AMD Ryzen 5 PRO 8645HS vs AMD Ryzen 7 7736U Comparison

The AMD Ryzen 5 PRO 8645HS and AMD Ryzen 7 7736U are two very different mobile processors that land surprisingly close in overall performance. The 8645HS wins 12 of the 15 head-to-head benchmarks, while the 7736U takes only 3. Despite this, the average benchmark scores are nearly identical: the 8645HS posts 30,879 against the 7736U’s 30,364. The Ryzen 5 PRO’s advantage comes from sheer architectural efficiency and higher clock speeds, while the Ryzen 7’s wins are concentrated in specific multi-threaded and integer workloads where its extra cores and threads matter more.

Head-to-Head Benchmarks

The most dramatic difference appears in the Cinebench R23 tests. In the multicore test, the Ryzen 5 PRO 8645HS scores 19,742 against the 7736U’s 12,768, a massive 54.6% lead. This is the single largest gap in the entire comparison and suggests that the Zen 4 architecture’s higher instructions-per-clock and the 8645HS’s 5.00 GHz boost clock completely overwhelm the 7736U’s two extra cores. The single-core R23 result is even more lopsided in percentage terms: 2,787 versus 1,548, an 80% advantage for the 8645HS. In Cinebench R15, the pattern partially reverses in multicore, where the 7736U edges ahead with 2,019 against 1,989, a 1.5% margin. However, the R15 single-core test still goes decisively to the 8645HS: 280 versus 246, a 13.8% win.

Looking at the Passmark suite, the 8645HS dominates in most categories. The data encryption test shows an 11.2% lead (17,387 vs 15,635), while extended instructions go to the 8645HS with 21,212 versus 19,384, a 9.4% difference. Prime number finding is another clear win: 73 versus 56, a 30.4% advantage. Floating point math is close, with the 8645HS at 45,481 against 44,499, only 2.2% ahead. The multithread score also favors the 8645HS: 23,569 versus 21,725, an 8.5% margin. Physics performance goes to the 8645HS with 1,208 against 1,007, a 20% lead. Random string sorting shows a 25.9% advantage for the 8645HS (35,472 vs 28,172). Single-thread performance is consistently 15.2% higher for the 8645HS: 3,858 versus 3,350.

The 7736U’s three wins are all in the Passmark suite. Data compression goes to the 7736U with 274,440 versus 265,826, a 3.1% margin. Integer math shows a 7.7% advantage for the 7736U: 78,821 versus 72,740. The third win is in Cinebench R15 multicore, as noted above. Interestingly, the 7736U’s wins all involve workloads that scale well with core count or benefit from its larger L2 cache layout per core. The 8645HS wins are more numerous and often larger in magnitude, explaining why its overall percentile ranking is 82 versus the 7736U’s 81.

FAQ

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

A: The AMD Ryzen 5 PRO 8645HS is consistently ahead. Its Cinebench R23 single-core score is 2,787 versus 1,548 for the 7736U, an 80% advantage. Passmark single-thread mirrors this at 3,858 versus 3,350, a 15.2% lead.

Q: Does the Ryzen 7 7736U win any benchmarks?

A: Yes, it wins three head-to-head tests: Cinebench R15 multicore (2,019 vs 1,989), Passmark data compression (274,440 vs 265,826), and Passmark integer math (78,821 vs 72,740). These wins are modest, ranging from 1.5% to 7.7%.

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

A: The results are mixed. The 8645HS leads Cinebench R23 multicore by 54.6% (19,742 vs 12,768) and Passmark multithread by 8.5% (23,569 vs 21,725). However, the 7736U wins Cinebench R15 multicore by 1.5% and integer math by 7.7%.

Q: What is the difference in average benchmark scores?

A: The 8645HS has an average benchmark score of 30,879, while the 7736U averages 30,364. The 8645HS also holds a slightly higher percentile ranking at 82 versus the 7736U’s 81.

Q: Which processor has a higher boost clock?

A: The 8645HS has a boost clock of 5.00 GHz, while the 7736U boosts to 4.70 GHz. The base clocks also differ significantly: 4.30 GHz for the 8645HS versus 2.70 GHz for the 7736U.

Q: Are both processors based on the same architecture?

A: No. The 8645HS uses the newer Zen 4 architecture (codenamed Hawk Point), while the 7736U uses Zen 3+ (codenamed Rembrandt-R). This architectural difference is a key factor in the benchmark gaps.

Architecture Differences

The two CPUs belong to different AMD generations and microarchitectures. The Ryzen 5 PRO 8645HS is part of the 8000 series, built on the Zen 4 architecture with the codename Hawk Point. It uses a 4 nm process node from TSMC and packs 25,000 million transistors into a 178 mm² die. In contrast, the Ryzen 7 7736U is from the 7000 series, based on the older Zen 3+ architecture with the codename Rembrandt-R. It is manufactured on a 6 nm process node and has a larger die size of 208 mm². Transistor count for the 7736U is not listed, but the larger die on an older node suggests a less dense design.

