AMD Ryzen 5 PRO 8640HS vs AMD Ryzen 7 7735U Comparison

The AMD Ryzen 5 PRO 8640HS and AMD Ryzen 7 7735U are both 28 W mobile processors aimed at thin-and-light laptops, yet they deliver distinctly different performance profiles. The data shows a clear split: the Ryzen 5 PRO 8640HS dominates synthetic rendering workloads, while the Ryzen 7 7735U fights back in specific data-processing tasks. Both chips occupy the 80th percentile among all CPUs, with average benchmark scores of 28478 and 28350 respectively, placing them within 0.5% of each other overall.

Head-to-Head Benchmarks

The most dramatic divergence appears in Cinebench R23. The Ryzen 5 PRO 8640HS scores 18104 in multi-core, a staggering 79.5% ahead of the Ryzen 7 7735U’s 10085. This is not a marginal difference; it indicates a fundamental advantage in sustained multi-threaded rendering. The single-core R23 results reinforce this trend, with the 8640HS posting 2555 against 1490, a 71.5% lead. Cinebench R15 shows a smaller but still meaningful gap: 1824 vs 1698 (7.4%) in multi-core and 257 vs 234 (9.8%) in single-core.

The Ryzen 5 PRO 8640HS also wins in several PassMark subtests. Extended instructions show a 13.2% advantage (18507 vs 16349), random string sorting is 14.7% higher (30235 vs 26365), and find prime numbers comes in at 71 vs 57, a 24.6% lead. Single-thread performance, as measured by PassMark, favors the 8640HS by exactly 10% (3561 vs 3236). The multi-thread PassMark score goes to the 8640HS as well, 21465 vs 20723, a 3.6% edge. Floating point math is essentially a tie, with the 8640HS ahead by a razor-thin 0.1% (43019 vs 42966). Physics simulation also favors the 8640HS, 1043 vs 996, a 4.7% difference.

However, the Ryzen 7 7735U is not without its victories. It wins PassMark integer math decisively, scoring 79580 against the 8640HS’s 69839 — a 12.2% advantage. Data compression goes to the 7735U by 1.6% (250457 vs 246446), and data encryption shows a 5.5% lead (15825 vs 14962). Across the 15 head-to-head benchmarks, the Ryzen 5 PRO 8640HS wins 12, while the Ryzen 7 7735U takes 3. The overall picture is one of a newer architecture delivering superior single-thread and rendering performance, while the older chip leverages its extra cores for integer-heavy workloads.

Architecture Differences

The Ryzen 5 PRO 8640HS is built on the Zen 4 architecture, codenamed Hawk Point, and belongs to the 8000 series. It uses a 4 nm process node from TSMC, with a die size of 178 mm² and 25,000 million transistors. In contrast, the Ryzen 7 7735U uses the Zen 3+ architecture, codenamed Rembrandt-R, from the 7000 series. It is fabricated on TSMC’s 6 nm node, with a larger die size of 208 mm²; transistor count is not provided in the data.

Core configurations differ significantly. The 8640HS has 6 cores and 12 threads, while the 7735U has 8 cores and 16 threads. This gives the 7735U a theoretical multi-threading advantage, yet the benchmark results show the opposite in most tests, underscoring the IPC gains of Zen 4. Cache layouts also diverge: both share 64 KB of L1 per core and 16 MB of shared L3, but the L2 cache differs. The 8640HS offers 1 MB per core, while the 7735U provides only 512 KB per core. This doubling of L2 likely contributes to the 8640HS’s strong performance in latency-sensitive workloads.

Clock speeds tell a similar story. The 8640HS has a base clock of 3.50 GHz and a boost clock of 4.90 GHz. The 7735U starts lower at 2.70 GHz base and boosts to 4.75 GHz. Both processors support dual-channel DDR5 memory and ECC, but memory bandwidth differs: the 8640HS reaches 89.6 GB/s, while the 7735U is capped at 76.8 GB/s. Both use the same AMD Socket FP7 and offer PCIe Gen 4 with 20 lanes (CPU only). Integrated graphics also differ, with the 8640HS featuring the Radeon 760M and the 7735U using the Radeon 680M. The 8640HS was released on 2024-04-15, while the 7735U came earlier on 2023-01-03. Both are active in production and have locked multipliers.

FAQ

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

A: The Ryzen 5 PRO 8640HS is significantly faster. In Cinebench R23 multi-core, it scores 18104 versus 10085 for the Ryzen 7 7735U, a 79.5% lead. Even in the older R15 test, the 8640HS wins with 1824 vs 1698.

Q: Does the Ryzen 7 7735U win any benchmarks?

A: Yes. The 7735U wins PassMark integer math (79580 vs 69839, a 12.2% lead), data compression (250457 vs 246446, 1.6% ahead), and data encryption (15825 vs 14962, 5.5% ahead).

