AMD Ryzen 9 PRO 5945 vs AMD Ryzen AI 9 HX 375 Comparison

Where Each One Wins

The AMD Ryzen AI 9 HX 375 and the AMD Ryzen 9 PRO 5945 split their benchmark wins almost evenly, with the desktop part taking 8 wins and the mobile part taking 7. The split is not random; it follows a clear pattern tied to workload type.

The Ryzen 9 PRO 5945 dominates in heavy multi-threaded rendering and security-related tasks. Its largest margins come in Cinebench R23 multi-core (25.7% ahead), Cinebench R15 single-core (27.8% ahead), and Cinebench R23 single-core (52% ahead). It also wins in data encryption (20.9% ahead), prime number finding (46.5% ahead), and integer math (6.2% ahead). These are workloads that benefit from higher sustained clock speeds and a mature, high-frequency design.

The Ryzen AI 9 HX 375 takes the lead in single-threaded PassMark tests (10.5% ahead), extended instruction handling (8.3% ahead), floating-point math (6.9% ahead), physics simulation (2.7% ahead), and random string sorting (2.5% ahead). It also wins Cinebench R15 multi-core by 12.7%. These wins cluster around modern instruction efficiency and memory-level parallelism rather than raw clock speed.

For users deciding based on workload: the Ryzen 9 PRO 5945 is the choice for Cinebench-style rendering, encryption, and integer-heavy number crunching. The Ryzen AI 9 HX 375 is the choice for floating-point workloads, extended instruction sets, and single-threaded PassMark performance. The overall average benchmark score favors the Ryzen 9 PRO 5945 (47527 versus 46030), a 3.1% gap, but the per-test distribution shows that neither part is universally faster.

Architecture Differences

The two processors come from different generations and design philosophies. The Ryzen AI 9 HX 375 uses the Zen 5 architecture on a 4 nm TSMC process, with the Strix Point codename and a die size of 233 mm². It is part of the Ryzen AI 300 generation, which combines Zen 5 and Zen 5c cores. The Ryzen 9 PRO 5945 uses the older Zen 3 architecture on a 7 nm TSMC process, with the Vermeer codename and a dual-die design totaling 2x 74 mm², or 148 mm² combined. The Ryzen 9 PRO 5945 has 8,300 million transistors; the Ryzen AI 9 HX 375 does not have a recorded transistor count.

Both parts have 12 cores and 24 threads, so thread count is identical. The difference lies in clock strategy and cache structure. The Ryzen AI 9 HX 375 runs a base clock of 2.00 GHz and boosts to 5.10 GHz, with a 28 W TDP. The Ryzen 9 PRO 5945 runs a higher base clock of 3.00 GHz but a lower boost of 4.70 GHz, with a 65 W TDP. The higher boost clock on the mobile part explains its single-threaded PassMark win, while the higher base clock and larger power budget on the desktop part sustain its multi-core rendering lead.

Cache is a major differentiator. The Ryzen AI 9 HX 375 has 80 KB of L1 per core, 1 MB of L2 per core, and 16 MB of L3. The Ryzen 9 PRO 5945 has 64 KB of L1 per core, 512 KB of L2 per core, and 64 MB of L3. The desktop part has four times the L3 cache, which helps in workloads that repeatedly access large data sets, such as encryption and prime number generation. The mobile part has larger per-core L1 and L2, which helps in latency-sensitive single-threaded tasks.

Memory support also differs. The Ryzen AI 9 HX 375 supports DDR5 and LPDDR5X with dual-channel memory and 89.6 GB/s bandwidth. The Ryzen 9 PRO 5945 supports DDR4 with dual-channel memory and 51.2 GB/s bandwidth. The mobile part has 75% more memory bandwidth, yet the desktop part still wins most memory-intensive benchmarks. This suggests the desktop part's higher clocks and larger L3 compensate for its narrower memory pipe.

The Ryzen AI 9 HX 375 includes integrated Radeon 890M graphics and uses AMD Socket FP8. The Ryzen 9 PRO 5945 has no integrated graphics and uses AMD Socket AM4. The mobile part has 16 PCIe Gen 4 lanes (CPU only), while the desktop part has 20 PCIe Gen 4 lanes (CPU only). The Ryzen 9 PRO 5945 supports ECC memory; the Ryzen AI 9 HX 375 does not.

Head-to-Head Benchmarks

The largest single win belongs to the Ryzen 9 PRO 5945 in Cinebench R23 single-core, where it scores 4145 against 1988, a 52% lead. This is a decisive gap that no other benchmark approaches. The Ryzen 9 PRO 5945 also leads Cinebench R15 single-core by 27.8% (417 versus 301) and Cinebench R23 multi-core by 25.7% (29366 versus 21812). These three Cinebench results show a consistent pattern: the desktop part is substantially faster in rendering workloads, both single and multi-threaded.

The Ryzen 9 PRO 5945 also wins PassMark data encryption by 20.9% (26313 versus 20802) and PassMark find prime numbers by 46.5% (228 versus 122). The prime number test is the second-largest margin in the comparison. Integer math goes to the desktop part by 6.2% (129768 versus 121754), and PassMark multithread goes to it by 4.7% (34549 versus 32916). Data compression is close, with the desktop part ahead by only 2.8% (416599 versus 404918).

The Ryzen AI 9 HX 375 takes its largest win in Cinebench R15 multi-core, scoring 3334 against 2959, a 12.7% lead. This is noteworthy because the desktop part wins the newer Cinebench R23 multi-core test by a wide margin, yet the older R15 test favors the mobile part. The mobile part also wins PassMark single-thread by 10.5% (3867 versus 3499), a consistent result across both the single_thread and singlethread entries. Extended instructions go to the mobile part by 8.3% (29269 versus 27031), and floating-point math by 6.9% (75153 versus 70291). Physics and random string sorting are narrow wins for the mobile part, at 2.7% and 2.5% respectively.

