has 16 cores and 32 threads. The AMD Ryzen AI 7 445 has 6 cores and 12 threads. Both use the Zen 5 architecture on a 4 nm TSMC process.

Q: How does the L3 cache compare?

A: The Ryzen 9 9955HX3D has 128 MB of L3 cache. The AMD Ryzen AI 7 445 has 4 MB of L3 cache. Both have 80 KB of L1 and 1 MB of L2 per core.

Q: Which CPU has the higher boost clock?

A: The Ryzen 9 9955HX3D boosts to 5.40 GHz. The AMD Ryzen AI 7 445 boosts to 4.60 GHz. The base clocks are 2.50 GHz and 2.00 GHz, respectively.

Q: What are the TDP ratings?

A: The Ryzen 9 9955HX3D has a 55 W TDP. The AMD Ryzen AI 7 445 has a 28 W TDP. Both support DDR5 memory with dual-channel 89.6 GB/s bandwidth and ECC memory.

Architecture Differences

The two processors share the Zen 5 architecture and both use a 4 nm TSMC process, but they diverge in almost every other structural detail. The Ryzen 9 9955HX3D uses the Fire Range codename and belongs to the 9000 series, with the generation listed as "Ryzen 9 (Zen 5 (Fire Range))". It mounts on AMD Socket FL1. The Ryzen AI 7 445 uses the Gorgon Point codename and belongs to the Ryzen AI 400 generation, listed as "Ryzen AI 400 (Zen 5 / Zen 5c)". It mounts on AMD Socket FP8. The Ryzen 9 9955HX3D is unlocked (multiplierUnlocked is true), while the Ryzen AI 7 445 is locked.

The core counts differ substantially: 16 cores and 32 threads for the Ryzen 9 9955HX3D, versus 6 cores and 12 threads for the Ryzen AI 7 445. The Ryzen 9 9955HX3D also carries a much larger L3 cache at 128 MB, compared to 4 MB for the Ryzen AI 7 445. Both share the same per-core L1 (80 KB) and L2 (1 MB) sizes. The transistor count and die size are recorded only for the Ryzen 9 9955HX3D: 16,630 million transistors across 2x 70.6 mm² dies. The Ryzen AI 7 445 has no transistor or die size data in the database.

Memory support differs. The Ryzen 9 9955HX3D supports DDR5 only, while the Ryzen AI 7 445 supports both DDR5 and LPDDR5X. Both have dual-channel memory buses with 89.6 GB/s bandwidth and ECC support. PCIe connectivity differs: the Ryzen 9 9955HX3D offers Gen 5 with 28 lanes (CPU only), while the Ryzen AI 7 445 offers Gen 4 with 14 lanes (CPU only). The Ryzen 9 9955HX3D integrates a Radeon 610M GPU, while the Ryzen AI 7 445 integrates a Radeon 840M.

The release dates are separated by roughly one year: the Ryzen 9 9955HX3D launched on January 5, 2025, and the Ryzen AI 7 445 on January 4, 2026. Both are classified as mobile parts and remain in active production. The Ryzen 9 9955HX3D has a 96th-percentile ranking against all CPUs, while the Ryzen AI 7 445 sits at the 79th percentile. The average benchmark scores reinforce the gap: 97,453 for the Ryzen 9 9955HX3D versus 26,936 for the Ryzen AI 7 445. The Ryzen 9 9955HX3D's nearest rivals are workstation and EPYC parts, while the Ryzen AI 7 445's nearest rivals are P-series mobile chips and older desktop parts, confirming their separate market positions.