Intel Core Ultra 7 255HX

The Intel Core Ultra 7 255HX is a mobile high-end CPU for gaming notebooks based on the Arrow Lake architecture. It offers 20 cores consisting of 8 fast performance cores with up to 5.2 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 36 MB L3 cache and is specified with a TDP of 55 watts.

The SoC integrates a small dedicated NPU called AI Boost with 13 TOPS (Int8) and optionally supports vPro Essentials. The integrated memory controller supports up to 192 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 - 1850 MHz.

Performance - High End

Thanks to the improved IPC of the cores (especially the efficiency cores), the CPU should perform just behind or at the level of the Raptor Lake Core i9-14700HX (8 + 12 cores, max 5.5 / 3.9 GHz). This makes the CPU ideal for demanding tasks such as high-end gaming and content creation.

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 in 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 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 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 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	2300 - 5200 MHz
Level 2 Cache	30 MB
Level 3 Cache	36 MB
Number of Cores / Threads	20 / 20 8 x 5.2 GHz Intel Lion Cove P-Core 12 x 4.5 GHz Intel Skymont E-Core
Power Consumption (TDP = Thermal Design Power)	55 Watt
TDP Turbo PL2	160 Watt
Manufacturing Technology	3 nm
GPU	Intel Graphics 4-Core iGPU (Arrow Lake) (300 - 1850 MHz)
NPU / AI	13 TOPS INT8
Chip AI	33 TOPS INT8
64 Bit	64 Bit support
Architecture	x86
Announcement Date	01/06/2025
Product Link (external)	www.intel.com

Benchmarks