AMD Ryzen 5 PRO 8640HS vs AMD Ryzen 7 5800X Comparison

Where Each One Wins

The benchmark split between these two AMD processors is sharply defined by workload type. The AMD Ryzen 7 5800X dominates the multi-threaded and compute-heavy categories, taking 11 of the 15 recorded head-to-head comparisons. Its wins are concentrated in integer math, floating point math, data compression, encryption, physics simulation, and prime number finding. The margin in these tests is often substantial, ranging from 17.1% in random string sorting to a massive 74.6% in prime number calculation.

The AMD Ryzen 5 PRO 8640HS, despite being a mobile chip with fewer cores, claims four wins, and they are all in single-threaded or lightly threaded workloads. It takes the Cinebench R23 single-core test, the PassMark single-thread test, and it also wins Cinebench R23 multi-core, which is a surprising result given its 6-core configuration versus the 5800X's 8 cores. The pattern suggests the 8640HS is built for responsiveness and efficiency in short, bursty tasks, while the 5800X is the brute-force workhorse for sustained parallel processing.

The database also shows overall averages: the 5800X posts an average benchmark score of 29123, while the 8640HS sits at 28478. That is a difference of roughly 2.2%, but it masks the very different distribution of strengths. The desktop chip's percentile ranking is 81 versus 80 for the mobile part, so they are effectively peers in the aggregate, but the character of their performance is almost opposite. For anyone choosing between them, the decision hinges on whether the workload is mostly single-threaded or mostly parallel.

Architecture Differences

The architectural gap between these two is generational and fundamental. The Ryzen 7 5800X uses the Zen 3 architecture, codenamed Vermeer, built on a 7 nm process at TSMC. It is a desktop part with a 105 W TDP, socketed in AM4. The Ryzen 5 PRO 8640HS uses the newer Zen 4 architecture, codenamed Hawk Point, on a 4 nm process, also from TSMC. It is a mobile part with a 28 W TDP, socketed in FP7. The process shrink from 7 nm to 4 nm is a major factor in the 8640HS's efficiency and clock speed advantage.

The transistor counts tell a dramatic story. The 5800X has 4,150 million transistors on a 74 mm² die. The 8640HS has 25,000 million transistors on a 178 mm² die. That is over six times the transistor count, which reflects not just the newer process but also the inclusion of integrated graphics and a more complex memory controller. The 8640HS includes a Radeon 760M integrated GPU, while the 5800X has no integrated graphics at all. This makes the 8640HS a complete system-on-chip, whereas the 5800X requires a discrete graphics card.

Cache configurations also differ significantly. Both have 64 KB of L1 per core, but the L2 cache is 512 KB per core on the 5800X versus 1 MB per core on the 8640HS. The L3 cache is 32 MB on the desktop chip versus 16 MB shared on the mobile chip. Memory support is another split: the 5800X uses DDR4 with a dual-channel bus and 51.2 GB/s bandwidth, while the 8640HS uses DDR5 with dual-channel and 89.6 GB/s bandwidth. Both support ECC memory. PCIe is Gen 4 with 20 lanes on both, but the 5800X's lanes are CPU-only, while the 8640HS likely shares some with its integrated GPU.

Head-to-Head Benchmarks

The largest victory for the Ryzen 7 5800X comes in the PassMark find prime numbers test, where it scores 124 versus 71, a 74.6% advantage. This is a classic integer-heavy, cache-sensitive workload, and the 5800X's larger L3 cache and extra cores crush the mobile chip. Data encryption is another big win: 21191 versus 14962, a 41.6% margin. Data compression follows at 40.2% (345414 versus 246446). Integer math shows a 36% lead (94969 versus 69839), and physics simulation is 30.8% ahead (1364 versus 1043). Multithreaded PassMark score is 29.2% higher (27732 versus 21465). Extended instructions, floating point math, and random string sorting round out the wins with margins of 27.4%, 22.4%, and 17.1% respectively.

Cinebench R15 multi-core is a 43% win for the 5800X (2608.5 versus 1824), and even R15 single-core goes to the desktop chip by a narrow 3.3% (265.5 versus 257). That is the only single-threaded test the 5800X wins, and it is a small one.

