AMD Ryzen 9 8945HX VS Intel Core Ultra 7 255HX

At the foundational level, both the AMD Ryzen 9 8945HX and the Intel Core Ultra 7 255HX share several key platform traits: identical 55W TDP, PCIe 5.0 support, integrated graphics, and full 64-bit compatibility. These commonalities mean neither chip has a structural advantage in terms of power envelope or platform connectivity — system builders get the same thermal budget and the same bandwidth headroom for modern storage and discrete GPUs on both platforms.

The most meaningful differentiator in this group is process node. The Core Ultra 7 255HX is built on a 3nm process, compared to the Ryzen 9 8945HX's 5nm node. A smaller process node generally enables better transistor density, which can translate to improved energy efficiency or more computational headroom within the same power budget — giving Intel a theoretical architectural efficiency edge here. Counterintuitively, the 255HX also carries a slightly higher maximum CPU temperature of 105°C versus the 8945HX's 100°C, suggesting Intel's thermal ceiling is tuned a touch more aggressively, though in practice both are within normal high-performance laptop operating ranges.

One minor but notable point: the Ryzen 9 8945HX is rated for both Desktop and Laptop deployments, whereas the Core Ultra 7 255HX is strictly a laptop chip. This gives AMD slightly broader platform flexibility for integrators. Overall, Intel holds a modest edge in this group purely on process node advancement, while AMD counters with wider deployment versatility.

The AMD Ryzen 9 8945HX and Intel Core Ultra 7 255HX processors offer different configurations in terms of core architecture and performance. The Ryzen 9 8945HX has a total of 32 threads, with a base CPU speed of 16 x 2.5 GHz, while the Core Ultra 7 255HX has 20 threads, with a dual configuration of 8 x 2.4 GHz and 12 x 1.8 GHz. The Ryzen 9 8945HX's higher thread count may provide better multitasking and parallel processing capabilities, although the Intel Core Ultra 7 255HX's dual-speed configuration may allow for more efficient power management under varying workloads.

Both processors are equipped with an unlocked multiplier, allowing for potential overclocking. In terms of turbo clock speed, the Ryzen 9 8945HX offers a slightly higher boost, reaching 5.4 GHz compared to the Core Ultra 7 255HX's 5.2 GHz. Both processors also feature the same clock multiplier of 24, meaning they operate under similar clocking ratios when scaling performance.

Cache sizes differ between the two processors: the Ryzen 9 8945HX has 16 MB of L2 cache, while the Core Ultra 7 255HX offers a larger 36 MB of L2 cache. This suggests the Intel processor could have a larger on-chip memory buffer, potentially helping with data access speed during intensive tasks. Additionally, the Core Ultra 7 255HX uses big.LITTLE technology, which is not present in the Ryzen 9 8945HX. This means the Intel processor may be better at adapting its power and performance characteristics for different workloads, although this is not directly reflected in the raw specs provided.

The AMD Ryzen 9 8945HX and Intel Core Ultra 7 255HX processors show distinct results in PassMark benchmark testing. The Ryzen 9 8945HX has a total PassMark score of 53181, while the Core Ultra 7 255HX follows with a slightly lower score of 50739. This indicates that, overall, the Ryzen 9 8945HX achieves better performance in multi-threaded tasks according to this benchmark.

When considering single-threaded performance, the two processors show a more noticeable difference. The Ryzen 9 8945HX has a single-thread PassMark score of 3980, whereas the Core Ultra 7 255HX surpasses it with a score of 4645. This suggests that, in tasks relying more heavily on single-core performance, the Intel processor performs better than the AMD processor.

In summary, the Ryzen 9 8945HX has the edge in overall multi-threaded performance, while the Core Ultra 7 255HX outperforms the Ryzen processor in single-threaded tasks, based on the provided PassMark results.

The AMD Ryzen 9 8945HX and Intel Core Ultra 7 255HX both feature integrated graphics with notable differences in performance and capabilities. The Ryzen 9 8945HX has a GPU clock speed of 400 MHz, with a turbo boost reaching 2200 MHz, while the Core Ultra 7 255HX has a lower GPU clock speed of 300 MHz, boosting up to 1850 MHz. This indicates that the AMD processor's integrated graphics may offer higher performance in GPU-intensive tasks.

In terms of graphical APIs, the Ryzen 9 8945HX supports DirectX 12 Ultimate, whereas the Core Ultra 7 255HX supports the slightly older DirectX 12. The Ultimate version of DirectX 12 offers additional features, such as enhanced ray tracing, which may result in more advanced graphical capabilities for the AMD processor. Both processors support 4 displays, and they share similar OpenGL and OpenCL support. The Ryzen 9 8945HX supports OpenGL version 4.6 and OpenCL version 2.1, while the Core Ultra 7 255HX supports OpenGL 4.5 and OpenCL 3, meaning the Intel processor supports a slightly newer OpenCL version, which may benefit certain computing tasks.

Overall, the key differences are in GPU clock speed, DirectX version, and OpenCL support. The Ryzen 9 8945HX appears to have a more powerful integrated GPU with better support for DirectX features, while the Core Ultra 7 255HX has a more modern version of OpenCL.

The AMD Ryzen 9 8945HX and Intel Core Ultra 7 255HX both support DDR5 memory, but they differ in several key memory specifications. The Ryzen 9 8945HX supports a maximum RAM speed of 5200 MHz, while the Core Ultra 7 255HX can handle a higher maximum RAM speed of 6400 MHz, providing potentially better memory bandwidth for the Intel processor. Both processors support dual memory channels, meaning they can take advantage of faster data transfer between the memory and the CPU.

In terms of maximum memory capacity, the Ryzen 9 8945HX is limited to 64GB, whereas the Core Ultra 7 255HX can support up to 192GB, allowing for significantly more memory for demanding workloads. Neither processor supports ECC (Error-Correcting Code) memory, which is typically used in systems requiring high reliability for error-free operation.

Overall, the Intel Core Ultra 7 255HX offers a higher RAM speed and much larger memory capacity compared to the AMD Ryzen 9 8945HX, but both processors are equally capable in terms of memory channels and lack ECC memory support.

Both the AMD Ryzen 9 8945HX and Intel Core Ultra 7 255HX processors share the same instruction set support, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. This means both processors are equipped to handle a wide range of modern instruction sets for efficient performance across various applications, including multimedia, encryption, and parallel processing tasks.

Additionally, both processors feature the NX bit, which helps enhance security by preventing the execution of code in certain areas of memory, making them more resistant to certain types of attacks.

In summary, the feature sets of the Ryzen 9 8945HX and Core Ultra 7 255HX are identical in terms of instruction sets and security features, with no differences between the two in this category.