AMD Ryzen 5 PRO 8640HS vs AMD Ryzen AI 5 430 Comparison

The AMD Ryzen 5 PRO 8640HS and AMD Ryzen AI 5 430 are both 28-watt mobile processors, but the benchmark data shows they serve very different workloads. The Ryzen 5 PRO 8640HS wins 12 of the 15 recorded head-to-head comparisons, while the Ryzen AI 5 430 wins only 3. The database places the Ryzen 5 PRO 8640HS in the 80th percentile of all CPUs, with an average benchmark score of 28478, while the Ryzen AI 5 430 sits in the 73rd percentile with an average score of 19617. The gap in average score is substantial, roughly 45% between the two, and the head-to-head deltas confirm that the 8640HS is the dominant part for multi-threaded and compute-heavy tasks. However, the Ryzen AI 5 430 posts a small but consistent lead in single-threaded PassMark tests, which suggests a narrower advantage in lightly threaded workloads.

Where Each One Wins

The AMD Ryzen 5 PRO 8640HS is the clear winner in every multi-core rendering stress test. In Cinebench R23 multi-core, the 8640HS scores 18104 against 8130 for the Ryzen AI 5 430, a delta of 122.7%. The same pattern appears in Cinebench R15 multi-core, where the 8640HS posts 1824 versus 1195, a 52.6% advantage. These results indicate that the 8640HS is the better choice for sustained CPU rendering, video encoding, and any workload that scales across all cores.

The Ryzen 5 PRO 8640HS also wins every PassMark compute test by wide margins. Data encryption shows the biggest gap, with the 8640HS scoring 14962 against 7591, a 97.1% delta. Integer math follows at 69839 versus 39637, a 76.2% advantage. Random string sorting delivers an 81.9% lead, with scores of 30235 and 16623. The 8640HS also leads in extended instructions (18507 vs 11455), floating point math (43019 vs 27193), find prime numbers (71 vs 44), physics (1043 vs 726), data compression (246446 vs 158912), and multithreaded PassMark (21465 vs 13320). In every one of these tests, the 8640HS is ahead by at least 43.7%, which is the smallest margin, seen in physics.

The AMD Ryzen AI 5 430 wins only the single-threaded Cinebench R15 test and the two PassMark single-thread entries. In Cinebench R15 single-core, the AI 5 430 scores 269 versus 257, a 4.5% lead. In PassMark single-thread, it scores 3683 versus 3561, a 3.3% lead. These are narrow margins, and they do not offset the massive multi-core deficits. The AI 5 430 appears better suited for short, single-threaded bursts or tasks that rely on a single fast core, but the 8640HS remains the stronger overall compute part.

One notable difference is the Cinebench R23 single-core result. Here, the 8640HS wins with a score of 2555 against 1797, a 42.2% delta. This is an outlier compared to the other single-thread tests, where the AI 5 430 wins. The R23 single-core score for the AI 5 430 is much lower relative to its other single-thread results, which suggests that the AI 5 430 may sustain lower clocks under longer single-threaded loads, while the 8640HS maintains a higher boost across the test duration.

Architecture Differences

The two processors use different socket types and generations. The AMD Ryzen 5 PRO 8640HS uses AMD Socket FP7, belongs to the 8000 series, and is based on Zen 4 architecture with the Hawk Point codename. The AMD Ryzen AI 5 430 uses AMD Socket FP8, belongs to the Ryzen AI 400 series, and uses the Gorgon Point codename with a hybrid Zen 5 / Zen 5c configuration. Both processors are built on TSMC's 4 nm process node, but the 8640HS has a transistor count of 25,000 million on a 178 mm² die, while the AI 5 430 does not have recorded transistor or die size data in the database.

The core counts are a major differentiator. The 8640HS has 6 cores and 12 threads, while the AI 5 430 has 4 cores and 8 threads. This explains the large multi-core deltas, as the 8640HS has 50% more cores and threads. Base and boost clocks also favor the 8640HS: it runs at 3.50 GHz base and 4.90 GHz boost, while the AI 5 430 runs at 2.00 GHz base and 4.50 GHz boost. The lower base clock on the AI 5 430 is likely a factor in its weaker multi-core performance, as it cannot sustain high frequencies across all cores.

Cache configurations differ substantially. The 8640HS has 64 KB of L1 per core and 1 MB of L2 per core, with 16 MB of shared L3. The AI 5 430 has 80 KB of L1 per core and 1 MB of L2 per core, but only 4 MB of L3. The larger L3 on the 8640HS likely contributes to its strong performance in data compression and random string sorting, where cache locality matters. The AI 5 430's larger L1 per core suggests a faster access path for per-core data, but the small L3 limits its ability to share data across cores.

Memory support is similar but not identical. Both support dual-channel memory with an 89.6 GB/s bandwidth and both support ECC memory. The 8640HS supports DDR5 only, while the AI 5 430 supports DDR5 and LPDDR5X. PCIe lane counts also differ: the 8640HS has Gen 4 with 20 lanes (CPU only), while the AI 5 430 has Gen 4 with 14 lanes (CPU only). Integrated graphics differ as well, with the 8640HS using Radeon 760M and the AI 5 430 using Radeon 840M. The database does not record graphics benchmark scores, so the performance difference is not quantified here.