The Ryzen 5 PRO 8640HS fights back in the newer Cinebench R23 tests. In R23 multi-core, it scores 18104 against 15476, a 14.5% victory for the mobile chip. This is remarkable because the 5800X has 8 cores and 16 threads, while the 8640HS has 6 cores and 12 threads. The Zen 4 architecture's higher IPC and the DDR5 memory bandwidth overcome the core deficit. The R23 single-core test is an even bigger win: 2555 versus 1574.5, a 38.4% margin. That is a massive single-threaded advantage, nearly 1.6 times the score. PassMark single-thread also favors the 8640HS, at 3561 versus 3445, a 3.3% edge.

The data paints a clear picture: the 5800X dominates legacy and parallel workloads, while the 8640HS wins modern, short-duration, and single-threaded tasks by a wide margin in the case of R23.

Specification Differences

The two processors differ in nearly every core specification. The 5800X has 8 cores and 16 threads, while the 8640HS has 6 cores and 12 threads. Base clocks are 3.80 GHz versus 3.50 GHz, favoring the desktop chip. Boost clocks reverse the order: 4.70 GHz on the 5800X versus 4.90 GHz on the 8640HS, giving the mobile chip a 200 MHz advantage. TDP is starkly different: 105 W versus 28 W, reflecting the desktop versus mobile design goals.

Process node is 7 nm for the 5800X and 4 nm for the 8640HS. Transistor counts are 4,150 million versus 25,000 million. Die size is 74 mm² versus 178 mm². L2 cache per core is 512 KB versus 1 MB. L3 cache is 32 MB versus 16 MB. Memory support is DDR4 versus DDR5, with bandwidth of 51.2 GB/s versus 89.6 GB/s. The 5800X has no integrated graphics; the 8640HS has Radeon 760M. The 5800X has an unlocked multiplier; the 8640HS does not. Sockets are AM4 versus FP7. Release dates are November 2020 for the 5800X and April 2024 for the 8640HS. The 5800X launched with an MSRP of $449; the 8640HS has no recorded launch MSRP in the database.

FAQ

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

A: It depends on the benchmark generation. The 5800X wins Cinebench R15 multi-core by 43% and PassMark multi-thread by 29.2%. But the 8640HS wins Cinebench R23 multi-core by 14.5%, despite having fewer cores.

Q: Why does the Ryzen 5 PRO 8640HS win Cinebench R23 multi-core?

A: The 8640HS uses the newer Zen 4 architecture on a 4 nm process, with DDR5 memory at 89.6 GB/s bandwidth. It also has a higher boost clock of 4.90 GHz. These factors overcome its 2-core deficit in this specific test.

Q: Is the 5800X better for encryption and compression?

A: Yes, by large margins. The 5800X leads by 41.6% in data encryption and 40.2% in data compression, and it also wins integer math by 36%.

Q: Which chip has the better single-threaded performance?

A: The 8640HS wins PassMark single-thread by 3.3% and Cinebench R23 single-core by 38.4%. The 5800X only wins Cinebench R15 single-core by 3.3%.

Q: What is the memory bandwidth difference?

A: The 8640HS supports DDR5 with 89.6 GB/s, while the 5800X supports DDR4 with 51.2 GB/s. That is a 75% higher theoretical bandwidth for the mobile chip.

Q: Do both processors support ECC memory?

A: Yes, both list ECC memory as supported.

The Verdict

The data points to two different buyers. The AMD Ryzen 7 5800X is the choice for anyone running sustained, parallel, compute-heavy workloads. Its 11 benchmark wins include the largest margins in this comparison, especially in prime number finding (74.6% ahead), encryption (41.6%), and compression (40.2%). It is also the only one with an unlocked multiplier, making it suited for enthusiast desktop builds on AM4. Its 8 cores and 16 threads, combined with 32 MB L3 cache, deliver consistent multi-threaded performance across legacy and modern tests, even if it loses R23 multi-core.

The AMD Ryzen 5 PRO 8640HS is the pick for single-threaded performance and efficiency. Its 38.4% lead in Cinebench R23 single-core is the single largest margin in either direction. It also wins R23 multi-core despite having fewer cores, which suggests that Zen 4's architectural improvements and DDR5 bandwidth are substantial. The 28 W TDP, integrated Radeon 760M graphics, and mobile FP7 socket make it the obvious choice for a laptop or a compact, power-conscious system. The lack of an unlocked multiplier is expected for a mobile PRO part.

In short, the 5800X wins where raw parallel compute matters, and the 8640HS wins where modern single-threaded speed and efficiency matter. The recorded data shows a 1-point percentile difference (81 versus 80), but that aggregate hides the clear specialization. Choose the 5800X for a desktop workstation, choose the 8640HS for a mobile or low-power system.