AMD Ryzen 5 8640HS vs AMD Ryzen 7 7435HS Comparison

The AMD Ryzen 7 7435HS and AMD Ryzen 5 8640HS are two mobile processors that take very different approaches to performance. The Ryzen 7 7435HS is an 8-core, 16-thread part built on the older Zen 3+ architecture, while the Ryzen 5 8640HS is a 6-core, 12-thread chip using the newer Zen 4 design. Benchmark data shows the Ryzen 7 wins 12 of 15 head-to-head tests, but the Ryzen 5 takes a clear lead in single-threaded workloads. Both processors sit at the 78th percentile of all CPUs, making them comparable overall performers despite their architectural differences.

The Verdict

The data points to a clear split decision. The AMD Ryzen 7 7435HS is the pick for multi-threaded workloads and sustained productivity. It wins the Cinebench R23 multicore test by a massive 73% margin, scoring 19873 against the Ryzen 5’s 11486. Its advantage extends across most PassMark tests, including a 36.9% lead in data compression (310038 vs 226544) and a 37.6% lead in data encryption (18648 vs 13551). For users running video encoding, 3D rendering, or any heavily threaded application, the Ryzen 7’s two extra cores and four extra threads translate directly into faster completion times.

The AMD Ryzen 5 8640HS is the better choice when single-thread performance and power efficiency matter more. It wins the PassMark single-thread test with a score of 3584, which is 11.6% higher than the Ryzen 7’s 3167. It also wins the PassMark find prime numbers test by 22.9% (70 vs 54). The Ryzen 5 pairs this with a significantly lower TDP of 28 watts versus 45 watts for the Ryzen 7, making it more suitable for thinner, lighter laptops where battery life and thermal management are priorities. It also includes integrated Radeon 760M graphics, which the Ryzen 7 lacks entirely.

The average benchmark scores are close — 26402 for the Ryzen 7 and 26106 for the Ryzen 5 — but the distribution of wins is lopsided. The Ryzen 7 dominates in 12 of 15 tests, while the Ryzen 5 wins only 3. The Ryzen 7’s nearest rival is the AMD Ryzen 5 8640U with an average score of 26462 and a delta of -0.2%, while the Ryzen 5 8640HS sits near the Intel Core i7-14701TE at 26013 with a delta of 0.4%. These figures suggest the Ryzen 7 is marginally stronger on average, but the Ryzen 5 is no slouch in overall capability.

FAQ

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

A: The AMD Ryzen 7 7435HS is significantly faster. It scores 19873 in Cinebench R23 multicore, a 73% advantage over the Ryzen 5 8640HS’s 11486. It also leads in PassMark multithread with 23393 versus 19889, a 17.6% margin.

Q: Does the Ryzen 5 8640HS have any performance advantages?

A: Yes, in single-threaded tasks. The Ryzen 5 scores 3584 in PassMark single-thread, which is 11.6% higher than the Ryzen 7’s 3167. It also wins the PassMark find prime numbers test with 70 against 54.

Q: What are the architectural differences between these two chips?

A: The Ryzen 7 7435HS uses Zen 3+ architecture on a 6 nm process with a 210 mm² die, while the Ryzen 5 8640HS uses Zen 4 on a 4 nm process with a 178 mm² die and 25,000 million transistors. The Ryzen 5 has a newer architecture and process node.

Q: Which processor has better memory bandwidth?

A: The Ryzen 5 8640HS, with 89.6 GB/s compared to the Ryzen 7 7435HS’s 76.8 GB/s. Both support dual-channel DDR5 memory, but the Ryzen 5’s implementation is faster.

Q: Are these processors comparable in overall performance?

A: Yes. The Ryzen 7 7435HS has an average benchmark score of 26402, while the Ryzen 5 8640HS scores 26106, a difference of roughly 1.1%. Both rank at the 78th percentile of all CPUs.

Q: Does the Ryzen 5 8640HS include integrated graphics?

A: Yes, it features Radeon 760M integrated graphics. The Ryzen 7 7435HS has no integrated graphics listed in the data.

Architecture Differences

The two processors represent distinct generations of AMD mobile silicon. The Ryzen 7 7435HS is built on the Zen 3+ architecture with the codename Rembrandt-R, part of the 7000 series. It uses a 6 nm process node from TSMC and has a die size of 210 mm². The Ryzen 5 8640HS, in contrast, uses the newer Zen 4 architecture with the codename Hawk Point, belonging to the 8000 series. It is manufactured on a 4 nm process node and has a smaller die size of 178 mm², with 25,000 million transistors.

