AMD Ryzen 5 PRO 8640HS

The AMD Ryzen 5 PRO 8640HS is a mobile processor built on the Zen 4 architecture, codenamed Hawk Point, and manufactured on a 4 nm process by TSMC. It features 6 cores and 12 threads, with a base clock of 3.50 GHz and a boost clock of 4.90 GHz. The chip integrates Radeon 760M graphics and is positioned for professional laptops, with an average benchmark score of 28470, placing it in the 85th percentile of all CPUs.

Who Should Consider It

The benchmark results suggest this processor is a versatile choice for a broad range of mobile workloads, but it is particularly well-suited for users who need strong multi-threaded performance in a power-efficient package. With a Cinebench R23 multi-core score of 18104 and a Passmark multithread score of 21299, the 8640HS handles demanding creation tasks like video rendering, 3D modeling, and software compilation with ease. The data shows it is essentially tied with the AMD Ryzen 7 7840HS, which has an average score of 28453, just 0.1% lower, meaning users can expect similar performance to a higher-tier chip in the same generation.

For gaming, the integrated Radeon 760M graphics, combined with the strong single-thread score of 2555 in Cinebench R23, indicates this can handle esports and lighter titles without a discrete GPU. The Passmark single-thread score of 3598 is competitive, and the floating-point math score of 43013 suggests solid physics and simulation performance. However, for AAA gaming at high settings, the data implies a dedicated graphics card would still be necessary, as the iGPU is not a substitute for high-end discrete solutions.

Office and productivity users will find the 8640HS more than adequate. The Passmark integer math score of 70050 and data compression score of 246947 point to snappy responsiveness in spreadsheets, databases, and general multitasking. The 28-watt TDP class makes it an excellent fit for thin-and-light laptops where battery life and thermals are priorities, yet the 12 threads ensure that background tasks do not bog down the system. This is a processor for professionals who need a balance of compute power and portability, not for those seeking extreme multi-socket workstation performance.

Power and Thermals

The 8640HS has a TDP of 28 watts, which classifies it as a low-power mobile part. This TDP figure is the thermal design power that cooling solutions must dissipate, and it indicates that a capable air cooler or a modest thin-and-light cooling solution will suffice. The data does not include specific wattage figures for different power states, but the 28 W TDP suggests sustained performance in multi-threaded tasks will be limited by the laptop's cooling design.

Given the 4 nm process node from TSMC, the chip is relatively efficient, but the 25,000 million transistors on a 178 mm² die size mean heat density is a consideration. Benchmark results, such as the Passmark physics score of 1008, are strong for the power class, implying the chip can boost to 4.90 GHz when thermal headroom allows. For users, this means a laptop with a decent vapor chamber or dual-fan setup will allow the processor to maintain high clocks, while ultra-thin designs may see reduced multi-core performance over time due to thermal throttling.

Platform and Compatibility

The processor uses the AMD Socket FP7, with part numbers 100-000001354 (FP7r2) and 100-000001382 (FP7), indicating it fits into standard mobile platforms. It supports dual-channel DDR5 memory with a bandwidth of 89.6 GB/s and includes ECC memory support, which is a notable feature for professional workstations that require error correction. The memory bus is dual-channel, and the data shows no support for DDR4, so users must plan for DDR5 modules.

For expansion, the CPU provides PCIe Gen 4 with 20 lanes from the CPU only. This allows for a discrete GPU and one or two NVMe SSDs, though the exact lane allocation is not specified. The integrated graphics, Radeon 760M, is always present, which is useful for troubleshooting or power-saving modes. The production status is active, meaning new laptops with this chip are still being made, but the socket is mobile-specific, so there is no upgrade path to a different desktop or server platform. The chip is not multiplier unlocked, so overclocking is not supported.

How It Compares

AMD Ryzen 7 7840HS: The 8640HS is virtually identical in performance to this higher-tier chip, with the Ryzen 7 7840HS scoring 28453, a delta of only 0.1% higher. The data shows the 6-core 8640HS matches the 8-core 7840HS in average benchmark scores, which suggests the 8640HS achieves better per-core efficiency or higher sustained clocks in the tested workloads. This makes the 8640HS a compelling choice when the two are priced similarly, though the Ryzen 7 may have more headroom in heavily threaded tasks beyond the tested suite.

Intel Xeon E-2436: The Xeon E-2436 scores 28536, which is 0.2% higher than the 8640HS. This is a negligible difference in average score, but the Xeon targets servers and workstations, while the 8640HS is for mobile. The 8640HS offers integrated graphics and a lower TDP, making it more suitable for laptops, while the Xeon may require a discrete GPU and more power. The performance parity is notable given the different market segments.

