AMD Ryzen 5 PRO 8640U vs AMD Ryzen AI 9 365 Comparison

The AMD Ryzen 5 PRO 8640U and the AMD Ryzen AI 9 365 are both 28-watt mobile processors, but they occupy different corners of the performance spectrum. The Ryzen 5 PRO 8640U is a 6-core, 12-thread Zen 4 part, while the Ryzen AI 9 365 is a 10-core, 20-thread Zen 5 design. Benchmark data shows a clear split: the Ryzen AI 9 365 dominates in multi-threaded and compute-heavy workloads, while the Ryzen 5 PRO 8640U surprisingly wins in Cinebench R23, particularly in single-core performance. The database records 2 benchmark wins for the 8640U and 13 for the AI 9 365, yet the nature of those wins tells a more complex story about workload suitability.

Where Each One Wins

The AMD Ryzen AI 9 365 is the clear winner for parallel processing and sustained compute. It takes a 29.1% lead in Cinebench R15 multicore, scoring 2842 against 2014. PassMark results reinforce this trend: the AI 9 365 leads by 26.5% in integer math (101831 vs 74875), 27.9% in floating point math (62802 vs 45265), and 33.3% in prime number finding (117 vs 78). Data compression shows a 26.4% advantage (354510 vs 260925), and encryption is 13.4% faster (18297 vs 15843). Physics simulation, a proxy for gaming and simulation workloads, is 32.3% ahead (1704 vs 1154). The multithread score of 29467 versus 22795 gives the AI 9 365 a 22.6% edge in overall threaded throughput.

The AMD Ryzen 5 PRO 8640U wins in Cinebench R23, and it does so decisively. Its multicore score of 19982 beats the AI 9 365's 18698 by 6.9%. The single-core R23 result is even more striking: 2821 versus 1992, a 41.6% advantage. This is the largest single delta in the head-to-head data. The 8640U also posts a higher Cinebench R23 single-core score despite the AI 9 365 having a higher boost clock of 5.00 GHz versus 4.90 GHz. For workloads that rely on older Cinebench versions or single-threaded R23 performance, the 8640U is the stronger choice. In PassMark single-thread, the AI 9 365 leads by a slim 2.8% (3841 vs 3732), suggesting the 8640U's R23 single-core dominance is an anomaly rather than a general trend.

Architecture Differences

The two processors are built on different Zen generations. The Ryzen 5 PRO 8640U uses Zen 4 architecture under the Hawk Point codename, while the Ryzen AI 9 365 uses Zen 5 under the Strix Point codename, specifically a hybrid of Zen 5 and Zen 5c cores. Both are fabricated on TSMC's 4 nm process, but the die sizes differ substantially: the 8640U measures 178 mm², while the AI 9 365 is larger at 233 mm². The transistor counts reflect this gap, with the 8640U containing 25,000 million transistors and the AI 9 365's count not recorded in the database.

Cache configurations also diverge. The 8640U has 64 KB of L1 per core and 1 MB of L2 per core, with 16 MB of shared L3. The AI 9 365 has 80 KB of L1 per core and 1 MB of L2 per core, also with 16 MB of L3. The per-core L1 increase in Zen 5 suggests better instruction feeding for the newer architecture. Memory support differs as well: the 8640U supports DDR5 only, while the AI 9 365 supports both DDR5 and LPDDR5X. Both use dual-channel memory buses with 89.6 GB/s of bandwidth. ECC memory is supported on the 8640U but not on the AI 9 365, a notable distinction for reliability-focused deployments.

The integrated graphics differ, with the 8640U using Radeon 760M and the AI 9 365 using Radeon 880M. PCIe connectivity is also different: the 8640U offers Gen 4 with 20 lanes, while the AI 9 365 offers Gen 4 with 16 lanes. The sockets are incompatible, with the 8640U on AMD Socket FP7 and the AI 9 365 on AMD Socket FP8. The AI 9 365 is a newer release, dated 2024-06-30, while the 8640U launched on 2024-04-15.

The Verdict

The data suggests the AMD Ryzen AI 9 365 is the better processor for multi-threaded productivity and compute-heavy tasks. Its wins in PassMark integer math, floating point math, data compression, encryption, and physics give it a broad advantage across nearly every parallel workload category. The 87th percentile ranking versus the 8640U's 81st percentile confirms its higher overall standing in the database. For users running compilation, video encoding, scientific simulations, or data processing, the AI 9 365 is the clear pick.

The AMD Ryzen 5 PRO 8640U wins in Cinebench R23 multicore and single-core, which is unusual given its smaller core count. The 41.6% single-core R23 advantage over the AI 9 365 is the largest margin in the entire dataset. This makes the 8640U appealing for legacy Cinebench R23 workflows or any application that mirrors that benchmark's single-threaded behavior. However, the AI 9 365's narrow 2.8% PassMark single-thread lead suggests the 8640U's R23 single-core win may not translate to other single-threaded apps.

