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AMD Ryzen 9 9955HX3D
Intel Core Ultra 9 285HX

AMD Ryzen 9 9955HX3D Intel Core Ultra 9 285HX

Overview

Welcome to our in-depth specification comparison between the AMD Ryzen 9 9955HX3D and the Intel Core Ultra 9 285HX, two powerhouse mobile processors aimed at demanding users and enthusiasts. Both chips share a 55W TDP and PCIe 5 support, yet they take notably different approaches when it comes to cache architecture, core configuration, and memory capability. Read on as we break down every key specification to help you decide which processor best fits your needs.

Common Features

  • ✓ Both processors have integrated graphics.
  • ✓ Both processors have a Thermal Design Power (TDP) of 55W.
  • ✓ Both processors support PCI Express (PCIe) version 5.
  • ✓ Both processors support 64-bit computing.
  • ✓ Both processors support DirectX 12 on their integrated graphics.
  • ✓ Both processors support up to 4 displays via integrated graphics.
  • ✓ Both processors use DDR5 memory.
  • ✓ Both processors have 2 memory channels.
  • ✓ Both processors share the same instruction sets: MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2.
  • ✓ The NX bit security feature is present on both processors.

Main Differences

  • • The AMD Ryzen 9 9955HX3D is available in Desktop and Laptop form factors, while the Intel Core Ultra 9 285HX is available as a Laptop processor only.
  • • The semiconductor size is 4 nm on the AMD Ryzen 9 9955HX3D and 3 nm on the Intel Core Ultra 9 285HX.
  • • The maximum CPU temperature is 100 °C on the AMD Ryzen 9 9955HX3D and 105 °C on the Intel Core Ultra 9 285HX.
  • • CPU speed is 16 x 2.5 GHz on the AMD Ryzen 9 9955HX3D and 8 x 2.8 GHz plus 16 x 2.1 GHz on the Intel Core Ultra 9 285HX.
  • • The AMD Ryzen 9 9955HX3D has 32 CPU threads, while the Intel Core Ultra 9 285HX has 24 threads.
  • • Turbo clock speed is 5.4 GHz on the AMD Ryzen 9 9955HX3D and 5.5 GHz on the Intel Core Ultra 9 285HX.
  • • An unlocked multiplier is present on the Intel Core Ultra 9 285HX but not available on the AMD Ryzen 9 9955HX3D.
  • • L2 cache is 16 MB on the AMD Ryzen 9 9955HX3D and 40 MB on the Intel Core Ultra 9 285HX.
  • • L3 cache is 128 MB on the AMD Ryzen 9 9955HX3D and 36 MB on the Intel Core Ultra 9 285HX.
  • • big.LITTLE technology is used on the Intel Core Ultra 9 285HX but not on the AMD Ryzen 9 9955HX3D.
  • • The clock multiplier is 25 on the AMD Ryzen 9 9955HX3D and 28 on the Intel Core Ultra 9 285HX.
  • • The PassMark multi-core result is 61356 on the AMD Ryzen 9 9955HX3D and 62297 on the Intel Core Ultra 9 285HX.
  • • The PassMark single-core result is 4491 on the AMD Ryzen 9 9955HX3D and 4784 on the Intel Core Ultra 9 285HX.
  • • Integrated GPU clock speed is 1500 MHz on the AMD Ryzen 9 9955HX3D and 300 MHz on the Intel Core Ultra 9 285HX.
  • • Integrated GPU turbo clock speed is 2200 MHz on the AMD Ryzen 9 9955HX3D and 2000 MHz on the Intel Core Ultra 9 285HX.
  • • OpenGL version is 4.6 on the AMD Ryzen 9 9955HX3D and 4.5 on the Intel Core Ultra 9 285HX.
  • • OpenCL version is 2 on the AMD Ryzen 9 9955HX3D and 3 on the Intel Core Ultra 9 285HX.
  • • Maximum RAM speed is 5600 MHz on the AMD Ryzen 9 9955HX3D and 6400 MHz on the Intel Core Ultra 9 285HX.
  • • Maximum memory capacity is 96 GB on the AMD Ryzen 9 9955HX3D and 192 GB on the Intel Core Ultra 9 285HX.
  • • ECC memory support is present on the Intel Core Ultra 9 285HX but not available on the AMD Ryzen 9 9955HX3D.
Specs Comparison
AMD Ryzen 9 9955HX3D

