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AMD Ryzen 5 8645H specifications and in-depth review

AMD Ryzen 5 8645H

Manufacturer: AMD

The AMD Ryzen 5 8645H is a laptop processor designed for users who need solid performance and power efficiency. It features a base clock speed of 4.3 GHz across 6 cores, offering a balanced blend of processing power and thermals for demanding applications.

Key specifications include a 45W thermal design power (TDP) and 12 threads for multitasking. The integrated Radeon 760M GPU supports DirectX 12 and has a turbo boost clock of 2.6 GHz, while the CPU's cache is split into 6 MB L2 and 16 MB L3 for improved data handling and efficiency.

Pros
  • Supports multithreading for improved performance in multitasking scenarios.
  • Includes integrated Radeon 760M graphics with a turbo boost clock speed of 2600 MHz, suitable for light gaming and graphical tasks.
  • Supports up to 254 GB of RAM, allowing for significant memory expansion for demanding workloads.
  • Built on a 4 nm semiconductor process, offering improved power efficiency and thermal management.
Cons
  • Does not support ECC memory, which could be a limitation for certain high-reliability applications.
  • Has a fixed CPU multiplier, limiting overclocking flexibility.
  • Does not feature big.LITTLE technology, which could affect power efficiency during lighter tasks.
Who is this for?

The AMD Ryzen 5 8645H is ideal for users who require a balance of performance and efficiency in a laptop. With its 6 x 4.3 GHz CPU speed and integrated Radeon 760M graphics, it's suitable for tasks such as light gaming, media consumption, and everyday productivity. It also supports up to 254 GB of RAM, making it an excellent choice for users who need significant memory capacity for multitasking or memory-intensive applications.

Who is this NOT for?

This processor may not be the best choice for users who need advanced features such as ECC memory support or overclocking capabilities, as it lacks both. Additionally, without big.LITTLE technology, it may not offer optimal power efficiency during lighter workloads, making it less suitable for users seeking maximum battery life or energy efficiency in mobile environments.

General info:

Type Laptop
Has integrated graphics ✓
release date March 2025
Thermal Design Power (TDP) 45W
semiconductor size 4 nm
CPU temperature 100 °C
PCI Express (PCIe) version 4
Supports 64-bit ✓

The AMD Ryzen 5 8645H is a laptop processor with a 45W TDP designed for efficient thermal management. It features integrated graphics and supports PCIe 4.0, enabling fast data transfer speeds. The processor is built using a 4 nm semiconductor size and supports 64-bit computing for enhanced performance across compatible applications. Additionally, the CPU can reach temperatures up to 100°C under load.

Performance:

CPU speed 6 x 4.3 GHz
CPU threads 12 threads
turbo clock speed 5GHz
Has an unlocked multiplier ✕
L2 cache 6 MB
L3 cache 16 MB
L2 core 1 MB/core
L3 core 2.67 MB/core
Uses big.LITTLE technology ✕
clock multiplier 43

The AMD Ryzen 5 8645H offers solid performance with a base CPU speed of 6 x 4.3 GHz, supporting 12 threads for efficient multitasking. The processor features a turbo boost clock speed of up to 5 GHz and includes a 6 MB L2 cache and 16 MB L3 cache to enhance data access speeds. It operates without an unlocked multiplier and does not use big.LITTLE technology, providing a consistent performance profile for demanding applications.

Benchmarks:

Integrated graphics:

GPU clock speed 800 MHz
GPU name Radeon 760M
GPU turbo 2600 MHz
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 AMD Ryzen 5 8645H features integrated Radeon 760M graphics with a base GPU clock speed of 800 MHz, capable of boosting up to 2600 MHz for enhanced performance. It supports up to 4 displays and is compatible with DirectX 12, OpenGL 4.6, and OpenCL 2.1. The GPU also includes 32 texture mapping units and 512 shading units, providing solid graphical capabilities for various tasks.

Memory:

RAM speed (max) 7500 MHz
DDR memory version 5
memory channels 2
maximum memory amount 254GB
Supports ECC memory ✕

The AMD Ryzen 5 8645H supports a maximum RAM speed of 7500 MHz and is compatible with DDR5 memory, offering high-speed data transfer. It operates with 2 memory channels and can accommodate up to 254 GB of RAM, providing ample capacity for demanding workloads. However, it does not support ECC memory for error correction.

Features:

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

The AMD Ryzen 5 8645H supports a wide range of instruction sets including MMX, AES, AVX, and SSE 4.2, ensuring compatibility with various applications. It also features multithreading for improved performance in parallel tasks and includes an NX bit for enhanced security, preventing certain types of malware from executing.

Final Verdict

The AMD Ryzen 5 8645H is a solid choice for users who need a balanced and efficient laptop processor, offering a strong 6 x 4.3 GHz CPU speed and integrated Radeon 760M graphics for light gaming and everyday tasks. With support for up to 254 GB of RAM and robust multitasking capabilities, it excels in environments requiring both power and efficiency. However, it lacks features like ECC memory support and overclocking flexibility, making it less suited for specialized professional use. Overall, this processor is a reliable option for general productivity and moderate gaming, though it may not meet the needs of those seeking maximum power efficiency or advanced memory features.