Head-to-Head Benchmarks

The largest win for the AMD Ryzen 5 PRO 8640HS comes in Cinebench R23 multi-core, where it scores 18104 versus 8130, a 122.7% advantage. This is more than double the AI 5 430's score and reflects the combination of more cores, higher clocks, and larger L3. The second-largest win is in PassMark data encryption, with a 97.1% delta (14962 vs 7591), which indicates that the 8640HS has substantially better cryptographic throughput, likely due to the Zen 4 architecture's AES instructions and higher core count.

PassMark random string sorting shows an 81.9% delta, with the 8640HS scoring 30235 against 16623. This workload depends on memory bandwidth and cache efficiency, and the 16 MB L3 on the 8640HS likely gives it a significant edge over the 4 MB L3 on the AI 5 430. Integer math shows a 76.2% delta (69839 vs 39637), and extended instructions show a 61.6% delta (18507 vs 11455). Floating point math delivers a 58.2% delta (43019 vs 27193), and multithreaded PassMark shows a 61.1% delta (21465 vs 13320). Find prime numbers shows a 61.4% delta (71 vs 44), and data compression shows a 55.1% delta (246446 vs 158912). Cinebench R15 multi-core shows a 52.6% delta (1824 vs 1195), and physics shows the smallest multi-core margin at 43.7% (1043 vs 726).

The three wins for the AMD Ryzen AI 5 430 are all small. In Cinebench R15 single-core, it wins 269 versus 257, a 4.5% delta. In PassMark single-thread, it wins 3683 versus 3561, a 3.3% delta. The database records the PassMark single-thread test twice with identical scores, so the AI 5 430's win is consistent across both entries. These margins are minor compared to the 8640HS's multi-core leads, and they suggest that the AI 5 430 has a slightly higher peak single-core frequency in short bursts, even though its boost clock is listed lower at 4.50 GHz versus 4.90 GHz.

FAQ

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

A: The AMD Ryzen 5 PRO 8640HS is faster in every recorded multi-core test. In Cinebench R23 multi-core, it scores 18104 versus 8130 for the Ryzen AI 5 430, a 122.7% advantage. In Cinebench R15 multi-core, it scores 1824 versus 1195, a 52.6% lead.

Q: Does the AMD Ryzen AI 5 430 win any benchmarks?

A: Yes, it wins three tests: Cinebench R15 single-core (269 vs 257), and PassMark single-thread (3683 vs 3561, recorded twice). All three wins are narrow, with deltas of 4.5% or 3.3%.

Q: How do the core counts compare?

A: The Ryzen 5 PRO 8640HS has 6 cores and 12 threads, while the Ryzen AI 5 430 has 4 cores and 8 threads. This gives the 8640HS a 50% advantage in core and thread count.

Q: Which processor has more L3 cache?

A: The Ryzen 5 PRO 8640HS has 16 MB of shared L3 cache, while the Ryzen AI 5 430 has 4 MB. The 8640HS also has 64 KB of L1 per core, compared to 80 KB per core on the AI 5 430.

Q: Do both processors use the same manufacturing process?

A: Yes, both are built on TSMC's 4 nm process node. The Ryzen 5 PRO 8640HS uses Zen 4 architecture, while the Ryzen AI 5 430 uses a Zen 5 / Zen 5c hybrid configuration.

Q: What is the average benchmark score difference?

A: The Ryzen 5 PRO 8640HS has an average benchmark score of 28478, while the Ryzen AI 5 430 has an average score of 19617. The 8640HS sits in the 80th percentile of all CPUs, and the AI 5 430 sits in the 73rd percentile.

The Verdict

The benchmark data is unambiguous: the AMD Ryzen 5 PRO 8640HS is the superior processor for compute-intensive tasks. Its 6-core, 12-thread configuration, combined with a 4.90 GHz boost clock and 16 MB of L3 cache, delivers multi-core performance that is often more than double that of the Ryzen AI 5 430. For rendering, encoding, data encryption, and math-heavy workloads, the 8640HS is the clear choice, with deltas ranging from 43.7% to 122.7% across all multi-core tests.

The AMD Ryzen AI 5 430 has a single redeeming quality: its single-threaded PassMark score of 3683, which edges out the 8640HS's 3561 by 3.3%. It also wins Cinebench R15 single-core by a small margin. This makes it slightly better for short, single-threaded bursts, but the advantage is marginal and does not translate to a win in Cinebench R23 single-core, where the 8640HS leads by 42.2%. The AI 5 430's smaller L3 cache and lower base clock are likely responsible for its inconsistent single-thread results.

For users who need maximum throughput across multiple cores, the Ryzen 5 PRO 8640HS is the only rational pick. It also offers more PCIe lanes (20 versus 14) and a larger transistor count, which indicates a more substantial silicon design. The Ryzen AI 5 430 is a lighter part with fewer cores and a smaller cache footprint, suited for tasks that do not scale well across threads. The data shows no scenario where the AI 5 430's advantages outweigh the 8640HS's broad multi-core dominance.