AMD Ryzen 5 PRO 5655G vs AMD Ryzen 5 PRO 8640HS Comparison

Head-to-Head Benchmarks

The benchmark data shows a clear overall winner, but the story is not one-sided. The AMD Ryzen 5 PRO 8640HS takes 15 of the 17 recorded head-to-head comparisons, with the Ryzen 5 PRO 5655G managing only 2 wins. The margins, however, vary dramatically depending on the workload.

Starting with the most lopsided results, the 8640HS absolutely dominates in `passmark_physics`, scoring 1043 against the 5655G's 686. That is a 52% advantage, the largest single delta in the entire comparison. A similar pattern appears in `passmark_find_prime_numbers`, where the 8640HS scores 71 versus 49, a 44.9% lead. These two tests point to a substantial difference in raw integer and physics computation efficiency that goes well beyond simple clock speed differences.

The multithreaded picture is also strongly in favor of the 8640HS. In `passmark_multithread`, it scores 21465 versus 19129, a 12.2% win. The Cinebench suite reinforces this: `cinebench_r23_multicore` shows 18104 for the 8640HS against 17249 for the 5655G, a 5% margin. The same 5% gap appears in `cinebench_r20_multicore` (7603 vs 7244) and `cinebench_r15_multicore` (1824 vs 1738, a 4.9% delta). These are consistent, moderate wins across every rendering benchmark, indicating the 8640HS scales better with all cores loaded.

Single-core performance tells a similar story. The 8640HS leads in `passmark_single_thread` with 3561 versus 3241, a 9.9% advantage. In Cinebench, the single-core wins are smaller but consistent: `cinebench_r23_singlecore` shows 2555 vs 2435 (4.9%), `cinebench_r20_singlecore` shows 1073 vs 1022 (5%), and `cinebench_r15_singlecore` shows 257 vs 245 (4.9%). The 8640HS also wins `passmark_floating_point_math` by 11.3% (43019 vs 38649) and `passmark_random_string_sorting` by 19.7% (30235 vs 25253). In `passmark_extended_instructions`, it leads 18507 to 17944 (3.1%), and in `passmark_integer_math`, 69839 to 67561 (3.4%).

The Ryzen 5 PRO 5655G's two wins are worth examining. It takes `passmark_data_compression` with 255608 against 246446, a 3.6% margin. It also wins `passmark_data_encryption` at 15253 versus 14962, a 1.9% lead. These are narrow victories, but they are consistent across both data-handling tests, suggesting the 5655G has a slight edge in certain memory-bound or data-streaming operations. Despite these two wins, the overall `avgBenchmarkScore` tells the broader story: the 8640HS averages 28478 across all tests, while the 5655G averages 28032. The 8640HS sits at the 80th percentile among all CPUs, and the 5655G also sits at the 80th percentile, so both are solidly mid-high range parts.

The Verdict

The data is unambiguous for most users: the Ryzen 5 PRO 8640HS is the faster processor in the majority of workloads. It wins every Cinebench test, every PassMark math and physics test, and the single-thread tests. The only two areas where the 5655G pulls ahead are data compression and encryption, and even there the margins are small (3.6% and 1.9% respectively). If your work involves rendering, physics simulation, prime number calculations, floating-point math, or general multithreaded productivity, the 8640HS is the clear pick.

However, the 5655G is not without its niche. The data shows it handles data compression and encryption slightly better, which could matter for specific archival, database, or security-focused workloads. It also has a higher base clock (3.90 GHz vs 3.50 GHz), which might give it a slight responsiveness edge in lightly threaded, short-burst tasks, though the benchmark results do not show this translating into wins outside the two data tests. The 5655G also comes on the AM4 socket, which is a mature platform with a vast ecosystem of motherboards and coolers, whereas the 8640HS uses AMD Socket FP7, a mobile platform. For a desktop builder looking at the 5655G, the platform maturity is a practical advantage. For a mobile or compact system builder, the 8640HS offers superior performance per the recorded scores. Choose the 8640HS for raw speed, choose the 5655G if your specific workload is data compression or encryption, or if you need the AM4 socket.

Architecture Differences

The two processors come from different generations and are built on fundamentally different nodes. The Ryzen 5 PRO 8640HS is part of the 8000 series, using the Zen 4 architecture with the codename Hawk Point. It is fabricated on a 4 nm process at TSMC, with 25,000 million transistors on a 178 mm² die. The Ryzen 5 PRO 5655G is from the 5000 series, using the Zen 3 architecture with the codename Cezanne. It is built on a 7 nm process, also at TSMC, with 10,700 million transistors on a 180 mm² die. The transistor count difference is massive: the 8640HS packs over twice as many transistors, which explains its efficiency and performance advantages despite a similar die area.

Cache configurations differ notably. Both have 64 KB of L1 per core. The 8640HS has 1 MB of L2 per core, while the 5655G has 512 KB per core. The L3 cache is 16 MB shared on the 8640HS, and 16 MB on the 5655G. The larger L2 on the 8640HS likely contributes to its wins in math-heavy and sorting workloads.

Memory support is a major divergence. The 8640HS supports DDR5 memory with a dual-channel bus and a recorded memory bandwidth of 89.6 GB/s. The 5655G supports DDR4 memory, also dual-channel, but with a bandwidth of 51.2 GB/s. That is a 75% bandwidth advantage for the 8640HS, which explains its superior performance in memory-sensitive tests like floating-point math and random string sorting. Both support ECC memory.

