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AMD Ryzen 9 8945HX
AMD Ryzen 9 9955HX

AMD Ryzen 9 8945HX AMD Ryzen 9 9955HX

Overview

Welcome to our in-depth spec comparison between the AMD Ryzen 9 8945HX and the AMD Ryzen 9 9955HX. Both are high-performance processors sharing the same core count, TDP, and integrated Radeon 610M graphics, yet they differ in meaningful ways. From manufacturing process and benchmark scores to memory support and GPU clock speeds, this comparison breaks down exactly where these two chips converge and where they diverge.

Common Features

  • ✓ Both processors feature integrated graphics.
  • ✓ Both have a Thermal Design Power (TDP) of 55W.
  • ✓ The maximum CPU temperature is 100 °C on both processors.
  • ✓ Both support PCI Express (PCIe) version 5.
  • ✓ Both processors support 64-bit computing.
  • ✓ Both have a base CPU speed of 16 x 2.5 GHz.
  • ✓ Both processors have 32 CPU threads.
  • ✓ Both reach a turbo clock speed of 5.4 GHz.
  • ✓ Both have an L2 cache of 16 MB.
  • ✓ Both have an L3 cache of 64 MB.
  • ✓ Both offer 1 MB of L2 cache per core.
  • ✓ Both offer 4 MB of L3 cache per core.
  • ✓ Neither processor uses big.LITTLE technology.
  • ✓ Both feature the Radeon 610M as their integrated GPU.
  • ✓ Both GPUs reach a turbo speed of 2200 MHz.
  • ✓ Both GPUs support up to 4 displays.
  • ✓ Both GPUs support OpenGL version 4.6.
  • ✓ Both GPUs have 8 texture mapping units (TMUs).
  • ✓ Both GPUs have 4 render output units (ROPs).
  • ✓ Both GPUs have 128 shading units.
  • ✓ Both processors use DDR5 memory.
  • ✓ Both processors have 2 memory channels.
  • ✓ Neither processor supports ECC memory.
  • ✓ Both support the same instruction sets: MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2.
  • ✓ Both processors use multithreading.
  • ✓ Both processors have the NX bit feature.

Main Differences

  • • The semiconductor size is 5 nm on the AMD Ryzen 9 8945HX and 4 nm on the AMD Ryzen 9 9955HX.
  • • The unlocked multiplier is available on the AMD Ryzen 9 8945HX but not on the AMD Ryzen 9 9955HX.
  • • The L1 cache is 1024 KB on the AMD Ryzen 9 8945HX and 1280 KB on the AMD Ryzen 9 9955HX.
  • • The clock multiplier is 24 on the AMD Ryzen 9 8945HX and 25 on the AMD Ryzen 9 9955HX.
  • • The PassMark result is 53181 on the AMD Ryzen 9 8945HX and 57540 on the AMD Ryzen 9 9955HX.
  • • The PassMark single-core result is 3980 on the AMD Ryzen 9 8945HX and 4452 on the AMD Ryzen 9 9955HX.
  • • The integrated GPU base clock speed is 400 MHz on the AMD Ryzen 9 8945HX and 1500 MHz on the AMD Ryzen 9 9955HX.
  • • The DirectX version is DirectX 12 Ultimate on the AMD Ryzen 9 8945HX and DirectX 12 on the AMD Ryzen 9 9955HX.
  • • The OpenCL version is 2.1 on the AMD Ryzen 9 8945HX and 2.0 on the AMD Ryzen 9 9955HX.
  • • The maximum RAM speed is 5200 MHz on the AMD Ryzen 9 8945HX and 5600 MHz on the AMD Ryzen 9 9955HX.
  • • The maximum memory amount is 64 GB on the AMD Ryzen 9 8945HX and 96 GB on the AMD Ryzen 9 9955HX.
Specs Comparison
AMD Ryzen 9 8945HX

AMD Ryzen 9 8945HX

AMD Ryzen 9 9955HX

AMD Ryzen 9 9955HX

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

At a high level, the Ryzen 9 8945HX and Ryzen 9 9955HX share a remarkably similar general profile: both are designed for laptop and desktop form factors, both carry a 55W TDP, both include integrated graphics, and both support PCIe 5 and 64-bit computing. For users comparing these chips on broad compatibility or power envelope alone, they are effectively tied.

The one meaningful differentiator in this group is the manufacturing process node. The 8945HX is built on a 5 nm process, while the 9955HX steps down to 4 nm. A smaller node generally allows for improved transistor density, which can translate to better power efficiency or more headroom for performance at the same thermal budget. Given that both chips share the same 55W TDP, the 9955HX′s finer process could theoretically extract more performance per watt — though the real-world impact of that single nanometer difference depends heavily on microarchitecture and implementation, which falls outside this spec group.

Based strictly on the general info specs, the 9955HX holds a narrow edge due to its more advanced 4 nm fabrication process. Everything else in this category is identical between the two, so the node advantage is the sole differentiator here.

Performance:
CPU speed 16 x 2.5 GHz 16 x 2.5 GHz
CPU threads 32 threads 32 threads
turbo clock speed 5.4GHz 5.4GHz
Has an unlocked multiplier ✓ ✕
L2 cache 16 MB 16 MB
L3 cache 64 MB 64 MB
L1 cache 1024 KB 1280 KB
L2 core 1 MB/core 1 MB/core
L3 core 4 MB/core 4 MB/core
Uses big.LITTLE technology ✕ ✕
clock multiplier 24 25

The AMD Ryzen 9 8945HX and AMD Ryzen 9 9955HX share several similar performance specifications. Both processors feature a CPU speed of 16 x 2.5 GHz, with 32 threads, and they can reach a turbo clock speed of 5.4 GHz. The L2 cache is 16 MB in both products, with each core having 1 MB of L2 cache. Similarly, both processors have 64 MB of L3 cache, with 4 MB of L3 cache per core.

