Intel Core Ultra 5 245HX VS Intel Core Ultra 7 255U

Both the Core Ultra 5 245HX and the Core Ultra 7 255U are laptop processors built on the same 3 nm process node and share integrated graphics support along with full 64-bit compatibility — so on a foundational level, they are manufactured to the same modern standard. The critical fork in the road, however, is their power envelope: the 245HX carries a 55W TDP versus the 255U's 15W TDP. This is not a minor gap — it signals two entirely different design philosophies. The 245HX is built for high-performance laptops like mobile workstations or gaming machines that can sustain heavy thermal and electrical loads, while the 255U is engineered for thin-and-light ultrabooks prioritizing battery life and passive or near-passive cooling.

The socket difference — BGA 2114 on the 245HX versus BGA 2049 on the 255U — reflects this divergence further, as the larger pin count on the 245HX accommodates the broader power delivery and memory bandwidth demands of a performance-class chip. On connectivity, the 245HX steps ahead with PCIe 5.0 support compared to the 255U's PCIe 4.0, meaning faster potential throughput to NVMe storage and discrete GPUs — relevant for users who pair the chip with high-end peripherals. The 255U's slightly higher maximum CPU temperature (110 °C vs. 105 °C) is a minor point and unlikely to have practical impact for most users.

The edge here depends entirely on use case. The Core Ultra 5 245HX has a clear advantage for performance-intensive workloads, offering higher sustained power, a wider platform socket, and next-generation PCIe bandwidth. The Core Ultra 7 255U, by contrast, wins decisively for portability and efficiency — its 15W TDP makes it the right choice for all-day battery life in slim devices. Despite the 255U carrying a higher model tier name, the 245HX is the more powerful processor by design. Users should prioritize the 245HX for power, and the 255U for efficiency.

The Intel Core Ultra 5 245HX and Intel Core Ultra 7 255U both feature 14 CPU threads, but their clock speeds and other performance-related specifications differ significantly. The 245HX has a more complex setup with 6 cores running at 3.1 GHz and 8 cores at 2.6 GHz, offering flexibility across different tasks. In contrast, the 255U has 2 cores running at 2 GHz and 8 cores at 1.7 GHz, which gives it a lower base clock speed overall compared to the 245HX.

Both processors feature turbo clock speeds that push them higher under load. The 245HX can turbo up to 5.1 GHz, while the 255U reaches a slightly higher turbo clock speed of 5.2 GHz. However, the 245HX benefits from having an unlocked multiplier, allowing for greater flexibility in overclocking, whereas the 255U does not have this feature.

Both CPUs use big.LITTLE technology, which optimizes performance and power efficiency by using a mix of high-performance and energy-efficient cores. Additionally, the 245HX has a higher clock multiplier of 31, compared to the 255U’s clock multiplier of 20, further indicating the higher performance potential of the 245HX in terms of processing power and speed.

The Intel Core Ultra 5 245HX and Intel Core Ultra 7 255U show a significant difference in their PassMark benchmark results. The 245HX achieves a total PassMark score of 40059, whereas the 255U scores 18555. This suggests that the 245HX offers considerably more overall processing power according to the PassMark benchmark.

In the single-threaded test, the 245HX also outperforms the 255U, with a result of 4530 compared to 3732 for the 255U. This indicates that the 245HX is stronger in handling single-threaded workloads as well, reflecting its higher core clock speeds and clock multiplier.

Both processors demonstrate strong performance, but the 245HX clearly has a more powerful benchmark result in both overall and single-threaded performance compared to the 255U.

The Intel Core Ultra 5 245HX and Intel Core Ultra 7 255U both feature integrated graphics, but there are a few key differences in their specifications. The 245HX has a GPU turbo speed of 1900 MHz, while the 255U achieves a slightly higher GPU turbo speed of 2100 MHz, indicating that the 255U might provide a bit more graphic processing power in terms of raw speed.

Both processors support DirectX 12, but the 255U goes a step further with support for DirectX 12 Ultimate, which offers additional features like ray tracing and variable rate shading, providing a more advanced graphics experience compared to the 245HX, which only supports DirectX 12.

In terms of other features, both processors support up to 4 displays and are compatible with OpenGL version 4.5 and OpenCL version 3. The 255U does have a slightly newer OpenGL version (4.6), but otherwise, the two models are similar in their display and graphics API support.

The Intel Core Ultra 5 245HX and Intel Core Ultra 7 255U both support DDR5 memory and have 2 memory channels, but they differ in several key aspects. The 245HX supports a maximum RAM speed of 6400 MHz, while the 255U can handle faster memory, with a maximum RAM speed of 8400 MHz. This indicates that the 255U can potentially offer faster memory performance in compatible setups.

When it comes to maximum memory capacity, the 245HX supports up to 192GB, which is significantly higher than the 255U’s maximum of 128GB. This makes the 245HX a better option for users who require large amounts of memory for demanding tasks.

Additionally, the 245HX supports ECC (Error-Correcting Code) memory, providing increased reliability for critical applications, whereas the 255U does not support ECC memory. This makes the 245HX more suitable for workloads where data integrity is important.

The Intel Core Ultra 5 245HX and Intel Core Ultra 7 255U share identical instruction set support, both including F16C, MMX, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. This ensures compatibility with a wide range of applications, from multimedia to encryption and high-performance computing tasks.

Both processors also feature the NX bit, a security feature that helps prevent certain types of attacks by marking areas of memory as non-executable. This makes them equally equipped in terms of security capabilities for modern computing environments.

In summary, when it comes to features, the 245HX and 255U are identical, offering the same instruction sets and security features.