AMD Ryzen 9 8940HX VS Intel Core Ultra 7 255H

The most immediately striking difference in this group is Thermal Design Power: the Ryzen 9 8940HX is rated at 55W while the Core Ultra 7 255H operates at just 28W. In practical terms, TDP governs how much sustained heat a cooling system must dissipate, which directly shapes the kind of chassis each chip can live in. The 8940HX demands robust cooling infrastructure — think thicker, actively-ventilated gaming or workstation laptops — whereas the 255H's lower thermal envelope makes it a much better fit for slim, ultraportable designs without sacrificing sustained performance.

On process technology, Intel holds a manufacturing edge with its 3 nm node versus AMD's 5 nm. A smaller node generally yields better transistor density and energy efficiency, which helps explain how Intel manages to keep TDP so low. The AMD chip's higher junction temperature ceiling of 100 °C versus Intel's 110 °C is worth noting as well: a higher thermal limit gives the chip more headroom before throttling, partly compensating for its higher base TDP in thermally constrained environments. Both processors share PCIe 5.0 support and integrated graphics, so connectivity and graphics availability are evenly matched.

One exclusive advantage for the Ryzen 9 8940HX is its desktop compatibility — it can be deployed in both laptop and desktop form factors, giving system builders more flexibility. The Core Ultra 7 255H is strictly a laptop part. Overall, the Intel chip has the clear edge for thin-and-light laptop designs thanks to its dramatically lower TDP and finer process node, while the AMD chip offers greater deployment versatility and a higher thermal headroom ceiling for users who prioritize raw, sustained output in larger chassis.

The AMD Ryzen 9 8940HX and Intel Core Ultra 7 255H show significant differences in their performance specifications. The Ryzen 9 8940HX operates with 16 cores, 32 threads, and a base CPU speed of 2.4 GHz, while the Intel Core Ultra 7 255H has a more complex configuration with 6 high-performance cores at 2 GHz and 8 efficiency cores at 1.5 GHz, totaling 16 threads.

In terms of turbo clock speed, the Ryzen 9 8940HX boosts to 5.3 GHz, slightly ahead of the Intel Core Ultra 7 255H, which peaks at 5.1 GHz. The Ryzen processor also features an unlocked multiplier, allowing for more overclocking potential, whereas the Intel processor has a locked multiplier, limiting overclocking possibilities.

Another difference is in the cache size. The Ryzen 9 8940HX comes with a larger L3 cache at 64 MB, compared to the 24 MB offered by the Intel Core Ultra 7 255H. Additionally, the Ryzen 9 does not use big.LITTLE technology, while the Intel Core Ultra 7 255H does, using a hybrid architecture to balance power efficiency and performance. Lastly, the clock multiplier of the Ryzen 9 8940HX is 24, while the Intel processor has a lower multiplier of 20.

When comparing the benchmark results of the AMD Ryzen 9 8940HX and Intel Core Ultra 7 255H, there are some notable differences. The Ryzen 9 8940HX has a higher overall PassMark result of 51,227, compared to the Intel Core Ultra 7 255H's 30,756. This indicates that, in terms of total performance, the Ryzen 9 8940HX outperforms the Intel processor.

However, in the single-core performance test, the Intel Core Ultra 7 255H slightly edges out the Ryzen 9 8940HX, with a single-core PassMark result of 4,373 compared to the Ryzen's 3,860. This suggests that the Intel processor may offer better performance in tasks that rely heavily on single-threaded processing.

Overall, while the AMD Ryzen 9 8940HX delivers a higher total benchmark score, the Intel Core Ultra 7 255H shows a slight advantage in single-core performance.

The integrated graphics of the AMD Ryzen 9 8940HX and Intel Core Ultra 7 255H differ significantly in their specifications. The Ryzen 9 8940HX features the Radeon 610M GPU, with a base clock speed of 400 MHz and a turbo boost of 2,200 MHz. In contrast, the Intel Core Ultra 7 255H uses the Arc 140T GPU, which has a lower base clock speed of 300 MHz but a slightly higher turbo boost of 2,250 MHz.

When it comes to execution units, the Intel Arc 140T has 8, which is more than the Ryzen's Radeon 610M with only 2 execution units. This suggests that the Intel GPU may have more computational resources. The Intel GPU also boasts 1,024 shading units, significantly outpacing the 128 shading units of the Radeon 610M.

Other differences include texture mapping units (TMUs) and render output units (ROPs). The Intel Arc 140T has 64 TMUs and 32 ROPs, whereas the Radeon 610M has only 8 TMUs and 4 ROPs, indicating the Intel GPU may be better suited for handling more complex graphics tasks. Both GPUs support DirectX 12 (with the Intel GPU supporting DirectX 12 Ultimate), OpenGL 4.6, and OpenCL 3 for the Intel processor, but OpenCL for the Ryzen is version 2.1. Both processors can drive up to 4 displays.

The memory specifications of the AMD Ryzen 9 8940HX and Intel Core Ultra 7 255H differ in several key areas. Both processors support DDR5 memory with 2 memory channels, but the maximum supported RAM speed varies. The Ryzen 9 8940HX supports a maximum RAM speed of 5,200 MHz, while the Intel Core Ultra 7 255H can handle a faster maximum RAM speed of 8,400 MHz.

In terms of maximum memory capacity, the Ryzen 9 8940HX supports up to 64GB of RAM, whereas the Intel Core Ultra 7 255H can support up to 128GB, doubling the Ryzen's capacity.

Both processors do not support ECC (Error-Correcting Code) memory, which is typically used in workstations and servers to improve data integrity. However, this feature is absent in both models, suggesting they are designed for general consumer and high-performance tasks rather than specialized applications requiring ECC memory.

The AMD Ryzen 9 8940HX and Intel Core Ultra 7 255H share some similarities and differences in their feature sets. Both processors support the same instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2, allowing them to handle a wide range of computing tasks efficiently.

One major difference is that the AMD Ryzen 9 8940HX uses multithreading, which enables it to process multiple threads simultaneously, improving performance in parallel workloads. The Intel Core Ultra 7 255H, on the other hand, does not support multithreading, which may limit its performance in certain tasks that benefit from parallel execution.

Both processors include the NX bit, a security feature that helps protect against certain types of attacks by marking areas of memory as non-executable. This feature is present in both the Ryzen 9 8940HX and the Intel Core Ultra 7 255H.