Intel Core Ultra 7 251HX

The Intel Core Ultra 7 251HX is a mobile high-end CPU for gaming notebooks based on the Arrow Lake architecture. It offers 18 cores consisting of 6 of the 8 fast performance cores with up to 5.1 GHz and 12 of the 16 smaller efficiency cores with up to 4.5 GHz clock speed. The CPU has access to 30 MB L2 cache and 30 MB L3 cache and is specified with a TDP of 45 watts.

The SoC integrates a small dedicated NPU called AI Boost with 13 TOPS (Int8) and does not support vPro. The integrated memory controller supports up to 256 GB DDR5-6400 (dual channel, ECC optional). The integrated GPU (iGPU) is a small Intel Graphics graphics card with four Xe cores running at 300 - 1800 MHz.

Performance - High End

Due to the 18 cores and the high clock rate, the performance should be between Core Ultra 7 245HX and Ultra 7 255HX in the high-end range of mobile CPUs. The performance should therefore be sufficient for all demanding applications and games in 2016.

Production - TSMC and Foveros

The Arrow Lake-HX chips are based on the desktop Arrow Lake-S chips and are composed of several chiplets. The CPU part is manufactured at TSMC using the modern N3B (3nm) process. The GPU also comes from TSMC in the N5P process. The SoC and I/O tile are manufactured in the TSMC N6 process. The base tile is manufactured by Intel in the 22nm process and carries the individual chiplets thanks to Fovero's 3D packaging.

Codename	Arrow Lake-HX
Series	Intel Arrow Lake
Series: Arrow Lake Arrow Lake-HX Intel Core Ultra 9 290HX Plus 1.8 - 5.5 GHz 24 / 24  36 MB L3 Intel Core Ultra 9 285HX 2.1 - 5.5 GHz 24 / 24  36 MB L3 Intel Core Ultra 9 275HX 2.1 - 5.4 GHz 24 / 24  36 MB L3 Intel Core Ultra 7 270HX Plus 1.8 - 5.3 GHz 20 / 20  36 MB L3 Intel Core Ultra 7 265HX 2.3 - 5.3 GHz 20 / 20  36 MB L3 Intel Core Ultra 7 255HX 2.3 - 5.2 GHz 20 / 20  36 MB L3 Intel Core Ultra 7 251HX « 2.5 - 5.1 GHz 18 / 18  30 MB L3 Intel Core Ultra 5 245HX 2.6 - 5.1 GHz 14 / 14  26 MB L3 Intel Core Ultra 5 235HX 2.6 - 5.1 GHz 14 / 14  26 MB L3
Clock Rate	2500 - 5100 MHz
Level 2 Cache	30 MB
Level 3 Cache	30 MB
Number of Cores / Threads	18 / 18 6 x 5.1 GHz Intel Lion Cove P-Core 12 x 4.5 GHz Intel Skymont E-Core
Power Consumption (TDP = Thermal Design Power)	45 Watt
TDP Turbo PL2	160 Watt
Manufacturing Technology	3 nm
GPU	Intel Graphics 4-Core iGPU (Meteor / Arrow Lake) (300 - 1800 MHz)
NPU / AI	13 TOPS INT8
Chip AI	30 TOPS INT8
64 Bit	64 Bit support
Architecture	x86
Announcement Date	04/01/2026
Product Link (external)	www.intel.com

Benchmarks

- Range of benchmark values
- Average benchmark values
* Smaller numbers mean a higher performance

No reviews found for this CPU (yet).

Other CPUs of the series Arrow Lake

Surrounding CPUs