AMD Ryzen 5 8640HS

The AMD Ryzen 5 8640HS sits in the upper tier of mobile processors, placing in the 81st percentile of all CPUs tracked. Its average benchmark score of 24150 places it in a tight cluster of competitors, with the nearest rivals all falling within a 1% delta of its performance. This positioning indicates a highly competitive mid-range mobile chip where the margin between contenders is razor-thin.

Benchmark Performance

The benchmark data reveals a processor that delivers consistent, well-rounded performance across both synthetic and application-based tests. In Cinebench R23, the 8640HS scores 16905 points in multi-core and 2386 points in single-core. This multi-core result represents a substantial capability for a 28-watt mobile part, indicating strong sustained throughput for demanding workloads.

Looking at the Geekbench results, the processor achieves 8123 in multi-core and 2134 in single-core. The ratio between these scores, roughly 3.8:1, reflects a balanced design where the six cores with twelve threads scale effectively under parallel loads. The single-core performance of 2134 places it in a range suitable for responsive everyday computing and lightly-threaded applications.

The PassMark suite provides additional insight into specialized workloads. The integer math score of 68173 and floating-point math score of 39725 show strong arithmetic processing capabilities. Data encryption scores 13551, while data compression reaches 226544, suggesting efficient handling of these specific tasks. Extended instructions score 15855, indicating solid SIMD and vector processing performance. The physics score of 970 and find prime numbers score of 70 are more modest, which is typical for a mobile processor with a 28-watt power envelope.

Relative to its nearest rivals, the 8640HS shows a negligible performance gap. It trails the Intel Core Ultra 7 268V by exactly 0% in average score, with a difference of only 7 points (24150 vs 24157). The AMD Ryzen 7 7840U is 0.2% ahead, scoring 24194. The AMD Ryzen 5 8600G sits 0.3% behind at 24089, and the AMD Ryzen 5 8540U is 1% behind at 23918. These deltas are within run-to-run variance for most benchmarks, meaning real-world differences between these processors are essentially imperceptible.

How It Compares

Intel Core Ultra 7 268V: The 8640HS and the Core Ultra 7 268V are statistically tied, with the Intel part holding a 0% delta advantage. Both processors deliver nearly identical average scores, making the choice between them dependent on platform features rather than raw performance. The 268V may offer different integrated graphics or platform capabilities, but in pure CPU throughput, the 8640HS matches it.

AMD Ryzen 7 7840U: The Ryzen 7 7840U holds a slight 0.2% edge over the 8640HS. This is a marginal difference, and the 7840U achieves this with a different core configuration. The 8640HS compensates with its newer Zen 4 architecture and higher boost clock of 4.90 GHz, which helps close the gap against a chip that might otherwise be expected to outperform it given the higher tier in its model name.

AMD Ryzen 5 8600G: The 8640HS actually leads the 8600G by 0.3%, which is notable because the 8600G is a desktop-class processor. This suggests the mobile 8640HS does not sacrifice much performance despite its lower power envelope. The 4.90 GHz boost clock likely plays a significant role in keeping the 8640HS competitive against a part that has more thermal headroom available.

AMD Ryzen 5 8540U: The 8640HS leads the 8540U by a full 1%, the largest margin among its nearest rivals. This is a meaningful difference, indicating that the 8640HS offers a clear performance uplift over its lower-tier sibling. The higher boost clock and potentially better binning contribute to this advantage, making the 8640HS the stronger choice for users who want the extra headroom.

Single-Thread vs Multi-Thread Behavior

The single-thread scores across all benchmarks are consistently strong for a mobile processor. In Cinebench R23 single-core, the 8640HS scores 2386, which is only about 14% lower than its multi-core score of 16905 when normalized per-core. This indicates that the processor does not rely heavily on multi-threading to achieve its performance — each individual core is capable of high throughput on its own.

This balanced behavior is reflected in the PassMark single-thread score of 3584, which is strong for a 28-watt part. The Geekbench single-core score of 2134 further confirms this. For real-world workloads, this means the 8640HS will feel responsive in everyday tasks like web browsing, document editing, and light productivity applications, where single-thread performance dominates.

The multi-thread scaling is also efficient. The multi-core scores scale well from the single-core results, indicating that the twelve threads are effectively utilized. The Cinebench R20 multi-core score of 7100 and single-core of 1002 show a scaling factor of roughly 7:1, which is reasonable for six physical cores with simultaneous multi-threading. Workloads like video encoding, 3D rendering, and software compilation will benefit from this scaling, though the 28-watt power limit means sustained all-core loads may see some thermal throttling in thin-and-light chassis.

