AMD Ryzen 5 8540U vs AMD Ryzen 5 8640HS Comparison

The AMD Ryzen 5 8640HS is the clear performance winner over the AMD Ryzen 5 8540U, taking 11 of 15 head-to-head benchmark comparisons. However, the 8540U is not without merit, as it wins the single-threaded Cinebench R23 test and both PassMark single-thread workloads. For users prioritizing raw multi-threaded throughput in rendering or data-heavy tasks, the 8640HS is the definitive choice, while the 8540U offers marginal single-core advantages in specific legacy tests. Both chips share the same Zen 4 architecture, 6-core/12-thread configuration, and 28W TDP, but the 8640HS consistently delivers higher multi-threaded scores, making it the better pick for sustained workloads.

The Verdict

The data is unambiguous: the AMD Ryzen 5 8640HS is the stronger processor for almost all compute-intensive scenarios. Its average benchmark score of 26106 sits just 0.3% below the 8540U's 26187, but that overall figure masks the massive wins the 8640HS achieves in multi-threaded tasks. In Cinebench R23 multicore, the 8640HS scores 11486 versus 9721.5 for the 8540U — a 15.4% advantage. Similarly, in Cinebench R15 multicore, the 8640HS leads with 1845 against 1557.5, a 15.6% gap. These are not marginal differences; they represent a substantial performance tier separation.

The 8540U does win 4 of 15 benchmarks, but its victories are narrow and confined to specific workloads. It edges out the 8640HS in Cinebench R23 singlecore (1714.5 vs 1711, a 0.2% gain) and in PassMark single-thread (3639 vs 3584, a 1.5% gain). It also wins PassMark physics (1028 vs 970, a 6% gain). For buyers, the choice depends on whether those few single-core wins matter more than the 8640HS's commanding multi-threaded lead. The 8640HS is the pick for rendering, compilation, or any workload that scales across cores. The 8540U is only preferable if the specific single-thread tests it wins are critical, which is rarely the case in modern applications.

Architecture Differences

Both processors are built on the same fundamental design: AMD's Zen 4 architecture with the Hawk Point codename, produced on TSMC's 4nm process node. They share identical cache hierarchies — 64 KB L1 per core, 1 MB L2 per core, and 16 MB of shared L3 cache. Both support DDR5 memory in dual-channel mode with 89.6 GB/s bandwidth, and neither supports ECC memory. Both are unlocked-multiplier-free mobile parts with a 28W TDP.

The physical implementations differ significantly. The 8540U has a die size of 137 mm² and 20,900 million transistors, while the 8640HS is larger at 178 mm² with 25,000 million transistors. This suggests the 8640HS packs additional silicon, likely contributing to its higher performance envelope. The socket also differs: the 8540U uses AMD Socket FP7, while the 8640HS uses AMD Socket FP8. The PCIe lanes differ as well, with the 8540U providing Gen 4 with 14 lanes (CPU only) versus the 8640HS's Gen 4 with 20 lanes (CPU only). Integrated graphics also vary: the 8540U has a Radeon 740M, while the 8640HS steps up to a Radeon 760M. Both have a base clock difference — 3.20 GHz for the 8540U versus 3.50 GHz for the 8640HS — but identical 4.90 GHz boost clocks. The higher base clock on the 8640HS likely explains part of its multi-threaded advantage.

Head-to-Head Benchmarks

The most decisive gap appears in multi-threaded rendering tests. Cinebench R23 multicore shows the 8640HS at 11486, a 15.4% lead over the 8540U's 9721.5. Cinebench R15 multicore follows the same pattern, with the 8640HS at 1845 versus 1557.5, a 15.6% margin. PassMark integer math reinforces this trend: the 8640HS scores 68173 against 57755 for the 8540U, a 15.3% advantage. Floating-point math also favors the 8640HS, with 39725 versus 34958, a 12% lead.

The 8640HS also wins in memory-sensitive and encryption workloads. PassMark data compression shows 226544 for the 8640HS versus 208619 for the 8540U, a 7.9% gain. Data encryption delivers 13551 against 12245, a 9.6% margin. Random string sorting is another 8640HS win, with 27316 versus 24375, a 10.8% advantage. Extended instructions favor the 8640HS at 15855 versus 14900, a 6% lead. PassMark multithread gives the 8640HS 19889 versus 18332, a 7.8% edge, and find prime numbers is a narrow 70 versus 69 win for the 8640HS.