AMD Ryzen 9 9955HX3D

Intel Core Ultra 9 285HX

Intel Core Ultra 9 285HX

General info:
Type Desktop, Laptop Laptop
Has integrated graphics ✓ ✓
release date January 2025 January 2025
Thermal Design Power (TDP) 55W 55W
semiconductor size 4 nm 3 nm
CPU temperature 100 °C 105 °C
PCI Express (PCIe) version 5 5
Supports 64-bit ✓ ✓

At a high level, these two processors share a remarkably similar foundation: both carry a 55W TDP, support PCIe 5.0, include integrated graphics, and are fully 64-bit capable. For most buyers, these shared traits mean comparable power envelopes and platform-level feature parity — neither chip will demand more from a laptop's cooling system than the other, at least on paper.

The meaningful differentiators lie in fabrication and thermal headroom. The Intel Core Ultra 9 285HX is built on a 3 nm process versus the AMD Ryzen 9 9955HX3D's 4 nm, which theoretically gives Intel an edge in transistor density and potential power efficiency at the silicon level. However, the 285HX also permits a higher maximum CPU temperature of 105 °C versus AMD's 100 °C — a 5-degree ceiling that allows Intel's chip to sustain boost clocks slightly longer under thermal pressure before throttling, which can matter in sustained workloads.

One notable distinction favors AMD: the Ryzen 9 9955HX3D is listed for both Desktop and Laptop form factors, while the 285HX is laptop-only. This gives the AMD chip broader platform applicability. Overall, neither processor holds a commanding general-info advantage — Intel edges ahead on process node refinement and thermal ceiling, while AMD offers greater deployment flexibility.

Performance:
CPU speed 16 x 2.5 GHz 8 x 2.8 & 16 x 2.1 GHz
CPU threads 32 threads 24 threads
turbo clock speed 5.4GHz 5.5GHz
Has an unlocked multiplier ✕ ✓
L2 cache 16 MB 40 MB
L3 cache 128 MB 36 MB
Uses big.LITTLE technology ✕ ✓
clock multiplier 25 28

The AMD Ryzen 9 9955HX3D has a CPU speed of 16 x 2.5 GHz and a turbo clock speed of 5.4 GHz, with 32 threads and a clock multiplier of 25. In comparison, the Intel Core Ultra 9 285HX offers a slightly different configuration, with 8 cores running at 2.8 GHz and 16 cores running at 2.1 GHz, bringing its total to 24 threads. Its turbo clock speed is slightly higher at 5.5 GHz, and it has a clock multiplier of 28.

When it comes to cache, the AMD Ryzen 9 9955HX3D has 16 MB of L2 cache and a substantial 128 MB of L3 cache. On the other hand, the Intel Core Ultra 9 285HX features 40 MB of L2 cache but a smaller 36 MB of L3 cache. This difference in cache sizes may impact certain workloads, though the specifics are not detailed in the specs.

One key difference is that the Intel Core Ultra 9 285HX uses big.LITTLE technology, which is not present in the AMD Ryzen 9 9955HX3D. Additionally, the Intel processor has an unlocked multiplier, allowing for overclocking, while the AMD Ryzen 9 9955HX3D has a locked multiplier, limiting its overclocking potential.

Benchmarks:
PassMark result 61356 62297
PassMark result (single) 4491 4784

The AMD Ryzen 9 9955HX3D and Intel Core Ultra 9 285HX both show strong performance in PassMark benchmarks. The AMD Ryzen 9 9955HX3D achieves a total PassMark result of 61356, while the Intel Core Ultra 9 285HX scores slightly higher with 62297.

