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AMD Ryzen 9 9955HX
AMD Ryzen 9 9955HX3D

AMD Ryzen 9 9955HX AMD Ryzen 9 9955HX3D

Overview

Welcome to our in-depth specification comparison between the AMD Ryzen 9 9955HX and the AMD Ryzen 9 9955HX3D. Both processors share the same 4 nm architecture, 55W TDP, and identical core configuration, making them closely related siblings on paper. However, key battlegrounds emerge around L3 cache capacity and overall benchmark performance — areas where their differences could meaningfully impact real-world workloads. Read on to find out which chip best suits your needs.

Common Features

  • ✓ Both processors include integrated graphics.
  • ✓ Both have a Thermal Design Power (TDP) of 55W.
  • ✓ Both are built on a 4 nm semiconductor process.
  • ✓ Both have a maximum CPU temperature of 100 °C.
  • ✓ Both support PCI Express (PCIe) version 5.
  • ✓ Both support 64-bit computing.
  • ✓ Both run at a base CPU speed of 16 x 2.5 GHz.
  • ✓ Both have 32 CPU threads.
  • ✓ Both reach a turbo clock speed of 5.4 GHz.
  • ✓ Neither processor has an unlocked multiplier.
  • ✓ Both feature 16 MB of L2 cache.
  • ✓ Both feature 1280 KB of L1 cache.
  • ✓ Both have an L2 cache of 1 MB per core.
  • ✓ Neither processor uses big.LITTLE technology.
  • ✓ Both have an integrated GPU clock speed of 1500 MHz.
  • ✓ Both use the Radeon 610M integrated GPU.
  • ✓ Both have an integrated GPU turbo speed of 2200 MHz.
  • ✓ Both support DirectX 12.
  • ✓ Both support up to 4 displays via integrated graphics.
  • ✓ Both support OpenGL version 4.6.
  • ✓ Both support OpenCL version 2.
  • ✓ Both have 8 texture mapping units (TMUs) in the integrated GPU.
  • ✓ Both support a maximum RAM speed of 5600 MHz.
  • ✓ Both use DDR5 memory.
  • ✓ Both have 2 memory channels.
  • ✓ Both support a maximum memory amount of 96 GB.
  • ✓ 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 security feature.

Main Differences

  • • L3 cache is 64 MB on AMD Ryzen 9 9955HX and 128 MB on AMD Ryzen 9 9955HX3D.
  • • L3 cache per core is 4 MB/core on AMD Ryzen 9 9955HX and 8 MB/core on AMD Ryzen 9 9955HX3D.
  • • PassMark multi-core result is 57540 on AMD Ryzen 9 9955HX and 61356 on AMD Ryzen 9 9955HX3D.
  • • PassMark single-core result is 4452 on AMD Ryzen 9 9955HX and 4491 on AMD Ryzen 9 9955HX3D.
Specs Comparison
AMD Ryzen 9 9955HX

AMD Ryzen 9 9955HX

AMD Ryzen 9 9955HX3D

AMD Ryzen 9 9955HX3D

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

At the general platform level, the AMD Ryzen 9 9955HX and AMD Ryzen 9 9955HX3D are virtually identical across every measured dimension in this group. Both processors share the same 4 nm semiconductor process, a 55W TDP, a maximum CPU temperature of 100 °C, PCIe 5.0 support, integrated graphics, and full 64-bit compatibility.

The only observable difference is cosmetic: the listed form factor order is ″Laptop, Desktop″ for the 9955HX versus ″Desktop, Laptop″ for the 9955HX3D, which likely reflects a difference in primary market positioning rather than any technical distinction — both chips support the same two platform types. The shared 55W TDP is worth noting as a design constraint: it places both processors in the same thermal envelope, meaning system builders face identical cooling requirements regardless of which variant they choose. The PCIe 5.0 interface ensures both are equally capable of leveraging the latest high-bandwidth storage and GPU connectivity.

Based strictly on the general info specs, these two processors are a dead tie. There is no measurable advantage for either chip in this category. Any meaningful differentiation between the 9955HX and 9955HX3D will need to come from other specification groups — most notably architecture or cache-related data.

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 128 MB
L1 cache 1280 KB 1280 KB
L2 core 1 MB/core 1 MB/core
L3 core 4 MB/core 8 MB/core
Uses big.LITTLE technology ✕ ✕
clock multiplier 25 25

The AMD Ryzen 9 9955HX and AMD Ryzen 9 9955HX3D processors share several performance-related specs, with a few differences. Both processors have a CPU speed of 16 x 2.5 GHz and support 32 threads, offering strong multi-threaded performance. Their turbo clock speed is identical at 5.4 GHz, providing high boost performance when needed.

