TurboVS
AMD Ryzen 5 Pro 8640HS specifications and in-depth review

AMD Ryzen 5 Pro 8640HS

Manufacturer: AMD

The AMD Ryzen 5 Pro 8640HS is a mobile and desktop processor aimed at professional use cases, built on a compact 4 nm semiconductor process. It operates with a base clock speed of 6 x 3.5 GHz and can reach a turbo frequency of 4.9 GHz, supported by 12 threads for handling concurrent workloads. The chip carries a thermal design power rating of 28W, making it suited for thin systems where heat and power budgets matter.

On the memory side, the Ryzen 5 Pro 8640HS supports DDR5 RAM at speeds up to 7500 MHz, with dual-channel configuration and a maximum capacity of 256 GB, including ECC memory support. Cache is arranged across 384 KB of L1, 6 MB of L2, and 16 MB of L3. Integrated graphics come via the Radeon 760M, which runs at a base GPU clock of 800 MHz, boosting up to 2600 MHz, with 512 shading units and support for up to four simultaneous displays. The processor also includes a broad instruction set spanning AVX2, AES, FMA3, and SSE 4.2, along with full 64-bit and multithreading support.

Pros
  • Supports DDR5 memory at speeds up to 7500 MHz with dual-channel configuration, enabling substantial memory bandwidth
  • ECC memory support adds a layer of data integrity useful in professional and reliability-sensitive workloads
  • The Radeon 760M integrated graphics can drive up to four displays simultaneously without a discrete GPU
  • A maximum memory capacity of 256 GB accommodates demanding multitasking and data-heavy professional applications
  • Broad instruction set coverage including AVX2, AES, and FMA3 supports a wide range of compute and security workloads
  • PCIe 4 support allows for fast connectivity with modern storage and peripheral devices
Cons
  • The multiplier is locked, leaving no option to adjust clock speeds beyond factory settings
  • With only 8 GPU execution units, the integrated Radeon 760M has limited headroom for graphically intensive tasks
  • A base GPU clock of 800 MHz is relatively modest, which may affect sustained graphics workloads
  • The 28W TDP, while efficient, may result in thermal throttling in compact systems under sustained full load
  • No big.LITTLE heterogeneous core architecture means all cores operate under the same design, limiting flexible power scaling
Who is this for?

This processor is well-suited for professionals who need a capable mobile or desktop platform for productivity-focused workloads. Its support for ECC memory and up to 256 GB of DDR5 RAM makes it a practical fit for workstation-class tasks such as data processing, software development, and light virtualization. The Radeon 760M integrated graphics with support for up to four simultaneous displays also makes it a reasonable choice for multi-monitor office setups without requiring a discrete GPU, while the broad instruction set coverage benefits users running encryption-heavy or vectorized workloads.

Who is this NOT for?

Users looking to run graphically demanding applications such as modern 3D games or GPU-accelerated rendering will find the integrated Radeon 760M insufficient, given its limited 8 execution units and modest base clock. Similarly, enthusiasts or overclockers will be constrained by the locked multiplier, which removes any possibility of manual clock speed tuning. The 28W TDP also means that users deploying this chip in thermally restricted enclosures may encounter performance throttling under prolonged, intensive workloads.

General info:

Type Laptop, Desktop
Has integrated graphics ✓
Thermal Design Power (TDP) 28W
semiconductor size 4 nm
CPU temperature 100 °C
PCI Express (PCIe) version 4
number of transistors 25000 million
Supports 64-bit ✓

The AMD Ryzen 5 Pro 8640HS is designed for both laptop and desktop platforms, built on a 4 nm semiconductor process that houses 25,000 million transistors. It carries a Thermal Design Power (TDP) of 28W and reaches a maximum operating temperature of 100 °C. The chip includes integrated graphics, supports 64-bit computing, and connects to the system via PCIe 4, offering a solid foundation for modern peripheral and storage bandwidth needs.

Performance:

CPU speed 6 x 3.5 GHz
CPU threads 12 threads
turbo clock speed 4.9GHz
Has an unlocked multiplier ✕
L2 cache 6 MB
L3 cache 16 MB
L1 cache 384 KB
L2 core 1 MB/core
L3 core 2.67 MB/core
Uses big.LITTLE technology ✕
clock multiplier 35

The processor runs six cores at a base speed of 3.5 GHz each, supporting 12 threads in total, and can reach a turbo clock speed of 4.9 GHz under load, with a fixed clock multiplier of 35. It does not feature an unlocked multiplier or big.LITTLE heterogeneous core architecture. Cache memory is organized across three levels: 384 KB of L1, 6 MB of L2 at 1 MB per core, and 16 MB of L3 at 2.67 MB per core, providing a tiered structure to help reduce latency during data-intensive tasks.

Benchmarks:

PassMark result 21299
PassMark result (single) 3598

In PassMark testing, the processor achieves a multi-threaded score of 21,299, reflecting its overall throughput across all cores and threads. Its single-threaded PassMark result stands at 3,598, indicating the per-core processing capability measured under a single-thread workload.

Integrated graphics:

GPU clock speed 800 MHz
GPU name Radeon 760M
GPU turbo 2600 MHz
GPU execution units 8
DirectX version DirectX 12
supported displays 4
OpenGL version 4.6
OpenCL version 2.1
texture mapping units (TMUs) 32
render output units (ROPs) 16
shading units 512

The integrated Radeon 760M GPU operates at a base clock of 800 MHz and can boost up to 2600 MHz, backed by 8 execution units, 512 shading units, 32 texture mapping units, and 16 render output units. It supports up to four displays simultaneously and is compatible with DirectX 12, OpenGL 4.6, and OpenCL 2.1, covering a broad range of graphics and compute workloads handled directly by the processor.

Memory:

RAM speed (max) 7500 MHz
DDR memory version 5
memory channels 2
maximum memory amount 256GB
Supports ECC memory ✓

The processor supports DDR5 memory at speeds up to 7500 MHz across a dual-channel configuration, allowing for balanced bandwidth across both channels. It can address up to 256 GB of RAM in total, and also supports ECC memory, which enables error detection and correction at the hardware level.

Features:

instruction sets MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, SSE 4.2
uses multithreading ✓
Has NX bit ✓

The processor includes multithreading support and an NX bit for hardware-level memory protection against certain code execution exploits. Its instruction set coverage spans MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2, providing a wide range of capabilities for tasks involving floating-point math, encryption, and vectorized data processing.

Final Verdict

The AMD Ryzen 5 Pro 8640HS is a well-rounded processor built for professional mobile and desktop environments where reliability and memory capability take priority. Its DDR5 support with ECC compatibility and a maximum capacity of 256 GB positions it firmly in productivity-oriented territory, while the Radeon 760M integrated graphics offer enough versatility for multi-display office use without the need for additional hardware. Users who require overclocking headroom or dedicated graphics performance will find it falls outside this chip's intended scope, but for workloads centered around data integrity, multithreaded processing, and broad instruction set coverage, it delivers a coherent and purposeful specification set that aligns well with its Pro-class designation.

Popular Comparisons

AMD Ryzen 5 Pro 8640HS
AMD Ryzen 5 Pro 8640HS
VS
Intel Core Ultra 5 125H
Intel Core Ultra 5 125H
AMD Ryzen 5 Pro 8640HS
AMD Ryzen 5 Pro 8640HS
VS
Intel Core Ultra 7 155H
Intel Core Ultra 7 155H
AMD Ryzen 5 Pro 8640HS
AMD Ryzen 5 Pro 8640HS
VS
AMD Ryzen AI 7 Pro 360
AMD Ryzen AI 7 Pro 360