The 8540U's wins are smaller but notable. PassMark physics shows 1028 versus 970, a 6% advantage for the 8540U. PassMark single-thread delivers 3639 versus 3584, a 1.5% lead. Cinebench R23 singlecore is a razor-thin 1714.5 versus 1711, a 0.2% margin. Cinebench R15 singlecore also goes to the 8640HS at 268 versus 253, a 5.6% difference, so the 8540U's single-core prowess is inconsistent across tests.

FAQ

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

A: The AMD Ryzen 5 8640HS dominates multi-core benchmarks. In Cinebench R23 multicore, it scores 11486 versus 9721.5 for the 8540U, a 15.4% advantage. PassMark multithread also favors the 8640HS at 19889 versus 18332, a 7.8% lead.

Q: Is the 8540U better in any significant workload?

A: Yes, in a few narrow cases. The 8540U wins PassMark physics with a 6% margin (1028 vs 970) and PassMark single-thread by 1.5% (3639 vs 3584). It also edges out the 8640HS in Cinebench R23 singlecore by 0.2% (1714.5 vs 1711).

Q: Do both processors have the same number of cores and threads?

A: Yes, both have 6 cores and 12 threads. They also share the same 16 MB of shared L3 cache and 1 MB L2 per core.

Q: Are there differences in integrated graphics?

A: Yes. The 8540U comes with a Radeon 740M, while the 8640HS features a Radeon 760M. The 8640HS also has a larger die size (178 mm² vs 137 mm²) and more transistors (25,000 million vs 20,900 million).

Q: How do their average benchmark scores compare?

A: They are nearly identical. The 8540U has an average benchmark score of 26187, while the 8640HS scores 26106. The 8540U is 0.3% ahead of the 8640HS in average score, but this aggregate hides the 8640HS's much stronger multi-threaded results.

Q: Which processor has a higher base clock?

A: The 8640HS has a base clock of 3.50 GHz, while the 8540U runs at 3.20 GHz. Both boost to 4.90 GHz.

Where Each One Wins

The AMD Ryzen 5 8640HS is the clear winner for multi-threaded, compute-heavy applications. Its 15.4% lead in Cinebench R23 multicore and 15.3% lead in PassMark integer math make it the superior choice for video rendering, 3D modeling, code compilation, and scientific simulations. The 8640HS also wins in data compression (7.9% faster), encryption (9.6% faster), and random string sorting (10.8% faster), making it better for database workloads, file archiving, and any task involving large data manipulation. Floating-point math, a proxy for scientific and engineering calculations, also favors the 8640HS by 12%.

The AMD Ryzen 5 8540U wins in specific legacy or single-threaded scenarios. Its PassMark physics score of 1028 versus 970 (6% higher) suggests better performance in older physics-based simulations. Its PassMark single-thread score of 3639 versus 3584 (1.5% higher) and Cinebench R23 singlecore score of 1714.5 versus 1711 (0.2% higher) indicate marginal advantages in lightly-threaded applications. However, these wins are narrow and inconsistent — the 8640HS actually wins Cinebench R15 singlecore by 5.6% — so the 8540U's single-core edge is not reliable across all tests. For most users, the 8640HS is the better all-around processor, with the 8540U only appealing to those who specifically need its physics or particular single-thread results.

Specification Differences

| Specification | AMD Ryzen 5 8540U | AMD Ryzen 5 8640HS |

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

| Base Clock | 3.20 GHz | 3.50 GHz |

| Boost Clock | 4.90 GHz | 4.90 GHz |

| Socket | AMD Socket FP7 | AMD Socket FP8 |

| Transistors | 20,900 million | 25,000 million |

| Die Size | 137 mm² | 178 mm² |

| PCIe | Gen 4, 14 Lanes (CPU only) | Gen 4, 20 Lanes (CPU only) |

| Integrated Graphics | Radeon 740M | Radeon 760M |

| Part Number | 100-000001326 (FP7r2), 100-000001333 (FP7) | 100-000001373 (FP7r2), 100-000001380 (FP7), 100-000001358 (FP8) |

Both processors share identical specifications in several areas: 6 cores, 12 threads, 28W TDP, Zen 4 architecture, Hawk Point codename, 4nm process from TSMC, 64 KB L1 per core, 1 MB L2 per core, 16 MB shared L3, DDR5 memory support, dual-channel memory bus, 89.6 GB/s memory bandwidth, no ECC support, mobile market segment, active production status, and a release date of 2023-12-05. Neither has a launch MSRP listed, and both are locked multipliers.