TurboVS
AMD Ryzen 7 8745HX
AMD Ryzen 7 H 255

AMD Ryzen 7 8745HX AMD Ryzen 7 H 255

Common Features

  • ✓ Both products are designed for laptop and desktop use.
  • ✓ Both products have integrated graphics.
  • ✓ Both products support 64-bit processing.
  • ✓ Both products have a maximum CPU temperature of 100 °C.
  • ✓ Both products support DirectX 12.
  • ✓ Both products support up to 4 displays.
  • ✓ Both products support OpenGL 4.6.
  • ✓ Both products support OpenCL 2.1.
  • ✓ Both products have 16 CPU threads.
  • ✓ Both products have 8 MB of L2 cache.
  • ✓ Both products have 1 MB of L2 cache per core.
  • ✓ Both products do not use big.LITTLE technology.
  • ✓ Both products have 32 MB of L3 cache in total.
  • ✓ Both products have 4 MB of L3 cache per core.
  • ✓ Both products have MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2 instruction sets.
  • ✓ Both products support multithreading.
  • ✓ Both products have the NX bit.
  • ✓ Both products use DDR5 memory.
  • ✓ Both products have 2 memory channels.
  • ✓ Neither product supports ECC memory.

Main Differences

  • • Thermal Design Power (TDP) is 55W on AMD Ryzen 7 8745HX and 45W on AMD Ryzen 7 H 255.
  • • Semiconductor size is 5 nm on AMD Ryzen 7 8745HX and 4 nm on AMD Ryzen 7 H 255.
  • • PCI Express (PCIe) version is 5 on AMD Ryzen 7 8745HX and 4 on AMD Ryzen 7 H 255.
  • • CPU speed is 8 x 3.6 GHz on AMD Ryzen 7 8745HX and 8 x 3.8 GHz on AMD Ryzen 7 H 255.
  • • Turbo clock speed is 5.1 GHz on AMD Ryzen 7 8745HX and 4.9 GHz on AMD Ryzen 7 H 255.
  • • AMD Ryzen 7 8745HX has an unlocked multiplier, while AMD Ryzen 7 H 255 does not.
  • • L3 cache is 32 MB on AMD Ryzen 7 8745HX and 16 MB on AMD Ryzen 7 H 255.
  • • L3 core is 4 MB on AMD Ryzen 7 8745HX and 2 MB on AMD Ryzen 7 H 255.
  • • Clock multiplier is 36 on AMD Ryzen 7 8745HX and 38 on AMD Ryzen 7 H 255.
  • • GPU clock speed is 400 MHz on AMD Ryzen 7 8745HX and 800 MHz on AMD Ryzen 7 H 255.
  • • GPU name is Radeon 610M on AMD Ryzen 7 8745HX and Radeon 780M on AMD Ryzen 7 H 255.
  • • GPU turbo is 2200 MHz on AMD Ryzen 7 8745HX and 2600 MHz on AMD Ryzen 7 H 255.
  • • Texture mapping units (TMUs) are 8 on AMD Ryzen 7 8745HX and 48 on AMD Ryzen 7 H 255.
  • • Render output units (ROPs) are 4 on AMD Ryzen 7 8745HX and 32 on AMD Ryzen 7 H 255.
  • • Shading units are 128 on AMD Ryzen 7 8745HX and 768 on AMD Ryzen 7 H 255.
  • • RAM speed (max) is 5200 MHz on AMD Ryzen 7 8745HX and 7500 MHz on AMD Ryzen 7 H 255.
  • • Maximum memory amount is 64GB on AMD Ryzen 7 8745HX and 256GB on AMD Ryzen 7 H 255.
Specs Comparison
AMD Ryzen 7 8745HX

AMD Ryzen 7 8745HX

AMD Ryzen 7 H 255

AMD Ryzen 7 H 255

General info:
Type Laptop, Desktop Laptop, Desktop
Has integrated graphics ✓ ✓
release date April 2025 August 2025
Thermal Design Power (TDP) 55W 45W
semiconductor size 5 nm 4 nm
CPU temperature 100 °C 100 °C
PCI Express (PCIe) version 5 4
Supports 64-bit ✓ ✓

Both the AMD Ryzen 7 8745HX and the AMD Ryzen 7 H 255 are designed for laptops and desktops, and both feature integrated graphics. They also support 64-bit architecture, which is common for modern processors.

The AMD Ryzen 7 8745HX has a Thermal Design Power (TDP) of 55W, while the Ryzen 7 H 255 has a lower TDP of 45W. This means the 8745HX may have a higher power consumption and thermal output compared to the H 255. The 8745HX is built on a 5 nm semiconductor, whereas the H 255 uses a smaller 4 nm semiconductor, potentially offering advantages in efficiency or performance.

In terms of PCIe version, the Ryzen 7 8745HX supports PCIe 5, which is faster than the PCIe 4 support found on the Ryzen 7 H 255. Finally, both processors have a CPU temperature of 100 °C, indicating that they may operate at similar thermal limits under load.