The cache hierarchies differ in an important way. Both share 64 KB of L1 cache per core and 16 MB of shared L3 cache. However, the L2 cache per core is 1 MB on the 8645HS versus 512 KB on the 7736U. This gives the 8645HS a total L2 advantage that likely contributes to its superior single-thread and latency-sensitive performance. The memory bandwidth also differs: the 8645HS supports 89.6 GB/s versus 76.8 GB/s for the 7736U, both over DDR5 dual-channel memory. Both support ECC memory and use PCIe Gen 4 with 20 lanes (CPU only). The integrated graphics differ as well: the 8645HS has a Radeon 760M, while the 7736U has a Radeon 680M.

The release dates are roughly a year apart, with the 7736U launching on 2023-01-03 and the 8645HS on 2024-04-15. Both are currently marked as Active in production. Neither processor has an unlocked multiplier, and both use the AMD Socket FP7. The 8645HS has two part numbers (100-000001315 for FP7r2 and 100-000001388 for FP7), while the 7736U also has two (100-000000534 for FP7 and 100-000000617 for FP7r2).

Specification Differences

The most obvious specification difference is core count. The 8645HS has 6 cores and 12 threads, while the 7736U has 8 cores and 16 threads. Clock speeds diverge sharply: the 8645HS runs at a 4.30 GHz base and 5.00 GHz boost, whereas the 7736U is much more conservative at 2.70 GHz base and 4.70 GHz boost. The thermal design power (TDP) reflects this: the 8645HS is rated at 45 W, while the 7736U is rated at just 15 W.

Memory bandwidth is another differentiator, with the 8645HS offering 89.6 GB/s versus 76.8 GB/s for the 7736U. The process node differs (4 nm vs 6 nm), as does the die size (178 mm² vs 208 mm²). The L2 cache per core is double on the 8645HS (1 MB vs 512 KB). The integrated graphics units are different models: Radeon 760M on the 8645HS and Radeon 680M on the 7736U. The architectures are Zen 4 versus Zen 3+, and the codenames are Hawk Point versus Rembrandt-R. Release dates differ by over a year (2024-04-15 vs 2023-01-03). The transistor count and die size are listed for the 8645HS but the transistor count is not available for the 7736U.

The Verdict

Benchmark results indicate that the Ryzen 5 PRO 8645HS is the faster processor in the majority of tests, particularly in single-threaded and lightly-threaded workloads. Its 80% lead in Cinebench R23 single-core is striking, as is its 54.6% lead in the corresponding multicore test. For users who prioritize raw CPU performance in everyday tasks, content creation, or software compilation, the data clearly favors the 8645HS. Its higher clock speeds and newer Zen 4 architecture deliver consistently higher scores across encryption, extended instructions, physics, and sorting workloads. The 8645HS also holds a slight edge in average benchmark score (30,879 vs 30,364) and percentile rank (82 vs 81).

The Ryzen 7 7736U is not without merit, but its wins are narrower and fewer. Its three benchmark victories — Cinebench R15 multicore, data compression, and integer math — suggest it handles certain parallel integer workloads slightly better, likely due to its two additional cores. However, the magnitude of these wins (1.5% to 7.7%) is far smaller than the 8645HS’s margins in its winning tests. The 7736U’s much lower 15 W TDP does make it an interesting option for power-constrained designs, but the benchmark data does not show a performance advantage that would justify choosing it over the 8645HS in most scenarios.

Where Each One Wins

The Ryzen 5 PRO 8645HS is the clear winner for anyone running single-threaded applications, office productivity, web browsing, or any workload that relies on high clock speeds and modern IPC. Its performance in Cinebench R23 single-core (2,787) and Passmark single-thread (3,858) makes it the better choice for responsiveness in everyday use. It also dominates in encryption (17,387 vs 15,635), extended instruction sets (21,212 vs 19,384), and physics simulation (1,208 vs 1,007). For multithreaded rendering in Cinebench R23, the 54.6% advantage means the 8645HS will finish render jobs significantly faster. Random string sorting, which often reflects database or scripting workloads, also favors the 8645HS by 25.9%.

The Ryzen 7 7736U has a more limited but real niche. Its 8 cores and 16 threads provide a slight edge in integer math (78,821 vs 72,740) and data compression (274,440 vs 265,826). These are workloads that can parallelize well across many cores. If a user’s primary applications are file archiving, compression tools, or integer-heavy computation, the 7736U offers a modest advantage. Its Cinebench R15 multicore win (2,019 vs 1,989) is marginal and unlikely to be perceptible in real-world use. The 7736U’s 15 W TDP also makes it a more plausible fit for fanless or ultra-low-power designs, though the benchmark data shows this comes at a significant cost to overall performance. For most users, the 8645HS’s sweeping benchmark dominance makes it the stronger choice.