Intel Core Ultra 7 255HX VS Intel Core Ultra 9 285H

Both the Intel Core Ultra 7 255HX and the Core Ultra 9 285H are laptop-class processors built on the same 3 nm manufacturing process, and they share several foundational features: integrated graphics, PCIe 5 support, and 64-bit compatibility. This common platform means users of either chip benefit from the latest interconnect bandwidth and modern workload support, so these shared traits are essentially a tie.

The most meaningful divergence in this group lies in Thermal Design Power. The Core Ultra 7 255HX carries a 55W TDP versus the Core Ultra 9 285H's 45W TDP — a 22% difference. In practice, a higher TDP signals that the chip is designed to sustain greater power draw, which typically translates to higher peak and sustained performance, but also demands more robust cooling and larger battery capacity. The 255HX is therefore better suited to thick-and-light or gaming-oriented laptops where thermal headroom is available, while the 285H's lower TDP makes it the more versatile option for thinner, more portable designs without sacrificing the ″Ultra″ tier feature set.

On thermal tolerance, the 285H edges ahead with a maximum CPU temperature of 110 °C compared to the 255HX's 105 °C, meaning its silicon can sustain brief thermal peaks slightly longer before throttling. The two chips also use different sockets (BGA 2114 vs. BGA 2049), confirming they target distinct laptop chassis designs and are not interchangeable. Overall, the Core Ultra 7 255HX holds the edge for raw sustained power delivery, while the Core Ultra 9 285H offers greater thermal ceiling tolerance and better efficiency headroom — making the right choice highly dependent on the target laptop form factor.

The Intel Core Ultra 7 255HX and Intel Core Ultra 9 285H both utilize big.LITTLE technology, but their performance characteristics differ. The 255HX features a CPU speed configuration of 8 cores at 2.4 GHz and 12 cores at 1.8 GHz, with a turbo clock speed of 5.2 GHz. In comparison, the 285H has 6 cores running at 2.9 GHz and 8 cores at 2.7 GHz, with a slightly higher turbo clock speed of 5.4 GHz.

When it comes to CPU threads, the 255HX offers 20 threads, whereas the 285H has 16 threads. Additionally, the 255HX has an unlocked multiplier, allowing for potential overclocking, while the 285H does not feature an unlocked multiplier.

Finally, the 255HX has a clock multiplier of 24, while the 285H has a slightly higher clock multiplier of 29. These differences reflect the varying approaches to performance across the two processors.

The Intel Core Ultra 7 255HX and Intel Core Ultra 9 285H show significant differences in PassMark benchmark results. The 255HX achieves a total PassMark score of 50739, which is notably higher than the 285H's score of 33969.

For single-threaded performance, the 255HX scores 4645, while the 285H achieves a slightly lower score of 4472.

When overclocked, the 255HX reaches a PassMark result of 53565, surpassing the 285H's overclocked result of 34411. These benchmarks reflect the performance disparity between the two processors.

The Intel Core Ultra 7 255HX and Intel Core Ultra 9 285H both feature integrated graphics with similar base specifications. Both processors have a GPU clock speed of 300 MHz and support 4 displays. They also both support DirectX 12, though the 285H goes further with DirectX 12 Ultimate, while the 255HX is limited to DirectX 12.

In terms of GPU turbo speeds, the 255HX reaches 1850 MHz, while the 285H can boost to 2350 MHz, offering a higher turbo frequency.

For OpenGL and OpenCL versions, both processors support OpenCL version 3, but the 285H supports OpenGL version 4.6, whereas the 255HX supports OpenGL version 4.5.

The Intel Core Ultra 7 255HX and Intel Core Ultra 9 285H both support DDR5 memory with two memory channels. However, they differ in several key memory specifications. The 255HX supports a maximum RAM speed of 6400 MHz, while the 285H supports a faster maximum RAM speed of 8400 MHz.

When it comes to maximum memory capacity, the 255HX can handle up to 192GB of RAM, whereas the 285H is limited to 128GB.

Neither processor supports ECC memory, so both are suitable for typical consumer-grade applications but not for systems requiring error-correcting code memory.

Both the Intel Core Ultra 7 255HX and Intel Core Ultra 9 285H support the same set of instruction sets, including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2, ensuring compatibility with a wide range of software and workloads.

Additionally, both processors have the NX bit, a security feature that helps protect against certain types of malicious attacks, such as buffer overflow exploits.

With identical instruction sets and security features, the 255HX and 285H offer similar capabilities in this group.