The data suggests a processor that is equally comfortable with lightly-threaded interactive tasks and heavily-parallel compute tasks. Users will not need to compromise — the 8640HS handles both ends of the spectrum competently, making it a versatile choice for a wide range of laptop usage patterns.

FAQ

Q: How does the Ryzen 5 8640HS compare to the Intel Core Ultra 7 268V?

A: The two processors are effectively tied, with the Core Ultra 7 268V holding a 0% delta advantage. The average benchmark scores are 24150 for the 8640HS and 24157 for the 268V, a difference of only 7 points.

Q: What is the multi-core performance of the 8640HS in Cinebench R23?

A: The processor scores 16905 points in Cinebench R23 multi-core, which places it in the 81st percentile of all CPUs and within 1% of its nearest rivals.

Q: Does the 8640HS support DDR4 memory?

A: No, the 8640HS supports only DDR5 memory with a dual-channel bus, providing 89.6 GB/s of memory bandwidth.

Q: What is the boost clock speed of the Ryzen 5 8640HS?

A: The maximum boost clock is 4.90 GHz, with a base clock of 3.50 GHz.

Q: How does the 8640HS perform in data encryption tasks?

A: The PassMark data encryption score is 13551, which is a moderate result that indicates adequate AES and encryption performance for a mobile processor.

Q: Is the Ryzen 5 8640HS an unlocked processor for overclocking?

A: No, the multiplier is locked, so the processor cannot be overclocked through conventional means.

Who Should Consider It

The Ryzen 5 8640HS is well-suited for users who need a balanced mobile processor that can handle both productivity and creative workloads without excessive power consumption. The 81st percentile ranking indicates that it outperforms the majority of CPUs in the database, making it a strong choice for a premium ultrabook or light workstation laptop.

For gaming, the 8640HS offers solid CPU performance that will not bottleneck most discrete GPUs. The single-thread score of 3584 in PassMark and 2386 in Cinebench R23 single-core ensure that game logic and physics calculations are handled smoothly. The integrated Radeon 760M graphics provide a capable fallback for light gaming without a discrete GPU, though the CPU-focused benchmark data does not directly measure graphics performance.

For content creation, the multi-core scores are the relevant metric. The Cinebench R23 multi-core score of 16905 and Geekbench multi-core score of 8123 indicate that video editing, 3D rendering, and photo processing tasks will complete reasonably quickly. The PassMark floating-point math score of 39725 suggests strong performance in scientific and engineering applications that rely on floating-point calculations.

For office and productivity work, the 8640HS is more than sufficient. The single-thread performance ensures snappy application launches and responsive multitasking. The data compression score of 226544 indicates efficient file archiving and extraction. The 28-watt TDP also makes it suitable for thin-and-light laptops where battery life is a priority, as it will not drain the battery as quickly as higher-power parts.

Users who frequently work with encrypted data or security-sensitive applications will appreciate the data encryption score of 13551. The extended instructions score of 15855 also indicates good support for modern SIMD instructions, which benefits workloads like audio processing and data analysis.

Platform and Compatibility

The Ryzen 5 8640HS uses the AMD Socket FP8 and is built on the Zen 4 architecture with the Hawk Point codename. It is manufactured on a 4 nm process at TSMC, with 25,000 million transistors on a 178 mm² die. This is an active production part, released on December 5, 2023, as part of the 8000 series.

Memory support is limited to DDR5 with a dual-channel configuration, providing 89.6 GB/s of bandwidth. ECC memory is not supported. The processor offers PCIe Gen 4 with 20 lanes from the CPU, which is sufficient for a modern mobile GPU and one or two NVMe SSDs.

The integrated graphics are provided by the Radeon 760M, which is based on the same Zen 4 platform. This iGPU is suitable for general display output and light graphics tasks, though users requiring high-end gaming performance would need a discrete GPU.

The upgrade path for the 8640HS is limited by its mobile form factor. Since it is soldered to the motherboard in most laptops, users cannot swap it for a different processor. However, the FP8 socket is shared with other AMD mobile processors, so system integrators have flexibility in configuring laptops with different CPU options. The 8640HS sits in the middle of the 8000 series lineup, with the Ryzen 5 8540U as a lower-tier option and the Ryzen 7 7840U as a higher-tier alternative.

The processor is not overclockable, as the multiplier is locked. This is standard for mobile processors, where power and thermal constraints are more important than maximum clock speed. Users should instead rely on the boost clock of 4.90 GHz for peak performance when needed. The part numbers include 100-000001373 (FP7r2), 100-000001380 (FP7), and 100-000001358 (FP8), indicating compatibility with different socket variants within the same family.