The overall average benchmark score favors the Ryzen 9 PRO 5945 at 47527 against 46030, a 3.1% difference. The percentile ranks are close: the Ryzen 9 PRO 5945 sits at the 90th percentile of all CPUs, while the Ryzen AI 9 HX 375 sits at the 89th. The nearest rivals for the mobile part include the Intel Core Ultra 5 235 (delta -0.1%), AMD EPYC 4364P (delta +0.1%), Intel Core i9-13900HX (delta -0.1%), and AMD EPYC 7303 (delta +0.2%). The nearest rivals for the desktop part include the Intel Core Ultra X9 378H (delta +0.1%), Intel Core Ultra 7 265T (delta -0.4%), Intel Core i7-13700KF (delta +0.4%), and Intel Core i9-12900F (delta +0.7%).

FAQ

Q: Which processor is faster in single-core workloads?

A: It depends on the benchmark. The Ryzen 9 PRO 5945 wins Cinebench R15 single-core by 27.8% and Cinebench R23 single-core by 52%. The Ryzen AI 9 HX 375 wins PassMark single-thread by 10.5%. The Cinebench results favor the desktop part by large margins, while the PassMark test favors the mobile part.

Q: How do the two compare in multi-core rendering?

A: The Ryzen 9 PRO 5945 wins Cinebench R23 multi-core by 25.7% (29366 versus 21812). However, the Ryzen AI 9 HX 375 wins Cinebench R15 multi-core by 12.7% (3334 versus 2959). The newer R23 test favors the desktop part decisively.

Q: Which processor has more cache?

A: The Ryzen 9 PRO 5945 has 64 MB of L3 cache, while the Ryzen AI 9 HX 375 has 16 MB. The desktop part also has 512 KB of L2 per core versus 1 MB per core on the mobile part, and 64 KB of L1 per core versus 80 KB per core on the mobile part.

Q: Do both processors have the same core and thread counts?

A: Yes, both have 12 cores and 24 threads. The difference is in architecture (Zen 5 versus Zen 3), process node (4 nm versus 7 nm), clock speeds, and cache layout.

Q: Which processor supports ECC memory?

A: Only the Ryzen 9 PRO 5945 supports ECC memory. The Ryzen AI 9 HX 375 does not. The desktop part also uses DDR4, while the mobile part uses DDR5 and LPDDR5X.

Q: What is the average benchmark score difference?

A: The Ryzen 9 PRO 5945 has an average benchmark score of 47527, while the Ryzen AI 9 HX 375 has 46030. The desktop part is ahead by 3.1%. Both sit near the 90th percentile of all CPUs, with the desktop part at 90 and the mobile part at 89.

Specification Differences

| Specification | AMD Ryzen AI 9 HX 375 | AMD Ryzen 9 PRO 5945 |

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

| Architecture | Zen 5 | Zen 3 |

| Codename | Strix Point | Vermeer |

| Process node | 4 nm | 7 nm |

| Die size | 233 mm² | 2x 74 mm² |

| Transistors | Not recorded | 8,300 million |

| Base clock | 2.00 GHz | 3.00 GHz |

| Boost clock | 5.10 GHz | 4.70 GHz |

| TDP | 28 W | 65 W |

| Socket | AMD Socket FP8 | AMD Socket AM4 |

| L1 cache | 80 KB (per core) | 64 KB (per core) |

| L2 cache | 1 MB (per core) | 512 KB (per core) |

| L3 cache | 16 MB | 64 MB |

| Memory support | DDR5, LPDDR5X | DDR4 |

| Memory bandwidth | 89.6 GB/s | 51.2 GB/s |

| ECC memory | No | Yes |

| PCIe lanes | Gen 4, 16 Lanes (CPU only) | Gen 4, 20 Lanes (CPU only) |

| Integrated graphics | Radeon 890M | None |

| Market segment | Mobile | Desktop |

| Release date | 2024-06-30 | 2022-04-03 |

The Verdict

The data points to two distinct usage profiles. The AMD Ryzen 9 PRO 5945 is the stronger choice for Cinebench rendering, encryption, prime number calculations, and integer math. Its 52% lead in Cinebench R23 single-core and 25.7% lead in Cinebench R23 multi-core are the largest margins in this comparison. The 64 MB L3 cache and 65 W TDP support sustained multi-threaded work. Users who prioritize ECC memory support or need a desktop AM4 platform should also favor this part.

The AMD Ryzen AI 9 HX 375 is the better choice for floating-point math, extended instruction workloads, physics simulation, and PassMark single-threaded performance. It wins those tests by margins ranging from 2.5% to 10.5%. Its 5.10 GHz boost clock and larger per-core L1 and L2 caches give it an edge in latency-sensitive tasks. The integrated Radeon 890M graphics and 28 W TDP make it suitable for mobile systems where a discrete GPU is not required.

The overall average benchmark score favors the Ryzen 9 PRO 5945 (47527 versus 46030), and its 90th percentile rank is one point higher than the mobile part's 89th. However, the mobile part wins 7 of 15 head-to-head tests, so the desktop part's overall lead comes from the magnitude of its larger wins rather than the number of wins. Neither processor is universally superior. The choice depends on whether the workload leans toward rendering and encryption (Ryzen 9 PRO 5945) or floating-point and single-threaded responsiveness (Ryzen AI 9 HX 375).