AMD Ryzen 5 PRO 8645HS vs AMD Ryzen AI 9 365 Comparison

The AMD Ryzen 5 PRO 8645HS and the AMD Ryzen AI 9 365 are both modern mobile processors from AMD, but they are built for different priorities. The data shows a clear split: the Ryzen AI 9 365 dominates in most multi-threaded and math-heavy workloads, while the Ryzen 5 PRO 8645HS shows a distinct advantage in certain legacy and single-core tests. The database records 11 benchmark wins for the Ryzen AI 9 365 against 4 wins for the Ryzen 5 PRO 8645HS, but the margins in those 4 wins are significant.

Where Each One Wins

The AMD Ryzen AI 9 365 is the clear winner for heavily parallel workloads. In Cinebench R15 multicore, it scores 2842 against 1989 for the Ryzen 5 PRO 8645HS, a 30% lead. This pattern repeats across PassMark's compute suite. The AI 9 365 delivers 354510 in data compression versus 265826, a 25% advantage. In integer math, it posts 101831 versus 72740, a 28.6% margin. Floating point math shows a 27.6% gap, with 62802 against 45481. Prime number finding, a pure CPU throughput test, shows the largest relative gap at 37.6%, with 117 versus 73. The AI 9 365 also wins in data encryption by 5% (18297 vs 17387), extended instructions by 15.5% (25113 vs 21212), multithread by 20% (29467 vs 23569), physics by 29.1% (1704 vs 1208), and random string sorting by 10.1% (39447 vs 35472). This is a comprehensive sweep of compute-oriented tasks.

The AMD Ryzen 5 PRO 8645HS wins in exactly four recorded tests. The most notable is Cinebench R23 singlecore, where it scores 2787 versus 1992 for the AI 9 365, a 39.9% lead. It also wins Cinebench R23 multicore, albeit by a smaller margin: 19742 versus 18698, a 5.6% advantage. The two PassMark single-thread tests (listed as both `single_thread` and `singlethread`) are won by the Ryzen 5 PRO 8645HS with scores of 3858 versus 3841, a razor-thin 0.4% edge. These wins suggest that for applications relying on older single-core performance models or specific instruction paths, the Ryzen 5 PRO 8645HS has an edge, but the AI 9 365 is the broader performer.

Architecture Differences

The two chips come from different architectural generations. The Ryzen 5 PRO 8645HS uses Zen 4 architecture, codenamed Hawk Point, from the 8000 series. The Ryzen AI 9 365 uses Zen 5 and Zen 5c, codenamed Strix Point, from the Ryzen AI 300 generation. Both are built on TSMC's 4 nm process, but the die sizes differ: the Ryzen 5 PRO 8645HS measures 178 mm² with 25,000 million transistors, while the Ryzen AI 9 365 measures a larger 233 mm² with no transistor count recorded in the database.

Core counts separate them clearly. The Ryzen 5 PRO 8645HS has 6 cores and 12 threads, with a base clock of 4.30 GHz and a boost clock of 5.00 GHz. The Ryzen AI 9 365 has 10 cores and 20 threads, but its base clock is much lower at 2.00 GHz while the boost clock is identical at 5.00 GHz. This hybrid configuration, combining Zen 5 and Zen 5c cores, explains the lower base frequency: it prioritizes efficiency cores for background tasks while relying on boost for peak performance. The Ryzen 5 PRO 8645HS is a more conventional high-frequency design.

Cache hierarchies differ per-core. The Ryzen 5 PRO 8645HS has 64 KB of L1 per core and 1 MB of L2 per core, with 16 MB of shared L3. The Ryzen AI 9 365 has a larger 80 KB L1 per core, the same 1 MB L2 per core, and 16 MB of L3. Both support dual-channel memory with 89.6 GB/s bandwidth, but the Ryzen 5 PRO 8645HS supports DDR5 and ECC memory, while the Ryzen AI 9 365 supports DDR5 and LPDDR5X but does not enable ECC. PCIe lanes also differ: the Ryzen 5 PRO 8645HS offers Gen 4 with 20 lanes (CPU only), while the Ryzen AI 9 365 offers Gen 4 with 16 lanes (CPU only).

The integrated graphics are different as well. The Ryzen 5 PRO 8645HS uses Radeon 760M, while the Ryzen AI 9 365 uses Radeon 880M. The Ryzen AI 9 365 also has a lower TDP at 28 W versus 45 W for the Ryzen 5 PRO 8645HS, which is notable given its higher core count. The sockets are distinct: AMD Socket FP7 for the Ryzen 5 PRO 8645HS and AMD Socket FP8 for the Ryzen AI 9 365.

The Verdict

The data points to two different buyer profiles. The AMD Ryzen AI 9 365 is the better choice for anyone whose workload scales with cores and threads. Its 10 cores and 20 threads, combined with the newer Zen 5 architecture, produce consistently higher scores across Cinebench R15 multicore and nearly all PassMark compute tests. The benchmark results indicate a 30% lead in Cinebench R15 multicore and a 28.6% lead in integer math, making it the stronger option for rendering, compilation, data processing, or any parallel task. Its 87th percentile versus all CPUs, compared to the 82nd percentile for the Ryzen 5 PRO 8645HS, reinforces this positioning.

The AMD Ryzen 5 PRO 8645HS is the pick for single-thread-heavy applications that rely on older benchmark patterns. Its Cinebench R23 singlecore score of 2787 is 39.9% higher than the AI 9 365's 1992, a massive gap. It also wins Cinebench R23 multicore by 5.6% despite having only 6 cores, which suggests that the higher base clock of 4.30 GHz matters more in that specific test than raw core count. The Ryzen 5 PRO 8645HS also offers ECC memory support, a feature absent from the AI 9 365, which could be decisive for certain workstation or reliability-focused builds.

