Intel® Core™ Ultra 7 251HX

The Intel Core Ultra 7 251HX is a laptop processor with a hybrid 18-core layout (6 performance cores + 12 efficiency cores) and 18 threads, built on the Arrow Lake architecture. It launched in Jan 2026. Clocks run from 2.9 GHz base to 5.1 GHz boost. A 30-MB L3 cache backs the cores (3.4 MB per core). It addresses DDR5 memory up to 256 GB across 2 channels. The chip drops into the FCBGA2114 socket and exposes PCIe 5.0 (24 lanes). Rated TDP is 55 W. Notable platform capabilities: Neural Processing Unit (NPU), AVX-VNNI, Extended Page Tables (EPT), Control-flow Enforcement (CET).

The Intel Core Ultra 7 251HX scores 4,489 in single-core performance and 46,714 in multi-core performance (PassMark CPU Mark ratings). From those two ratings Feex computes 14,481 for overall performance, 36,649 for productivity performance, 33,773 for creator performance, 55,181 for engineering performance and 25,146 for gaming performance. Its multi-core throughput works out to 2,595 per core, 2,595 per thread and 849 per watt. Its computed efficiency index is 1,953. Its performance index is 179, so its overall performance is 79% above the Intel Core i5-12400 (index 100). Each bar shows the score as a share of a reference ceiling, which is the larger of the 99th-percentile score across the Feex CPU database and a fixed baseline.

Scores for individual PassMark CPU Mark test categories. Higher is better. These are measured test scores, not computed from the single-core and multi-core ratings.

In the individual workload tests the Intel Core Ultra 7 251HX scores 123,080 in integer math, 153,342 in floating-point math, 508,374 in compression, 38,802 in cryptography, 2,429 in physics simulation, 39,420 in vector SIMD, 439 in the prime sieve and 61,102 in sorting. Higher is better. Compared with the Intel Core i5-12400, it is 109% above in integer math, 234% above in floating-point math, 123% above in compression, 238% above in cryptography, 123% above in physics simulation, 154% above in vector SIMD, 555% above in the prime sieve and 170% above in sorting. Each bar shows the score as a share of that workload's reference ceiling, the larger of the 99th-percentile score across CPUs with a recorded value and a fixed baseline.

The Intel Core Ultra 7 251HX has 18 physical cores and runs 18 logical threads. It uses a hybrid layout of 6 performance cores and 12 efficiency cores. It does not support simultaneous multithreading, so its thread count equals its core count. It runs at a base clock of 2.90 GHz and boosts up to 5.10 GHz.

The Intel Core Ultra 7 251HX is a laptop processor, belongs to the Intel Core Ultra 7 family, uses the Arrow Lake architecture, carries the codename Arrow Lake and is manufactured on a 3 nm process. It launched in Jan 2026.

The Intel Core Ultra 7 251HX has 1.78 MB of L1 cache, 30 MB of L2 cache and 30 MB of L3 cache. That adds up to about 61.8 MB of cache, or 3.43 MB per core.

The Intel Core Ultra 7 251HX has a 3-level cache hierarchy: L1 at 1.8 MB, L2 at 30 MB and L3 at 30 MB. L2 is the largest level and makes up about 49% of the cache listed here.

The Intel Core Ultra 7 251HX supports DDR5 memory, addresses up to 256 GB of memory and uses 2 memory channels. It does not support DDR4 and LPDDR memory.

The Intel Core Ultra 7 251HX includes integrated graphics (Intel Graphics).

The Intel Core Ultra 7 251HX uses the FCBGA2114 socket, supports PCI Express 5.0 and provides up to 24 PCIe lanes.

The Intel Core Ultra 7 251HX has a rated TDP of 55 W.

Instruction sets, security, virtualization, AI acceleration and OS readiness. Features are listed as supported, explicitly not supported, or not recorded; a feature that is not recorded is not the same as unsupported.

The Intel Core Ultra 7 251HX is also identified by the model number 251HX.

Feex has recorded 58% of the specifications it tracks for the Intel Core Ultra 7 251HX. Values Feex does not hold are shown as "Not recorded" rather than estimated.

Not recorded: Core Configuration: All-Core Boost and Unlocked Multiplier. Architecture & Generation: ISA Family and Market Status. Cache: L2 Cache (per Core) and L4 Cache. Memory Support: Memory Bandwidth, ECC Memory and Max Memory Speed. Graphics: Graphics Base Clock, Graphics Max Clock, Execution Units, Display Outputs and Max Video Memory. Platform & Compatibility: Package and Package Size. Power & Thermals: Base Power, Maximum Turbo Power, Configurable TDP (Min), Configurable TDP (Max), Max Junction Temperature and Tcase. Physical & Manufacturing: Transistor Count, Die Size, Die Count, Foundry and Launch Price. Naming & Aliases: Normalized Name, SKU, Processor Number and Part Number.

Processors that use the same FCBGA2114 socket as the Intel Core Ultra 7 251HX and have the closest multi-core scores in the Feex database include Intel Core Ultra 7 265HX, Intel Core Ultra 7 270HX+, Intel Core Ultra 7 255HX, Intel Core Ultra 5 235HX and Intel Core Ultra 5 245HX.