When it comes to cache, both processors feature 16 MB of L2 cache and 1280 KB of L1 cache. However, the Ryzen 9 9955HX3D has a larger L3 cache at 128 MB compared to the Ryzen 9 9955HX’s 64 MB. For L3 cache, the Ryzen 9 9955HX3D has 8 MB per core, while the Ryzen 9 9955HX offers 4 MB per core.

Other specs like the clock multiplier and the use of big.LITTLE technology are the same for both processors: both have a clock multiplier of 25 and neither processor uses big.LITTLE technology. Both also have an unlocked multiplier, but neither processor has this feature enabled.

Benchmarks:
PassMark result 57540 61356
PassMark result (single) 4452 4491

The AMD Ryzen 9 9955HX and AMD Ryzen 9 9955HX3D differ slightly in their benchmark results. The Ryzen 9 9955HX scores 57,540 in the overall PassMark benchmark, while the Ryzen 9 9955HX3D scores slightly higher with 61,356. In the single-threaded PassMark test, the Ryzen 9 9955HX achieves a score of 4,452, while the Ryzen 9 9955HX3D scores a marginally higher 4,491.

Both processors show similar performance gains in their single-threaded tests, with the Ryzen 9 9955HX3D pulling ahead in both categories.

Overall, while the two processors are very close in performance, the Ryzen 9 9955HX3D does edge out the Ryzen 9 9955HX in both total and single-threaded PassMark scores.

Integrated graphics:
GPU clock speed 1500 MHz 1500 MHz
GPU name Radeon 610M Radeon 610M
GPU turbo 2200 MHz 2200 MHz
DirectX version DirectX 12 DirectX 12
supported displays 4 4
OpenGL version 4.6 4.6
OpenCL version 2 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 9955HX and the AMD Ryzen 9 9955HX3D are identical in terms of key specifications. Both processors feature a Radeon 610M GPU with a GPU clock speed of 1500 MHz and a turbo clock of 2200 MHz. They also support DirectX 12, OpenGL 4.6, and OpenCL 2, ensuring compatibility with modern graphics standards.

In terms of display support, both processors can handle up to 4 displays. Their GPU architecture also includes 8 texture mapping units (TMUs), 4 render output units (ROPs), and 128 shading units, ensuring similar performance for both processors' integrated graphics.

Overall, the integrated graphics capabilities are exactly the same between the Ryzen 9 9955HX and Ryzen 9 9955HX3D, with no differences in any of the listed specs.

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

The AMD Ryzen 9 9955HX and AMD Ryzen 9 9955HX3D offer identical memory specifications. Both processors support a maximum RAM speed of 5600 MHz and are compatible with DDR5 memory. They also feature two memory channels, allowing for dual-channel memory configurations.

Both processors can handle a maximum of 96GB of memory, providing ample capacity for demanding tasks. Neither processor supports ECC (Error-Correcting Code) memory, which is typically used for error detection in critical systems.

In summary, the memory capabilities of the Ryzen 9 9955HX and Ryzen 9 9955HX3D are the same across all listed specifications.

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 9955HX and AMD Ryzen 9 9955HX3D offer identical features when it comes to instruction sets, multithreading, and security. Both processors support the same instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2, ensuring compatibility with a wide range of modern software and applications.

Both processors also support multithreading, which allows them to handle multiple tasks simultaneously, improving performance in multi-threaded workloads. Additionally, both models have the NX bit feature, providing enhanced security by preventing certain types of attacks.

In summary, there are no differences in the features of the Ryzen 9 9955HX and Ryzen 9 9955HX3D. They are identical in terms of supported instruction sets, multithreading, and security features.

Comparison Summary & Verdict

After a thorough side-by-side comparison, it is clear that the AMD Ryzen 9 9955HX and AMD Ryzen 9 9955HX3D are nearly identical in their foundations — sharing the same cores, threads, base and turbo clocks, TDP, memory support, and integrated Radeon 610M graphics. The decisive distinction lies in the L3 cache: the 9955HX3D doubles it to 128 MB (8 MB per core) versus 64 MB on the 9955HX, which translates into a measurable lead in both multi-core and single-core PassMark scores. If maximum cache capacity and that extra benchmark headroom matter to your workload, the 9955HX3D is the stronger choice. If those gains are not a priority for your use case, the standard 9955HX delivers an essentially equivalent feature set at its own price point.

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

Buy the AMD Ryzen 9 9955HX if the doubled L3 cache of the 9955HX3D is not critical to your workload and you want a processor with the same core architecture, TDP, and integrated graphics at its own price tier.

AMD Ryzen 9 9955HX3D
Buy AMD Ryzen 9 9955HX3D if...

Buy the AMD Ryzen 9 9955HX3D if you want the advantage of 128 MB of L3 cache and higher PassMark multi-core and single-core benchmark scores for demanding, cache-sensitive tasks.