The Ryzen AI 9 365 is the overall average score leader, with an avgBenchmarkScore of 40048 versus 30879 for the Ryzen 5 PRO 8645HS. That 30% average gap matches the multicore pattern. The Ryzen 5 PRO 8645HS is not a weak chip, it sits near the AMD Ryzen 7 8700F (0.4% delta) and Intel Core i7-12700F (0.6% delta), but the AI 9 365 competes with the AMD Ryzen 7 7700 (0.1% delta) and Intel Core i9-13905H (0.7% delta). The AI 9 365 is simply in a higher performance tier.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD Ryzen AI 9 365 has 10 cores and 20 threads. The AMD Ryzen 5 PRO 8645HS has 6 cores and 12 threads.

Q: Which CPU is faster in single-threaded Cinebench R23?

A: The AMD Ryzen 5 PRO 8645HS is significantly faster, scoring 2787 versus 1992 for the AMD Ryzen AI 9 365, a 39.9% advantage.

Q: Which CPU wins in PassMark integer math?

A: The AMD Ryzen AI 9 365 wins with a score of 101831, compared to 72740 for the AMD Ryzen 5 PRO 8645HS, a 28.6% margin.

Q: Do both CPUs support the same memory type?

A: No. The AMD Ryzen 5 PRO 8645HS supports DDR5 and ECC memory. The AMD Ryzen AI 9 365 supports DDR5 and LPDDR5X but does not support ECC memory.

Q: How do their average benchmark scores compare?

A: The AMD Ryzen AI 9 365 has an average benchmark score of 40048, while the AMD Ryzen 5 PRO 8645HS has an average score of 30879. The AI 9 365 sits at the 87th percentile versus all CPUs, the Ryzen 5 PRO 8645HS at the 82nd percentile.

Q: Which CPU has a higher boost clock?

A: Both CPUs have the same boost clock of 5.00 GHz. The base clocks differ, with the Ryzen 5 PRO 8645HS at 4.30 GHz and the Ryzen AI 9 365 at 2.00 GHz.

Head-to-Head Benchmarks

The largest single win for the AMD Ryzen AI 9 365 comes in Cinebench R15 multicore, where it scores 2842 against 1989, a 30% lead. This is a fundamental advantage in short, heavily threaded bursts. The AI 9 365 also shows a 37.6% lead in PassMark find prime numbers, scoring 117 versus 73, which indicates raw integer throughput per thread is much higher despite the lower base clock. In floating point math, the AI 9 365 scores 62802 versus 45481, a 27.6% gap, and in integer math it scores 101831 versus 72740, a 28.6% gap. Data compression favors the AI 9 365 at 25% (354510 vs 265826), and physics at 29.1% (1704 vs 1208). Multithread sees a 20% lead (29467 vs 23569). Extended instructions, random string sorting, and data encryption also go to the AI 9 365 with margins of 15.5%, 10.1%, and 5% respectively.

The AMD Ryzen 5 PRO 8645HS has its own decisive victories. The most striking is Cinebench R23 singlecore, where it scores 2787 versus 1992, a 39.9% margin. This is the largest delta in either direction across all head-to-head tests. It also wins Cinebench R23 multicore by 5.6%, scoring 19742 versus 18698. That win is notable because the Ryzen 5 PRO 8645HS has only 6 cores, yet it outperforms a 10-core chip in that specific rendering test. The PassMark single-thread tests are nearly identical, with the Ryzen 5 PRO 8645HS winning by 0.4% (3858 vs 3841), which is effectively a tie but still a recorded win.

The overall pattern is consistent: the AI 9 365 wins where thread count and newer architecture matter, while the Ryzen 5 PRO 8645HS wins where high base clock and older single-core behavior dominate. The R23 results are the exception, where the Ryzen 5 PRO 8645HS holds a multicore edge, but this does not extend to Cinebench R15 multicore, where the AI 9 365 leads by 30%. The database shows 11 wins for the AI 9 365 and 4 for the Ryzen 5 PRO 8645HS, with the AI 9 365's average score of 40048 confirming its status as the higher-tier part.

Specification Differences

The two processors differ across several key specifications. The Ryzen 5 PRO 8645HS uses Zen 4 architecture with the Hawk Point codename, while the Ryzen AI 9 365 uses Zen 5 and Zen 5c with the Strix Point codename. Core counts are 6 versus 10, threads are 12 versus 20. Base clocks are 4.30 GHz versus 2.00 GHz, while boost clocks are identical at 5.00 GHz. TDP differs significantly: 45 W for the Ryzen 5 PRO 8645HS versus 28 W for the Ryzen AI 9 365. The sockets are FP7 versus FP8.

L1 cache is 64 KB per core for the Ryzen 5 PRO 8645HS versus 80 KB per core for the Ryzen AI 9 365. L2 cache is identical at 1 MB per core, and L3 cache is identical at 16 MB shared. The die size is 178 mm² versus 233 mm², with transistor counts of 25,000 million for the Ryzen 5 PRO 8645HS and no recorded count for the AI 9 365. Memory support differs: DDR5 only versus DDR5 and LPDDR5X. ECC memory is supported on the Ryzen 5 PRO 8645HS but not on the AI 9 365. PCIe lanes are 20 versus 16, both Gen 4. Integrated graphics are Radeon 760M versus Radeon 880M. The release dates differ, with the Ryzen 5 PRO 8645HS launching on 2024-04-15 and the Ryzen AI 9 365 on 2024-06-30. The process node is the same at 4 nm from TSMC.