Q: How do the core counts compare?

A: The Ryzen 7 7735U has 8 cores and 16 threads, while the Ryzen 5 PRO 8640HS has 6 cores and 12 threads. Despite fewer cores, the 8640HS wins the majority of multi-threaded benchmarks.

Q: What is the difference in memory bandwidth?

A: The Ryzen 5 PRO 8640HS supports 89.6 GB/s, while the Ryzen 7 7735U supports 76.8 GB/s. Both use dual-channel DDR5.

Q: Are the integrated graphics different?

A: Yes. The 8640HS comes with the Radeon 760M, while the 7735U uses the Radeon 680M. No benchmark scores for these iGPUs are provided in the data.

Q: Which chip has a higher boost clock?

A: The Ryzen 5 PRO 8640HS boosts to 4.90 GHz, compared to 4.75 GHz for the Ryzen 7 7735U. The 8640HS also has a higher base clock at 3.50 GHz vs 2.70 GHz.

Specification Differences

The two processors differ in several key specification fields. The 8640HS has 6 cores and 12 threads, whereas the 7735U has 8 cores and 16 threads. Base clocks are 3.50 GHz for the 8640HS and 2.70 GHz for the 7735U; boost clocks are 4.90 GHz and 4.75 GHz respectively. The architecture is Zen 4 (Hawk Point) for the 8640HS and Zen 3+ (Rembrandt-R) for the 7735U. Process nodes are 4 nm and 6 nm, with die sizes of 178 mm² and 208 mm² respectively. Transistor count is listed for the 8640HS at 25,000 million; no figure is given for the 7735U. L2 cache is 1 MB per core on the 8640HS versus 512 KB per core on the 7735U. Memory bandwidth is 89.6 GB/s for the 8640HS and 76.8 GB/s for the 7735U. Integrated graphics are Radeon 760M versus Radeon 680M. Release dates are 2024-04-15 for the 8640HS and 2023-01-03 for the 7735U. Both share the same socket (AMD Socket FP7), TDP (28 W), memory type (DDR5), bus (dual-channel), ECC support, PCIe configuration (Gen 4, 20 lanes), market segment (Mobile), and production status (Active).

Where Each One Wins

The Ryzen 5 PRO 8640HS is the clear choice for CPU-bound creative workloads. Its 79.5% lead in Cinebench R23 multi-core makes it suitable for video editing, 3D rendering, and software compilation. The 71.5% single-core advantage in the same test indicates stronger responsiveness in applications that rely on a few fast threads, such as web browsing, office suites, and light CAD. The 13.2% lead in extended instructions suggests better performance in cryptography, scientific computing, and media encoding that leverage AVX-512 or similar instruction sets. The 10% single-thread PassMark win further cements its position for daily driver tasks. For users who prioritize rendering speed and snappy interaction, the 8640HS is the superior part.

The Ryzen 7 7735U, despite losing the overall benchmark count, has its own niches. Its 12.2% lead in integer math points to strength in general-purpose arithmetic, which can benefit database operations, spreadsheet calculations, and some game logic. The wins in data compression (1.6%) and encryption (5.5%) make it marginally better for file archiving, disk imaging, and VPN or full-disk encryption workloads. The 7735U also offers two additional cores, which may help in scenarios where thread count is the bottleneck despite lower IPC, though the benchmark data shows the 8640HS winning most multi-threaded tests anyway. Users with specific integer-heavy processing pipelines might find the 7735U’s edge valuable.

The Verdict

The data directs different buyers to different chips. The AMD Ryzen 5 PRO 8640HS is the higher-performing processor in the aggregate, winning 12 of 15 head-to-head benchmarks. Its dominance in Cinebench R23, where it is 79.5% ahead in multi-core and 71.5% ahead in single-core, makes it the obvious pick for anyone running professional content creation tools, engineering simulations, or heavy multitasking. The newer Zen 4 architecture, smaller 4 nm node, larger L2 cache, and higher memory bandwidth all contribute to its decisive lead. Buyers who need maximum rendering throughput and single-thread speed should choose the 8640HS without hesitation.

The AMD Ryzen 7 7735U is not obsolete, but its appeal is narrower. It wins in integer math, data compression, and encryption, making it a reasonable option for specialized workloads like file servers, data processing pipelines, or security-focused applications. Its lower clock speeds and older Zen 3+ architecture hold it back in most general-purpose tests. The extra two cores do not translate into a win in Cinebench R23, indicating that they cannot compensate for the IPC deficit. For users whose primary tasks involve heavy integer arithmetic or data encryption, the 7735U offers a measurable advantage. For everyone else, the Ryzen 5 PRO 8640HS is the superior choice, providing better performance across the vast majority of benchmark scenarios at the same 28 W TDP.