In single-threaded performance, the AMD Ryzen 9 9955HX3D scores 4491, while the Intel Core Ultra 9 285HX achieves a higher score of 4784. This suggests that the Intel processor may have a slight edge in tasks that rely on single-core performance, but the difference is relatively modest.

Overall, while both processors perform similarly, the Intel Core Ultra 9 285HX slightly outperforms the AMD Ryzen 9 9955HX3D in both overall and single-threaded benchmarks.

Integrated graphics:
GPU clock speed 1500 MHz 300 MHz
GPU turbo 2200 MHz 2000 MHz
DirectX version DirectX 12 DirectX 12
supported displays 4 4
OpenGL version 4.6 4.5
OpenCL version 2 3

The AMD Ryzen 9 9955HX3D and Intel Core Ultra 9 285HX both feature integrated graphics with support for DirectX 12 and four supported displays. However, their GPU specifications differ in terms of clock speeds and OpenGL/OpenCL versions.

The AMD Ryzen 9 9955HX3D has a GPU clock speed of 1500 MHz and can boost up to 2200 MHz. In contrast, the Intel Core Ultra 9 285HX has a much lower base GPU clock speed of 300 MHz, though its turbo speed is 2000 MHz, which is slightly lower than the AMD's turbo speed.

In terms of API support, the AMD processor supports OpenGL 4.6 and OpenCL 2, while the Intel processor supports OpenGL 4.5 and a newer OpenCL 3. This suggests a small advantage for the Intel processor in terms of newer OpenCL capabilities, though the AMD's higher OpenGL version may provide a different performance experience depending on specific workloads.

Memory:
RAM speed (max) 5600 MHz 6400 MHz
DDR memory version 5 5
memory channels 2 2
maximum memory amount 96GB 192GB
Supports ECC memory ✕ ✓

The AMD Ryzen 9 9955HX3D and Intel Core Ultra 9 285HX both support DDR5 memory and have dual memory channels. However, they differ in several key aspects of memory performance and capacity.

The AMD Ryzen 9 9955HX3D supports a maximum RAM speed of 5600 MHz and can handle up to 96GB of memory. In contrast, the Intel Core Ultra 9 285HX supports a higher maximum RAM speed of 6400 MHz and can accommodate up to 192GB of memory, offering significantly more memory capacity.

Additionally, the Intel processor supports ECC (Error-Correcting Code) memory, while the AMD processor does not, which may be a consideration for applications that require high memory reliability, such as certain workstations or servers.

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
Has NX bit ✓ ✓

Both the AMD Ryzen 9 9955HX3D and the Intel Core Ultra 9 285HX support identical instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. This means they are equipped with similar capabilities for handling various computational tasks and multimedia operations.

Additionally, both processors have the NX bit, which provides enhanced security by preventing the execution of code from non-executable memory regions.

Since the specifications in this group are the same for both processors, there are no differences to note in terms of supported features.

Comparison Summary & Verdict

After examining every specification, both processors emerge as strong performers, but they cater to different priorities. The AMD Ryzen 9 9955HX3D stands out with its massive 128 MB L3 cache and higher integrated GPU clock speeds, making it an excellent choice for workloads that benefit from large on-chip data storage and graphics-intensive tasks. The Intel Core Ultra 9 285HX, on the other hand, pulls ahead with superior single-core benchmark performance, a larger L2 cache of 40 MB, support for up to 192 GB of RAM, ECC memory compatibility, and an unlocked multiplier for tuning flexibility. Its big.LITTLE hybrid architecture and higher maximum RAM speed of 6400 MHz further reinforce its edge in memory-intensive and productivity-focused scenarios.

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

Choose the AMD Ryzen 9 9955HX3D if you want a processor with a vastly larger L3 cache and faster integrated GPU clock speeds for graphics and cache-sensitive workloads.

Intel Core Ultra 9 285HX
Buy Intel Core Ultra 9 285HX if...

Choose the Intel Core Ultra 9 285HX if you need stronger single-core performance, higher maximum memory capacity, ECC memory support, and the flexibility of an unlocked multiplier.