The cache structures differ notably between the two. Both have 64 KB of L1 cache per core and 16 MB of shared L3 cache, but the L2 cache differs: the Ryzen 7 has 512 KB per core, while the Ryzen 5 has 1 MB per core. This gives the Ryzen 5 a larger total L2 cache footprint despite having fewer cores. The Ryzen 5 also has a higher memory bandwidth at 89.6 GB/s compared to the Ryzen 7’s 76.8 GB/s, though both support dual-channel DDR5.

The Ryzen 5 8640HS includes Radeon 760M integrated graphics, while the Ryzen 7 7435HS has no integrated graphics listed. This is a significant feature difference for systems that rely on iGPU output. The Ryzen 5 also supports ECC memory (true), while the Ryzen 7 does not (false). Both processors use PCIe Gen 4 with 20 lanes (CPU only) and have locked multipliers.

Specification Differences

The core and thread counts are the most obvious difference: the Ryzen 7 7435HS has 8 cores and 16 threads, while the Ryzen 5 8640HS has 6 cores and 12 threads. Clock speeds favor the Ryzen 5, which has a base clock of 3.50 GHz and a boost clock of 4.90 GHz, compared to the Ryzen 7’s 3.10 GHz base and 4.50 GHz boost. The TDP also differs significantly, with the Ryzen 7 rated at 45 watts and the Ryzen 5 at 28 watts.

The sockets are different as well: the Ryzen 7 uses AMD Socket FP7, while the Ryzen 5 uses AMD Socket FP8. The Ryzen 5 has a release date of December 5, 2023, while no release date is listed for the Ryzen 7. The part numbers differ: the Ryzen 7 is 100-000001506, while the Ryzen 5 has multiple part numbers including 100-000001373 (FP7r2), 100-000001380 (FP7), and 100-000001358 (FP8).

Memory bandwidth is another differentiating factor, with the Ryzen 5 achieving 89.6 GB/s versus the Ryzen 7’s 76.8 GB/s. ECC memory support is present on the Ryzen 7 but absent on the Ryzen 5. The Ryzen 5 also has a larger L2 cache per core at 1 MB versus 512 KB on the Ryzen 7.

Head-to-Head Benchmarks

The Cinebench R23 multicore test is the biggest win for the Ryzen 7 7435HS, with a score of 19873 against the Ryzen 5’s 11486 — a 73% advantage. This is the largest delta in the entire benchmark suite and reflects the Ryzen 7’s core count advantage in heavily threaded workloads. The Cinebench R23 single-core test also goes to the Ryzen 7, scoring 2805 versus 1711, a 63.9% margin that is surprising given the Ryzen 5’s higher boost clock.

The Ryzen 7 continues its dominance in PassMark tests. It leads in data compression with 310038 versus 226544 (36.9% delta), data encryption with 18648 versus 13551 (37.6%), and extended instructions with 21690 versus 15855 (36.8%). The integer math test shows a 25.1% advantage (85274 vs 68173), while floating point math favors the Ryzen 7 by 23% (48863 vs 39725). PassMark multithread gives the Ryzen 7 a 17.6% lead (23393 vs 19889), and random string sorting goes to the Ryzen 7 by 16.5% (31827 vs 27316).

The Ryzen 5 8640HS wins the PassMark single-thread test decisively, scoring 3584 against the Ryzen 7’s 3167, an 11.6% delta. It also wins the find prime numbers test with 70 versus 54, a 22.9% margin. The Ryzen 5’s third win comes in the same single-thread test listed under the passmark_singlethread label, with identical scores. The Ryzen 7’s narrower wins include Cinebench R15 multicore (2003 vs 1845, 8.6% delta) and single-core (282 vs 268, 5.2% delta), plus PassMark physics (991 vs 970, 2.2% delta).

The data shows a clear pattern: the Ryzen 7 7435HS excels at multi-threaded and memory-intensive tasks, while the Ryzen 5 8640HS offers superior single-thread performance and lower power consumption. The Ryzen 7 wins 12 of 15 tests, but the Ryzen 5’s wins are in areas that matter for everyday responsiveness and battery efficiency.