AMD Ryzen 9 5900X vs AMD Ryzen 9 PRO 8945HS Comparison

The AMD Ryzen 9 PRO 8945HS and the AMD Ryzen 9 5900X present a stark contrast in design philosophy and performance priorities. The 8945HS, a mobile Zen 4 part, dominates in single-core and modern multi-core workloads, while the 5900X, a desktop Zen 3 part, leverages its additional cores to win the majority of raw throughput tests. The data shows a 10-to-5 split in benchmark wins favoring the 5900X, yet the magnitude of the 8945HS’s victories in key tests makes it the more compelling all-around performer for current-generation software.

Head-to-Head Benchmarks

The most decisive result is in Cinebench R23. The 8945HS scores 25,165 in multi-core, a 54.7% advantage over the 5900X’s 16,262. This is a massive margin for a mobile processor against a 12-core desktop part. The single-core gap is even more pronounced: the 8945HS scores 3,552 versus 1,527, a 132.6% delta. This suggests the Zen 4 architecture’s IPC and higher boost clock (5.20 GHz vs 4.80 GHz) provide a generational leap that core count alone cannot overcome. In Cinebench R15, the pattern flips slightly: the 5900X wins multi-core (2,695 vs 2,536, -5.9% for the 8945HS), but the 8945HS wins single-core (357 vs 250, +42.8%).

The 5900X’s victories are concentrated in PassMark suites that scale with core count. In data compression, it scores 499,968 versus 368,884, a 26.2% lead. Data encryption shows a 29.9% edge (31,106 vs 21,820). The largest single delta is in find prime numbers, where the 5900X scores 257 versus 91, a 64.6% advantage. This test likely rewards the 5900X’s 12 cores and 24 threads far more than the 8945HS’s 8 cores and 16 threads. Similarly, the 5900X leads in integer math (140,851 vs 103,390, +26.6%), floating-point math (77,700 vs 63,490, +18.3%), and extended instructions (33,119 vs 27,714, +16.3%).

However, the 8945HS reclaims ground in PassMark’s single-thread metric, scoring 3,920 versus 3,469, a 13% lead. This aligns with its Cinebench R23 single-core dominance. The multi-thread PassMark score favors the 5900X (39,002 vs 30,378, +22.1%), as does the physics test (1,994 vs 1,430, +28.3%) and random string sorting (51,646 vs 44,668, +13.5%). Notably, the 8945HS’s average benchmark score of 41,963 is slightly higher than the 5900X’s 41,376, despite losing more individual tests. This indicates that the 8945HS’s wins come in heavier-weight benchmarks that contribute more to the average.

Architecture Differences

The two processors are built on fundamentally different nodes and designs. The 8945HS uses a 4 nm TSMC process with 25,000 million transistors on a 178 mm² die. The 5900X uses a 7 nm TSMC process with 8,300 million transistors across two 74 mm² dies. This explains the 8945HS’s superior efficiency and single-core performance, as smaller transistors switch faster and consume less power.

Core and cache configurations diverge sharply. The 8945HS has 8 cores and 16 threads, with 1 MB of L2 per core and 16 MB of shared L3. The 5900X has 12 cores and 24 threads, with 512 KB of L2 per core and 64 MB of L3. The 5900X’s larger L3 is a classic desktop design for high-core-count throughput, while the 8945HS’s per-core L2 is larger (1 MB vs 512 KB), which benefits latency-sensitive single-threaded tasks. Both have 64 KB of L1 per core.

Memory and platform support are generationally distinct. The 8945HS supports DDR5 with dual-channel memory and a bandwidth of 89.6 GB/s. The 5900X supports DDR4 with dual-channel memory and 51.2 GB/s bandwidth. Both support ECC memory. The 8945HS uses AMD Socket FP7 and offers PCIe Gen 4 with 20 lanes (CPU only). The 5900X uses AMD Socket AM4 and offers PCIe Gen 4 without specifying lane count. The 8945HS includes integrated Radeon 780M graphics, while the 5900X has no integrated graphics.

Other differences: the 8945HS has a 45 W TDP, base clock of 4.00 GHz, and boost clock of 5.20 GHz. The 5900X has a 105 W TDP, base clock of 3.70 GHz, and boost clock of 4.80 GHz. The 8945HS is a mobile segment part, released in 2024, while the 5900X is a desktop part released in 2020. The 5900X has an unlocked multiplier; the 8945HS does not. The 5900X has a launch MSRP of $549.

The Verdict

Choose the AMD Ryzen 9 PRO 8945HS if your workloads prioritize single-core speed, modern multi-core scaling, and platform efficiency. Its Cinebench R23 multi-core score is 54.7% higher, and its single-core score is 132.6% higher. It also has a 13% lead in PassMark single-thread. It offers DDR5 memory bandwidth (89.6 GB/s) and integrated graphics, making it a self-contained mobile solution. The data strongly indicates this is the better processor for current-generation software that is not heavily threaded.

