AMD Ryzen 9 9955HX VS Intel Core Ultra 9 275HX

At a high level, both the AMD Ryzen 9 9955HX and the Intel Core Ultra 9 275HX share a strong common foundation: identical 55W TDP, PCIe 5 support, integrated graphics, and full 64-bit compatibility. For most buyers, these shared traits mean neither chip has an inherent platform-level advantage in terms of power envelope or connectivity bandwidth.

The most meaningful differentiators in this group are process node and platform flexibility. Intel's 3 nm process gives it a slight fabrication edge over AMD's 4 nm node — a smaller node generally means better transistor density, which can translate to improved efficiency or performance headroom at the same power budget. However, AMD counters with a significant deployment advantage: the Ryzen 9 9955HX is rated for both laptop and desktop platforms, while the Core Ultra 9 275HX is confined to laptops only. This makes AMD the more versatile silicon for OEMs and system builders targeting multiple form factors.

On thermal limits, Intel allows a slightly higher 105 °C junction temperature versus AMD's 100 °C, which gives Intel's chip a marginally wider thermal headroom before throttling — a minor but real advantage in sustained workloads under aggressive cooling. Overall, Intel holds a narrow edge in process technology and thermal ceiling, but AMD's broader platform support is a practical differentiator that matters in the real world.

The AMD Ryzen 9 9955HX features a CPU speed of 16 cores at 2.5 GHz, with a turbo clock speed of 5.4 GHz. It supports 32 threads, providing ample multitasking capability. The processor has an L2 cache of 16 MB and an L3 cache of 64 MB. Unlike the Intel Core Ultra 9 275HX, it does not utilize big.LITTLE technology, and its clock multiplier is set to 25, with a locked multiplier for fixed performance tuning.

In comparison, the Intel Core Ultra 9 275HX has a more complex configuration with 8 cores running at 2.7 GHz and 16 additional cores running at 2.1 GHz, for a total of 24 threads. It also features a turbo clock speed of 5.4 GHz. The Intel chip is equipped with a larger L2 cache of 40 MB, but a smaller L3 cache of 36 MB. Notably, the Intel processor uses big.LITTLE technology, which divides workloads between high-performance and energy-efficient cores, and its clock multiplier is set to 27, with an unlocked multiplier that allows for more flexibility in performance adjustments.

While both processors share the same turbo clock speed, their configurations differ significantly in terms of cores, threads, cache sizes, and the presence of big.LITTLE technology. Additionally, the Intel Core Ultra 9 275HX has an unlocked multiplier, offering more overclocking potential than the locked multiplier on the AMD Ryzen 9 9955HX.

In the PassMark benchmark results, the AMD Ryzen 9 9955HX achieves a total score of 57,540, with a single-core score of 4,452. Meanwhile, the Intel Core Ultra 9 275HX scores slightly lower with a total of 56,426 and a single-core score of 4,723. While the overall multi-core performance of the Ryzen 9 9955HX is higher, the Intel Core Ultra 9 275HX has a higher single-core performance score.

Both processors show strong performance, with the Ryzen 9 9955HX slightly leading in total PassMark results, while the Intel Core Ultra 9 275HX performs better in single-core tasks. This reflects the different architectural strengths of the two chips, where the Intel processor may excel in tasks that rely more on single-threaded performance.

Overall, both processors are high-performing in their respective categories, with the Ryzen 9 9955HX holding an edge in multi-core performance and the Intel Core Ultra 9 275HX performing slightly better in single-core tasks.

The AMD Ryzen 9 9955HX features an integrated GPU with a clock speed of 1500 MHz and a turbo boost up to 2200 MHz. It supports DirectX 12, OpenGL 4.6, and OpenCL 2, and can drive up to 4 supported displays. In contrast, the Intel Core Ultra 9 275HX has a lower GPU clock speed of 300 MHz, with a turbo boost of 1900 MHz. Like the Ryzen 9 9955HX, it also supports DirectX 12, but with OpenGL 4.5 and OpenCL 3, as well as the ability to support 4 displays.

While both processors offer similar display support, the Ryzen 9 9955HX’s GPU has a higher base clock speed and a slightly higher turbo boost compared to the Intel Core Ultra 9 275HX. Additionally, the Intel processor supports the more recent OpenCL 3 but has a lower OpenGL version (4.5) compared to the Ryzen 9 9955HX, which supports OpenGL 4.6.

In summary, the AMD Ryzen 9 9955HX has a more powerful integrated GPU, with higher clock speeds and better OpenGL support, whereas the Intel Core Ultra 9 275HX has slightly lower GPU performance but supports the newer OpenCL version.

The AMD Ryzen 9 9955HX supports a maximum RAM speed of 5600 MHz and utilizes DDR5 memory with two memory channels. It can handle a maximum of 96 GB of memory, though it does not support ECC memory. The Intel Core Ultra 9 275HX, on the other hand, offers a higher maximum RAM speed of 6400 MHz, also uses DDR5 memory with two memory channels, and supports a much larger maximum memory capacity of 192 GB. Like the Ryzen 9 9955HX, it does not support ECC memory.

While both processors use DDR5 memory with two memory channels, the Intel Core Ultra 9 275HX stands out with a faster RAM speed and a significantly larger maximum memory capacity. Both processors lack ECC memory support, meaning they do not offer error-correction for memory.

In summary, the Intel Core Ultra 9 275HX supports faster RAM and a greater maximum memory size than the AMD Ryzen 9 9955HX, though both processors share the same DDR5 memory version and lack ECC support.

Both the AMD Ryzen 9 9955HX and Intel Core Ultra 9 275HX support the same set of instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. These instruction sets are commonly used for enhancing performance in a variety of tasks, such as multimedia processing, cryptography, and scientific computations. Additionally, both processors feature the NX bit (No-Execute bit), which helps improve security by preventing the execution of certain types of malicious code.

Since both processors have identical instruction set support and both include the NX bit, there is no difference in terms of the advanced features available for execution or security between the two models.

In summary, the AMD Ryzen 9 9955HX and Intel Core Ultra 9 275HX are equivalent in terms of supported instruction sets and security features, with no notable differences in this group.