AMD Ryzen 9 9955HX VS Intel Core Ultra 7 255HX

At a high level, both the AMD Ryzen 9 9955HX and the Intel Core Ultra 7 255HX share a strong common foundation: identical 55W TDP, PCIe 5 support, integrated graphics, and full 64-bit capability. This means neither has a blanket thermal or bandwidth advantage out of the box, and both are firmly positioned as high-performance mobile processors.

Where the two diverge meaningfully is in manufacturing process and thermal headroom. Intel's 3 nm process node gives it a slight edge over AMD's 4 nm in terms of transistor density, which theoretically enables better power efficiency or performance per mm² — though real-world gains depend heavily on architectural execution. On the other hand, Intel's higher maximum CPU temperature of 105 °C versus AMD's 100 °C suggests Intel's silicon is rated to sustain more thermal stress before throttling, which can be an advantage under sustained heavy workloads in thermally constrained laptop chassis.

One practical differentiator worth noting: the Ryzen 9 9955HX is rated for both laptop and desktop form factors, while the Core Ultra 7 255HX is strictly a laptop chip. This gives AMD broader deployment flexibility for system builders. Overall, neither chip holds a sweeping advantage in this general category — it is largely a tie — but Intel edges ahead marginally on process node refinement, while AMD offers greater platform versatility.

The AMD Ryzen 9 9955HX and Intel Core Ultra 7 255HX differ in several performance-related specs, starting with their CPU speed. The Ryzen 9 9955HX has a fixed CPU speed of 16 x 2.5 GHz, while the Intel Core Ultra 7 255HX has a more complex configuration with 8 cores running at 2.4 GHz and 12 cores at 1.8 GHz. This gives the Intel chip a more varied performance profile but fewer cores running at higher speeds compared to the Ryzen 9.

In terms of threads, the Ryzen 9 9955HX offers 32 threads, significantly more than the Intel Core Ultra 7 255HX's 20 threads. This could make the Ryzen 9 more suited for heavily multithreaded tasks. Both processors have a turbo clock speed, with the Ryzen 9 reaching 5.4 GHz and the Intel chip reaching 5.2 GHz, which are very close but still slightly favoring the Ryzen in peak performance.

When it comes to cache, the Ryzen 9 9955HX has a 16 MB L2 cache, while the Intel Core Ultra 7 255HX offers a larger 36 MB L2 cache. The Intel chip also benefits from an unlocked multiplier, which gives it more flexibility for overclocking, whereas the Ryzen 9 has a fixed multiplier. Additionally, the Intel processor utilizes big.LITTLE technology, which is not present in the Ryzen 9 9955HX, indicating that the Intel chip is designed with energy efficiency in mind by using different types of cores for different tasks. The Ryzen 9, however, uses a fixed clock multiplier of 25.

When looking at benchmark scores, the AMD Ryzen 9 9955HX and Intel Core Ultra 7 255HX show differences in their overall and single-core performance. The Ryzen 9 9955HX achieves a PassMark result of 57540, while the Intel Core Ultra 7 255HX scores 50739. This indicates that the Ryzen 9 has a higher overall performance score compared to the Intel processor.

In terms of single-core performance, the Ryzen 9 9955HX scores 4452, while the Intel Core Ultra 7 255HX slightly surpasses it with a score of 4645. This suggests that the Intel chip may have a slight edge in single-core tasks.

These benchmark results reveal that the Ryzen 9 excels in multi-core performance, while the Intel processor performs slightly better in single-core tasks.

The integrated graphics in the AMD Ryzen 9 9955HX and Intel Core Ultra 7 255HX show some distinct differences. The Ryzen 9 has a GPU clock speed of 1500 MHz, which is significantly higher than the Intel Core Ultra 7’s 300 MHz. In terms of GPU turbo speeds, the Ryzen 9 reaches 2200 MHz, while the Intel chip peaks at 1850 MHz.

Both processors support DirectX 12, though the Ryzen 9 supports OpenGL 4.6, while the Intel Core Ultra 7 supports OpenGL 4.5. Additionally, the Ryzen 9 supports OpenCL 2, while the Intel chip supports OpenCL 3. Both processors support up to four displays, offering similar multi-display capabilities.

Overall, the Ryzen 9 appears to have more powerful integrated graphics in terms of clock speeds and support for slightly newer graphics standards, though both processors share similar display and DirectX support.

The memory specifications of the AMD Ryzen 9 9955HX and Intel Core Ultra 7 255HX reveal some key differences. The Ryzen 9 supports a maximum RAM speed of 5600 MHz, while the Intel Core Ultra 7 supports a higher maximum RAM speed of 6400 MHz. Both processors use DDR5 memory and feature 2 memory channels, providing similar memory bandwidth capabilities.

In terms of memory capacity, the Ryzen 9 9955HX is limited to a maximum of 96GB, whereas the Intel Core Ultra 7 255HX supports up to 192GB of memory, offering a much larger maximum capacity. Neither processor supports ECC memory, meaning they do not offer error-correcting code support for improved reliability in memory-heavy workloads.

Overall, the Intel chip provides higher memory speed and capacity, while both processors share the same memory version and channel configuration.

Both the AMD Ryzen 9 9955HX and Intel Core Ultra 7 255HX share identical instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. These sets ensure both processors are capable of handling a wide range of modern computing tasks, such as multimedia processing and cryptography.

Additionally, both processors have the NX bit (No eXecute bit), which is a security feature that helps prevent the execution of malicious code in certain areas of memory.

Overall, in terms of features, both processors are equally equipped with the same instruction sets and security features.