Product Compare

Intel Core Ultra 7 251HX vs Intel Core i7 8557U

	CPU Intel Core Ultra 7 251HX	CPU Intel Core i7 8557U
General Parameters
Release Date	Apr 2026	Jul 2019
Manufacturer	Intel	Intel
Type	Laptop	Laptop
Instruction Set	x86-64	x86-64
Core Architecture	Arrow Lake	Coffee Lake
Processor Number	251HX	i7-8557U
Integrated Graphics	Arc Graphics (4-Cores)	Iris Plus Graphics 645
Package
Manufacturing Process	3 nm	14 nm
Socket	FCBGA-2114	BGA-1528
Power Consumption	45-55 W	15 W
Max Turbo Power Consumption	160 W
Peak Operating Temperature	105 °C	100 °C
CPU Performance
Performance Cores	6	4
Performance Core Threads	6	8
Performance Core Base Frequency	2.9 GHz	1.7 GHz
Performance Core Turbo Frequency	5.1 GHz	4.5 GHz
Efficiency Cores	12
Efficiency Core Threads	12
Efficiency Core Base Frequency	2.5 GHz
Efficiency Core Turbo Frequency	4.5 GHz
Total Core Count	18	4
Total Thread Count	18	8
Bus Frequency	100 MHz
Multiplier	29	17x
L1 Cache	192 K per core	32 K per core
L2 Cache	2 MB per core	256 K per core
L3 Cache	30 MB shared	8 MB shared
Unlocked Multiplier	Yes	No
Memory Parameters
Memory Types	DDR5-6400	DDR4-2400, LPDDR3-2133
Max Memory Size	256 GB	32 GB
Max Memory Channels	2	2
Max Memory Bandwidth	102.4 GB/s	37.5 GB/s
ECC Memory Support	No	No
Graphics Card Parameters
Integrated Graphics	true	true
GPU Base Frequency	300 MHz	300 MHz
GPU Max Dynamic Frequency	1800 MHz	1150 MHz
Shader Units	512	384
Texture Units	32	48
Raster Operation Units	16	6
Execution Units	64	48
Power Consumption	14	15 W
Max Resolution		4096x2304 - 60 Hz
Miscellaneous
Official Website	Official Link ↗	Official Link ↗
PCIe Version	5.0	3.0
PCIe Lanes	24	16
Extended Instruction Set		SSE4.1, SSE4.2, AVX-2