One key difference between the two is that the Ryzen 9 8945HX has an unlocked multiplier, allowing for more flexibility in overclocking, whereas the Ryzen 9 9955HX has a locked multiplier, restricting overclocking possibilities. The Ryzen 9 9955HX also has a slightly larger L1 cache of 1280 KB, compared to the Ryzen 9 8945HX's 1024 KB.

Another distinction is that the Ryzen 9 8945HX uses a clock multiplier of 24, while the Ryzen 9 9955HX uses a multiplier of 25. Both processors do not use big.LITTLE technology, which means they are likely to operate with uniform performance across all cores.

Benchmarks:
PassMark result 53181 57540
PassMark result (single) 3980 4452

The AMD Ryzen 9 8945HX and AMD Ryzen 9 9955HX show a clear performance difference in the PassMark benchmarks. The Ryzen 9 8945HX has a PassMark result of 53181, while the Ryzen 9 9955HX achieves a higher PassMark score of 57540. This suggests that the Ryzen 9 9955HX may offer overall better performance in multi-threaded tasks.

In terms of single-threaded performance, the Ryzen 9 8945HX scores 3980, while the Ryzen 9 9955HX scores 4452, indicating a similar trend with the Ryzen 9 9955HX offering slightly better performance in single-threaded operations as well.

Both processors perform well across the board, but the Ryzen 9 9955HX shows a noticeable advantage in both overall and single-threaded benchmark results.

Integrated graphics:
GPU clock speed 400 MHz 1500 MHz
GPU name Radeon 610M Radeon 610M
GPU turbo 2200 MHz 2200 MHz
DirectX version DirectX 12 Ultimate DirectX 12
supported displays 4 4
OpenGL version 4.6 4.6
OpenCL version 2.1 2
texture mapping units (TMUs) 8 8
render output units (ROPs) 4 4
shading units 128 128

The integrated graphics of the AMD Ryzen 9 8945HX and AMD Ryzen 9 9955HX are both powered by the Radeon 610M GPU, but there are some differences in their specifications. The Ryzen 9 8945HX features a GPU clock speed of 400 MHz, while the Ryzen 9 9955HX has a significantly higher clock speed of 1500 MHz. Both processors have the same GPU turbo speed of 2200 MHz.

In terms of supported features, both processors support up to 4 displays and are compatible with DirectX 12, but the Ryzen 9 8945HX supports DirectX 12 Ultimate, while the Ryzen 9 9955HX supports the standard DirectX 12. Additionally, both products support OpenGL 4.6 and OpenCL 2.1, though the Ryzen 9 9955HX only supports OpenCL 2.0.

Other graphics-related specifications, such as the number of texture mapping units (TMUs), render output units (ROPs), and shading units, are identical between the two products, with both processors offering 8 TMUs, 4 ROPs, and 128 shading units.

Memory:
RAM speed (max) 5200 MHz 5600 MHz
DDR memory version 5 5
memory channels 2 2
maximum memory amount 64GB 96GB
Supports ECC memory ✕ ✕

The AMD Ryzen 9 8945HX and the AMD Ryzen 9 9955HX offer similar memory specifications but with some key differences. Both processors support DDR5 memory and utilize two memory channels. However, the maximum RAM speed for the Ryzen 9 9955HX is 5600 MHz, which is higher than the 5200 MHz supported by the Ryzen 9 8945HX.

In terms of maximum memory capacity, the Ryzen 9 9955HX can handle up to 96 GB of RAM, while the Ryzen 9 8945HX supports a maximum of 64 GB of RAM. Neither processor supports ECC (Error Correcting Code) memory, which is important for certain workloads requiring error detection and correction.

Overall, the Ryzen 9 9955HX offers a higher RAM speed and a larger maximum memory capacity compared to the Ryzen 9 8945HX, making it more suitable for applications requiring higher memory throughput or larger memory configurations.

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 9 8945HX and AMD Ryzen 9 9955HX share identical features in this group. Both processors support the same instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. These instruction sets enable the processors to handle a variety of computational tasks efficiently.

Both processors also support multithreading, allowing them to handle multiple threads simultaneously, which improves performance in multi-core applications. Additionally, both the Ryzen 9 8945HX and Ryzen 9 9955HX feature the NX bit, a security feature that helps protect against certain types of malicious attacks.

There are no differences in the features provided by the two processors in this group—both are equipped with the same instruction sets, multithreading support, and the NX bit.

Comparison Summary & Verdict

After examining the full spec sheets, both processors are clearly capable high-end chips, but they cater to slightly different priorities. The AMD Ryzen 9 8945HX stands out with its unlocked multiplier and superior DirectX 12 Ultimate support on its integrated GPU, making it an appealing choice for enthusiasts who value overclocking flexibility and richer graphics API support. The AMD Ryzen 9 9955HX, on the other hand, pulls ahead with a newer 4 nm process node, higher single and multi-core benchmark results, a significantly faster integrated GPU base clock of 1500 MHz, support for up to 96 GB of RAM, and faster 5600 MHz memory speeds, making it the stronger pick for users who demand maximum out-of-the-box performance and future-ready memory headroom.

AMD Ryzen 9 8945HX
Buy AMD Ryzen 9 8945HX if...

Buy the AMD Ryzen 9 8945HX if you want an unlocked multiplier for overclocking flexibility and prefer DirectX 12 Ultimate support on the integrated GPU.

AMD Ryzen 9 9955HX
Buy AMD Ryzen 9 9955HX if...

Buy the AMD Ryzen 9 9955HX if you need higher benchmark performance, a faster integrated GPU base clock, and support for up to 96 GB of faster DDR5 memory.