AMD Ryzen 5 7640U vs AMD Ryzen 7 6800H Comparison

FAQ

Q: Which processor has the higher single-thread performance?

A: The AMD Ryzen 5 7640U leads in every single-core benchmark recorded. It scores 255 versus 242.5 in Cinebench R15 single-core, 2532 versus 1542 in Cinebench R23 single-core, and 2127 versus 1761 in Geekbench single-core. The 7640U also wins PassMark single-thread with 3524 versus 3212.

Q: How do the two compare in multi-threaded workloads?

A: The results are split. The Ryzen 7 6800H wins Cinebench R15 multicore (2136 versus 1807) and Geekbench multicore (9642 versus 8595). However, the Ryzen 5 7640U wins Cinebench R23 multicore by a substantial margin, scoring 17936 versus 13094, a 37% advantage.

Q: Which CPU has more cores and threads?

A: The Ryzen 7 6800H has 8 cores and 16 threads. The Ryzen 5 7640U has 6 cores and 12 threads.

Q: What is the thermal design power difference?

A: The Ryzen 5 7640U has a TDP of 15 watts, while the Ryzen 7 6800H has a TDP of 45 watts.

Q: Does the Ryzen 5 7640U support ECC memory?

A: Yes, the Ryzen 5 7640U supports ECC memory. The Ryzen 7 6800H does not support ECC memory.

Q: How does the average benchmark score compare between the two?

A: The Ryzen 5 7640U has an average benchmark score of 25485, which places it in the 78th percentile of all CPUs. The Ryzen 7 6800H has an average benchmark score of 25201, placing it in the 77th percentile.

Architecture Differences

The two processors represent different architectural generations from AMD. The Ryzen 5 7640U belongs to the 7000 series and is built on the Zen 4 architecture with the codename Phoenix. The Ryzen 7 6800H belongs to the 6000 series and uses the Zen 3+ architecture with the codename Rembrandt. This generational gap explains several key differences in their design.

The manufacturing process differs notably. The Ryzen 5 7640U is fabricated on a 4 nm process at TSMC, while the Ryzen 7 6800H uses a 6 nm process, also from TSMC. The die size reflects this difference: the 7640U measures 178 mm², while the 6800H is larger at 208 mm². The 7640U contains 25,000 million transistors, a figure not recorded for the 6800H.

Core configuration is another major divergence. The Ryzen 5 7640U offers 6 cores and 12 threads, while the Ryzen 7 6800H offers 8 cores and 16 threads. Despite having fewer cores, the 7640U operates at higher clock speeds. Its base clock is 3.50 GHz with a boost clock of 4.90 GHz. The 6800H runs at 3.20 GHz base and 4.70 GHz boost.

Cache hierarchies also differ. Both processors share 16 MB of L3 cache and 64 KB of L1 cache per core. However, the L2 cache allocation differs: the 7640U provides 1 MB per core, while the 6800H provides 512 KB per core. This means the 7640U's L2 cache is twice as large per core.

Memory bandwidth favors the newer part. The 7640U supports DDR5 memory with a bandwidth of 89.6 GB/s, while the 6800H also supports DDR5 but at 76.8 GB/s. Both use a dual-channel memory bus. ECC memory support is present on the 7640U but absent on the 6800H.

The integrated graphics differ as well. The 7640U features the Radeon 760M, while the 6800H features the Radeon 680M. Both processors use AMD Socket FP8 and FP7 respectively, with Gen 4 PCIe and 20 lanes from the CPU. Neither processor has an unlocked multiplier.

Head-to-Head Benchmarks

The benchmark data reveals a complex performance picture. The Ryzen 5 7640U wins 8 of the 17 recorded head-to-head comparisons, while the Ryzen 7 6800H wins 9. The wins are distributed across different workload types, making a simple overall winner difficult to declare.

The Ryzen 5 7640U dominates in single-threaded tests. Its largest victory comes in Cinebench R23 single-core, where it scores 2532 against 1542, a 64.2% advantage. Geekbench single-core shows a 20.8% lead (2127 versus 1761). Cinebench R15 single-core gives a 5.2% edge (255 versus 242.5). PassMark single-thread and singlethread tests both show a 9.7% lead (3524 versus 3212).

The 7640U also wins in certain computationally intensive tests. PassMark find prime numbers shows a 29.8% advantage (74 versus 57). PassMark physics gives an 11.8% lead (1169 versus 1046). Most notably, Cinebench R23 multicore goes to the 7640U with 17936 versus 13094, a 37% margin despite the 6800H having two additional cores.

The Ryzen 7 6800H counters with strong multi-threaded performance in other tests. Its largest win is in PassMark data compression, scoring 293929 against 240032, an 18.3% advantage. PassMark data encryption shows an 18.1% lead (18260 versus 14954). PassMark integer math gives a 17.5% edge (85397 versus 70483). PassMark extended instructions shows a 15.4% lead (20114 versus 17019).

Geekbench multicore favors the 6800H with 9642 versus 8595, a 10.9% advantage. Cinebench R15 multicore goes to the 6800H at 2136 versus 1807, a 15.4% margin. PassMark floating point math shows a 14.4% lead (47989 versus 41093). PassMark multithread gives an 8.4% edge (23060 versus 21115). PassMark random string sorting shows a 4.2% lead (30668 versus 29382).

The average benchmark scores are very close. The 7640U averages 25485, while the 6800H averages 25201. The percentile rankings are similarly tight at 78 and 77 respectively. These figures suggest that despite the architectural differences, overall performance is comparable.

The Verdict

The data presents two clearly differentiated processors. The Ryzen 5 7640U is the choice for workloads that prioritize single-thread performance and efficiency. Its 64.2% lead in Cinebench R23 single-core and 37% lead in Cinebench R23 multicore are notable. The 15 watt TDP makes it suitable for power-constrained mobile designs, and ECC memory support adds value for certain professional use cases.

The Ryzen 7 6800H is the choice for multi-threaded workloads that scale with core count. Its 8 cores and 16 threads provide advantages in data compression, encryption, integer math, and Geekbench multicore. The 45 watt TDP indicates a design intended for higher sustained performance in larger chassis.

The nearly identical average benchmark scores, 25485 versus 25201, suggest that most users will see similar overall performance. The deciding factor should be workload type. Single-thread-heavy applications favor the 7640U, while parallel workloads that respond to the 6800H's additional cores favor the 6800H. The 7640U's 4 nm process and Zen 4 architecture deliver superior per-core efficiency, while the 6800H's larger core count compensates in throughput-oriented tasks.

Specification Differences

| Specification | AMD Ryzen 5 7640U | AMD Ryzen 7 6800H |

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

| Series | 7000 series | 6000 series |

| Cores | 6 | 8 |

| Threads | 12 | 16 |

| Base Clock | 3.50 GHz | 3.20 GHz |

| Boost Clock | 4.90 GHz | 4.70 GHz |

| TDP | 15 W | 45 W |

| Socket | AMD Socket FP8 | AMD Socket FP7 |

| Architecture | Zen 4 | Zen 3+ |

| Codename | Phoenix | Rembrandt |

| Process Node | 4 nm | 6 nm |

| Die Size | 178 mm² | 208 mm² |

| Transistors | 25,000 million | Not recorded |

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

| Memory Bandwidth | 89.6 GB/s | 76.8 GB/s |

| ECC Memory | Yes | No |

| Integrated Graphics | Radeon 760M | Radeon 680M |

| Release Date | 2023-05-02 | Not recorded |