PCIe capabilities differ as well. The 8640HS offers Gen 4 with 20 lanes (CPU only), while the 5655G offers Gen 3 with 16 lanes (CPU only). This gives the 8640HS more bandwidth for storage and expansion. The integrated graphics differ too: the 8640HS features a Radeon 760M, while the 5655G has a Radeon Vega 7. The 8640HS is a mobile segment part (FP7 socket), while the 5655G is a desktop part (AM4 socket). The 5655G has a higher TDP at 65 watts versus 28 watts for the 8640HS, which is expected given the desktop versus mobile split.

FAQ

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

A: The Ryzen 5 PRO 8640HS wins all Cinebench multi-core tests. It scores 18104 in `cinebench_r23_multicore` versus 17249 for the 5655G, a 5% advantage. The same 5% margin appears in `cinebench_r20_multicore` (7603 vs 7244) and `cinebench_r15_multicore` (1824 vs 1738).

Q: Does the Ryzen 5 PRO 5655G win any benchmarks at all?

A: Yes, it wins two. It takes `passmark_data_compression` with 255608 versus 246446 (a 3.6% lead) and `passmark_data_encryption` with 15253 versus 14962 (a 1.9% lead).

Q: How big is the single-thread performance gap?

A: The 8640HS leads in `passmark_single_thread` with 3561 versus 3241, a 9.9% advantage. In Cinebench single-core tests, the lead is smaller but consistent: `cinebench_r23_singlecore` shows 2555 vs 2435, a 4.9% gap.

Q: What is the most extreme performance difference between the two?

A: The largest margin is in `passmark_physics`, where the 8640HS scores 1043 against 686 for the 5655G, a 52% advantage. The second largest is `passmark_find_prime_numbers` at 71 versus 49, a 44.9% lead.

Q: Do these processors support the same memory type?

A: No. The 8640HS supports DDR5 with a memory bandwidth of 89.6 GB/s, while the 5655G supports DDR4 with a bandwidth of 51.2 GB/s. Both use a dual-channel bus and support ECC memory.

Q: Are the socket types the same?

A: No. The 8640HS uses AMD Socket FP7 (a mobile socket), while the 5655G uses AMD Socket AM4 (a desktop socket). This means they are not interchangeable in a motherboard.

Where Each One Wins

The Ryzen 5 PRO 8640HS is the winner in every compute-heavy category. It dominates physics calculations (52% lead), prime number finding (44.9% lead), and floating-point math (11.3% lead). It also wins all multithreaded benchmarks, including `passmark_multithread` (21465 vs 19129, a 12.2% lead) and every Cinebench multi-core test. For single-thread performance, it leads by 9.9% in PassMark and by roughly 5% across all Cinebench single-core tests. It also wins in random string sorting (19.7%), extended instructions (3.1%), and integer math (3.4%). If your workload involves rendering, simulation, data analysis, or general productivity, the 8640HS is the stronger choice.

The Ryzen 5 PRO 5655G has a narrow, specific niche. It wins in data compression (3.6%) and data encryption (1.9%). These are the only two tests where it outperforms the 8640HS, and the margins are small. For workloads that are heavily dependent on compression algorithms (like certain backup or archival tasks) or encryption (like VPN or secure file handling), the 5655G holds a slight edge. Additionally, its higher base clock of 3.90 GHz versus 3.50 GHz could make it feel snappier in short, light tasks, though this does not show up as a benchmark win in the recorded data. The 5655G also benefits from being on the AM4 platform, which offers a wider range of motherboards and longer platform compatibility. For a desktop build where data compression or encryption is a primary task, or where AM4 is a requirement, the 5655G is the pick.

Specification Differences

The two processors differ in several key specifications. The 8640HS has a base clock of 3.50 GHz and a boost clock of 4.90 GHz, while the 5655G has a base clock of 3.90 GHz and a boost clock of 4.40 GHz. The 8640HS has a higher boost clock by 0.50 GHz, while the 5655G has a higher base clock by 0.40 GHz. The TDP differs significantly: the 8640HS is rated at 28 watts, while the 5655G is rated at 65 watts.

The process node is a major difference: 4 nm for the 8640HS versus 7 nm for the 5655G. Transistor counts are 25,000 million for the 8640HS and 10,700 million for the 5655G. Die sizes are similar at 178 mm² and 180 mm² respectively. Cache differs in L2: 1 MB per core for the 8640HS versus 512 KB per core for the 5655G, with both having 64 KB L1 per core and 16 MB L3.

Memory support is different: DDR5 for the 8640HS versus DDR4 for the 5655G, with bandwidths of 89.6 GB/s and 51.2 GB/s respectively. PCIe generation differs: Gen 4 with 20 lanes for the 8640HS versus Gen 3 with 16 lanes for the 5655G. The integrated GPU is a Radeon 760M on the 8640HS versus a Radeon Vega 7 on the 5655G. The sockets are different: AMD Socket FP7 for the 8640HS and AMD Socket AM4 for the 5655G. The 8640HS is a mobile part, while the 5655G is a desktop part. The 8640HS was released on 2024-04-15, while the 5655G was released on 2024-05-06. Both are currently active in production, and neither has an unlocked multiplier.