Choose the AMD Ryzen 9 5900X if your workloads are embarrassingly parallel and you need maximum core count for legacy or highly threaded applications. It wins 10 of 15 head-to-head benchmarks, including data compression (+26.2%), encryption (+29.9%), prime number finding (+64.6%), and integer math (+26.6%). Its 12 cores and 24 threads provide a raw throughput advantage that the 8945HS cannot match in these specific tests. It also has an unlocked multiplier for overclocking, which the 8945HS lacks.

The verdict is nuanced but clear: for general-purpose use, the 8945HS is the stronger chip due to its massive wins in Cinebench R23 and single-core tests. For server-style or scientific workloads that saturate all cores, the 5900X remains competitive. The 8945HS’s higher average benchmark score (41,963 vs 41,376) confirms its overall superiority despite losing more individual tests.

FAQ

Q: Which CPU is faster in Cinebench R23 multi-core?

A: The AMD Ryzen 9 PRO 8945HS is significantly faster, scoring 25,165 versus the 5900X’s 16,262, a 54.7% advantage.

Q: How large is the single-core performance gap?

A: The 8945HS leads by 132.6% in Cinebench R23 single-core (3,552 vs 1,527) and by 13% in PassMark single-thread (3,920 vs 3,469).

Q: Does the 5900X win any multi-core benchmarks?

A: Yes, it wins in Cinebench R15 multi-core (2,695 vs 2,536) and in multiple PassMark tests, including data compression (499,968 vs 368,884) and integer math (140,851 vs 103,390).

Q: What is the memory bandwidth difference?

A: The 8945HS supports DDR5 with 89.6 GB/s bandwidth, while the 5900X supports DDR4 with 51.2 GB/s bandwidth.

Q: Which processor has more cores and threads?

A: The 5900X has 12 cores and 24 threads, while the 8945HS has 8 cores and 16 threads.

Q: Does either CPU have integrated graphics?

A: Only the 8945HS has integrated graphics (Radeon 780M). The 5900X has no integrated graphics.

Where Each One Wins

The 8945HS wins in all single-threaded and modern multi-core rendering tests. Its Cinebench R23 results are exceptional: 25,165 multi-core and 3,552 single-core. It also takes PassMark single-thread (3,920). These wins suggest superiority in everyday desktop responsiveness, web browsing, office applications, and lightly threaded creative software like photo editing. The 5.20 GHz boost clock and Zen 4 architecture drive these results. Additionally, its DDR5 memory support (89.6 GB/s) gives it a bandwidth advantage for memory-sensitive tasks.

The 5900X wins in raw computational throughput across a broad range of PassMark workloads. Its largest win is in find prime numbers (257 vs 91, +64.6%), which is a pure core-count exercise. It also dominates in data compression (499,968 vs 368,884), data encryption (31,106 vs 21,820), and floating-point math (77,700 vs 63,490). These results indicate strength in video encoding, scientific simulation, and database operations that can utilize 12 cores and 24 threads. The 64 MB of L3 cache likely helps in large dataset workloads.

The 8945HS also wins in the aggregate average benchmark score (41,963 vs 41,376), suggesting it is more balanced. The 5900X’s wins are numerous but smaller in percentage terms, except for prime numbers, while the 8945HS’s wins in Cinebench are enormous. This means that for most users running mixed workloads, the 8945HS will feel faster, even though the 5900X excels in specific multi-threaded tasks.

Specification Differences

| Specification | AMD Ryzen 9 PRO 8945HS | AMD Ryzen 9 5900X |

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

| Cores | 8 | 12 |

| Threads | 16 | 24 |

| Base Clock | 4.00 GHz | 3.70 GHz |

| Boost Clock | 5.20 GHz | 4.80 GHz |

| TDP | 45 W | 105 W |

| Socket | AMD Socket FP7 | AMD Socket AM4 |

| Architecture | Zen 4 | Zen 3 |

| Process Node | 4 nm | 7 nm |

| Transistors | 25,000 million | 8,300 million |

| Die Size | 178 mm² | 2x 74 mm² |

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

| L3 Cache | 16 MB (shared) | 64 MB |

| Memory Support | DDR5 | DDR4 |

| Memory Bandwidth | 89.6 GB/s | 51.2 GB/s |

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

| Integrated Graphics | Radeon 780M | None |

| Market Segment | Mobile | Desktop |

| Release Date | 2024-04-15 | 2020-11-04 |

| Multiplier Unlocked | No | Yes |

| Part Number | 100-000001314 (FP7r2), 100-000001386 (FP7) | 100-000000061 |

The specification table highlights the generational shift: the 8945HS packs more transistors into a smaller node with lower power, while the 5900X relies on a larger, older process with more physical cores. The 8945HS’s higher clocks and DDR5 support compensate for its fewer cores in most modern benchmarks. The 5900X’s 64 MB L3 and unlocked multiplier remain its key advantages for overclocking and large-cache workloads.