Performance:
CPU speed 8 x 3.6 GHz 8 x 3.8 GHz
CPU threads 16 threads 16 threads
turbo clock speed 5.1GHz 4.9GHz
Has an unlocked multiplier ✓ ✕
L2 cache 8 MB 8 MB
L3 cache 32 MB 16 MB
L2 core 1 MB/core 1 MB/core
L3 core 4 MB/core 2 MB/core
Uses big.LITTLE technology ✕ ✕
clock multiplier 36 38

The AMD Ryzen 7 8745HX and the AMD Ryzen 7 H 255 are both equipped with 8 cores and 16 threads. However, their base CPU speeds differ slightly, with the 8745HX running at 3.6 GHz per core, while the H 255 operates at 3.8 GHz per core.

When it comes to turbo clock speed, the Ryzen 7 8745HX has a slightly higher maximum boost at 5.1 GHz compared to the H 255′s 4.9 GHz. The 8745HX also has an unlocked multiplier, allowing for overclocking, whereas the Ryzen 7 H 255 does not have this feature.

Both processors have the same 8 MB of L2 cache per processor, but the Ryzen 7 8745HX offers significantly more L3 cache, with 32 MB compared to the 16 MB in the H 255. The L3 cache in the 8745HX is also split more evenly across its cores, with 4 MB per core, while the H 255 has only 2 MB per core. Neither processor uses big.LITTLE technology, and both have a clock multiplier of 36 (8745HX) and 38 (H 255).

Integrated graphics:
GPU clock speed 400 MHz 800 MHz
GPU name Radeon 610M Radeon 780M
GPU turbo 2200 MHz 2600 MHz
DirectX version DirectX 12 DirectX 12
supported displays 4 4
OpenGL version 4.6 4.6
OpenCL version 2.1 2.1
texture mapping units (TMUs) 8 48
render output units (ROPs) 4 32
shading units 128 768

The AMD Ryzen 7 8745HX and AMD Ryzen 7 H 255 both feature integrated Radeon graphics. The 8745HX is equipped with the Radeon 610M, which has a GPU clock speed of 400 MHz and can boost up to 2200 MHz. In contrast, the Ryzen 7 H 255 uses the more powerful Radeon 780M, with a GPU clock speed of 800 MHz and a turbo boost of 2600 MHz.

Both processors support DirectX 12, OpenGL 4.6, and OpenCL 2.1, ensuring compatibility with a wide range of applications. They also each support up to four displays. However, the 780M in the Ryzen 7 H 255 is significantly more powerful in terms of hardware specifications. It features 48 texture mapping units (TMUs), 32 render output units (ROPs), and 768 shading units. In comparison, the 610M in the 8745HX has only 8 TMUs, 4 ROPs, and 128 shading units.

Overall, the Ryzen 7 H 255's Radeon 780M offers much more robust integrated graphics compared to the 610M found in the Ryzen 7 8745HX.

Memory:
RAM speed (max) 5200 MHz 7500 MHz
DDR memory version 5 5
memory channels 2 2
maximum memory amount 64GB 256GB
Supports ECC memory ✕ ✕

Both the AMD Ryzen 7 8745HX and AMD Ryzen 7 H 255 support DDR5 memory and feature two memory channels. However, there are notable differences in their memory capabilities. The 8745HX supports a maximum RAM speed of 5200 MHz, while the H 255 offers a higher maximum RAM speed of 7500 MHz.

When it comes to memory capacity, the Ryzen 7 8745HX can support up to 64 GB of memory, while the Ryzen 7 H 255 has a significantly higher maximum of 256 GB. Both processors do not support ECC (Error-Correcting Code) memory.

In summary, the Ryzen 7 H 255 offers faster memory speeds and much higher memory capacity than the Ryzen 7 8745HX, though both share the same DDR5 version and memory channel configuration.

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

The AMD Ryzen 7 8745HX and the AMD Ryzen 7 H 255 share identical features when it comes to instruction sets, multithreading support, and security features. Both processors support a range of instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2.

Both processors also utilize multithreading, allowing them to handle multiple tasks simultaneously for improved performance. Additionally, both have the NX bit enabled, providing protection against certain types of malicious software.

As a result, in terms of features, the two processors are equivalent, with no differences between them in the listed specifications.

Comparison Summary

This is a specification comparison between AMD Ryzen 7 8745HX and AMD Ryzen 7 H 255. Both products are designed for laptops and desktops, feature integrated graphics, and support 64-bit processing. However, they differ in several key areas, such as Thermal Design Power (TDP), with the 8745HX at 55W and the H 255 at 45W. The semiconductor size is 5 nm for the 8745HX and 4 nm for the H 255. The turbo clock speed is 5.1 GHz on the 8745HX compared to 4.9 GHz on the H 255. Additionally, the L3 cache is 32 MB on the 8745HX, while it is only 16 MB on the H 255.