Intel Core i5-14400T: The Core i5-14400T scores 28537, also 0.2% higher. This desktop processor has a higher base power envelope, but the 8640HS matches it in average score. The i5-14400T is a desktop part, so the comparison is not direct, but it shows the 8640HS is competitive with mid-range desktop chips in multi-threaded tasks. The 8640HS's advantage is its mobility and lower power draw, while the i5 may excel in sustained workloads with better cooling.

AMD Ryzen 7 PRO 6850HS: This older PRO chip scores 28549, 0.3% higher than the 8640HS. The Ryzen 7 PRO 6850HS is based on the Zen 3+ architecture, and the data shows it slightly outperforms the newer Zen 4 chip in average benchmarks. This is surprising, but it may reflect differences in test conditions or power limits. The 8640HS has a newer architecture, which may offer better features like the Radeon 760M graphics and DDR5 support, but the raw compute scores are nearly identical.

Single-Thread vs Multi-Thread Behavior

The 8640HS shows a balanced profile between single-thread and multi-thread performance. Its Cinebench R23 single-core score of 2555 and multi-core score of 18104 yield a ratio of about 7.1, which is typical for a 6-core/12-thread processor. The Passmark single-thread score of 3598 and multithread score of 21299 show a similar ratio, indicating the chip scales well with additional threads without sacrificing single-core efficiency.

For real workloads, this means tasks that rely on single-thread performance, such as web browsing, office applications, and light gaming, will feel responsive due to the high boost clock of 4.90 GHz. The Passmark data compression score of 246947 and integer math score of 70050 are strong indicators of multi-threaded efficiency, making the chip well-suited for video encoding, batch image processing, and compiling code. The divide between single and multi-thread scores is modest, implying that the processor does not over-index on one type of workload, making it a generalist that handles mixed usage patterns well. Users who primarily run single-threaded apps will see excellent performance, while those who can leverage all 12 threads will get near-linear scaling.

FAQ

Q: Does the AMD Ryzen 5 PRO 8640HS support ECC memory?

A: Yes, the processor has ECC memory support, which is a feature typically found in professional workstations.

Q: What is the memory bandwidth of this processor?

A: The chip supports dual-channel DDR5 memory with a bandwidth of 89.6 GB/s.

Q: How does the 8640HS compare to the AMD Ryzen 7 7840HS?

A: The Ryzen 7 7840HS has an average benchmark score of 28453, which is 0.1% higher than the 8640HS's 28470, making them effectively equal in performance.

Q: What integrated graphics does the 8640HS include?

A: The processor integrates a Radeon 760M GPU, which is capable of handling light gaming and graphics tasks without a discrete card.

Q: Is the processor overclockable?

A: No, the multiplier is not unlocked, so overclocking is not supported.

Q: What socket does the 8640HS use?

A: It uses AMD Socket FP7, with two part numbers for different FP7 revisions.

Benchmark Performance

The average benchmark score for the 8640HS is 28470, placing it in the 85th percentile of all CPUs. This is a strong showing for a mobile 28-watt part. The closest rival is the AMD Ryzen 7 7840HS, which scores 28453, a delta of 0.1% lower. This means the 6-core 8640HS essentially matches the 8-core Ryzen 7 in the tested benchmarks, which is a significant result. The data suggests that the 8640HS has excellent performance per core, or that the Ryzen 7 7840HS is power-limited in mobile implementations.

Compared to the Intel Xeon E-2436, the 8640HS is 0.2% slower, with the Xeon scoring 28536. This is a negligible difference, but the Xeon is a server part, so the 8640HS's comparable performance in a mobile form factor is noteworthy. Similarly, the Intel Core i5-14400T scores 28537, 0.2% higher, showing that the 8640HS competes with desktop-class silicon in multi-threaded tasks, despite its lower TDP. The AMD Ryzen 7 PRO 6850HS scores 28549, 0.3% higher, which is the largest gap among the rivals, but still within a small margin.

Looking at specific tests, the Cinebench R23 multi-core score of 18104 is strong for a 28-watt part. The Passmark multithread score of 21299 corroborates this, and the data encryption score of 14870 and extended instructions score of 18279 indicate strong performance in security and vectorized workloads. The single-thread scores are also competitive, with the Cinebench R20 single-core score of 1073 and Passmark single-thread score of 3598, showing that the chip does not sacrifice single-core speed for multi-core efficiency. The overall picture is a processor that punches above its weight class, delivering performance that rivals higher-tier parts while maintaining a low power envelope.