The choice depends on the benchmark suite that matters most. The AI 9 365 is the safer bet for general-purpose performance, given its 13 wins and higher average benchmark score of 40048 versus 30254. The 8640U's two wins are narrow in multicore (6.9%) but massive in R23 single-core (41.6%). The AI 9 365 also supports LPDDR5X memory, which could enable lower-power or higher-bandwidth system designs, though the recorded bandwidth is identical at 89.6 GB/s.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen AI 9 365 has 10 cores and 20 threads. The AMD Ryzen 5 PRO 8640U has 6 cores and 12 threads.

Q: How do the two compare in Cinebench R23 multicore?

A: The Ryzen 5 PRO 8640U scores 19982, which is 6.9% higher than the Ryzen AI 9 365's 18698.

Q: Which processor is faster in PassMark integer math?

A: The Ryzen AI 9 365 scores 101831, which is 26.5% higher than the 8640U's 74875.

Q: Do both processors support the same memory types?

A: No. The 8640U supports DDR5 only. The AI 9 365 supports DDR5 and LPDDR5X. Both have dual-channel buses with 89.6 GB/s bandwidth.

Q: What is the single-core Cinebench R23 difference?

A: The 8640U scores 2821, which is 41.6% higher than the AI 9 365's 1992. This is the largest delta in the head-to-head data.

Q: Which processor has a higher PassMark multithread score?

A: The AI 9 365 scores 29467, which is 22.6% higher than the 8640U's 22795.

Head-to-Head Benchmarks

The Ryzen AI 9 365's largest wins come in compute-heavy PassMark tests. Prime number finding shows a 33.3% lead (117 vs 78). Physics simulation is 32.3% ahead (1704 vs 1154). Floating point math is 27.9% higher (62802 vs 45265). Integer math follows at 26.5% (101831 vs 74875). Data compression sits at 26.4% (354510 vs 260925). Extended instructions show a 23.8% gap (25113 vs 19130). Multithread is 22.6% higher (29467 vs 22795). The smallest AI 9 365 wins are in random string sorting at 18.6% (39447 vs 32114), data encryption at 13.4% (18297 vs 15843), and Cinebench R15 single-core at 6.3% (303 vs 284). PassMark single-thread shows only a 2.8% edge (3841 vs 3732). Cinebench R15 multicore gives the AI 9 365 a 29.1% win (2842 vs 2014).

The Ryzen 5 PRO 8640U's wins are concentrated in Cinebench R23. The single-core score of 2821 beats the AI 9 365's 1992 by 41.6%, the largest margin in the entire dataset. The multicore score of 19982 beats 18698 by 6.9%. These two wins are notable because the 8640U has 4 fewer cores and 8 fewer threads than the AI 9 365. The R23 results stand in contrast to the R15 results, where the AI 9 365 wins by 29.1% in multicore. This benchmark-to-benchmark inconsistency suggests workload-specific optimization differences between Zen 4 and Zen 5.

Specification Differences

| Specification | AMD Ryzen 5 PRO 8640U | AMD Ryzen AI 9 365 |

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

| Cores | 6 | 10 |

| Threads | 12 | 20 |

| Base Clock | 3.50 GHz | 2.00 GHz |

| Boost Clock | 4.90 GHz | 5.00 GHz |

| Socket | AMD Socket FP7 | AMD Socket FP8 |

| Architecture | Zen 4 | Zen 5 |

| Codename | Hawk Point | Strix Point |

| Generation | Ryzen 5 (Zen 4 (Hawk Point)) | Ryzen AI 300 (Zen 5 / Zen 5c) |

| Die Size | 178 mm² | 233 mm² |

| Transistors | 25,000 million | Not recorded |

| L1 Cache | 64 KB (per core) | 80 KB (per core) |

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

| L3 Cache | 16 MB (shared) | 16 MB |

| Memory Support | DDR5 | DDR5, LPDDR5X |

| ECC Memory | Yes | No |

| PCIe | Gen 4, 20 Lanes (CPU only) | Gen 4, 16 Lanes (CPU only) |

| Integrated Graphics | Radeon 760M | Radeon 880M |

| Release Date | 2024-04-15 | 2024-06-30 |

| Part Number | 100-000001318 (FP7r2), 100-000001378 (FP7) | 100-000001530 |

Both processors run at 28 W TDP, use dual-channel memory with 89.6 GB/s bandwidth, and are built on TSMC's 4 nm process. The AI 9 365 has a higher boost clock by 0.10 GHz, but the 8640U has a much higher base clock of 3.50 GHz versus 2.00 GHz. The AI 9 365 is not multiplier unlocked, and neither is the 8640U. The AI 9 365 has a larger die and more L1 cache per core, but the 8640U offers more PCIe lanes and ECC support. The AI 9 365's Radeon 880M graphics represent a newer generation than the 8640U's Radeon 760M.