Intel Core Ultra 7 255HX vs Intel Core i5 8257U

VS

Intel Core Ultra 7 255HX

Intel Core i5 8257U

We compared two laptop CPUs: Intel Core Ultra 7 255HX with 20 cores 2.4GHz and Intel Core i5 8257U with 4 cores 1.4GHz . You will find out which processor performs better in benchmark tests, key specifications, power consumption and more.

Main Differences

Intel Core Ultra 7 255HX 's Advantages

Released 5 years and 6 months late

Higher specification of memory (6400 vs 2400)

Larger memory bandwidth (102.4GB/s vs 37.5GB/s)

Newer PCIe version (5 vs 3.0)

Higher base frequency (2.4GHz vs 1.4GHz)

Larger L3 cache size (24MB vs 6MB)

More modern manufacturing process (3nm vs 14nm)

Intel Core i5 8257U 's Advantages

Lower TDP (15W vs 55W)

Score

Intel Core Ultra 7 255HX

VS

Intel Core i5 8257U

General Parameters

Jan 2025

Release Date

Jul 2019

Intel

Manufacturer

Intel

Laptop

Type

Laptop

-

Instruction Set

x86-64

Arrow Lake

Core Architecture

Coffee Lake

-

Processor Number

i5-8257U

Intel Socket 1851

Socket

BGA-1528

Arc Xe-LPG

Integrated Graphics

Iris Plus Graphics 645

Ultra 7 (Arrow Lake)

Generation

-

Package

3 nm

Manufacturing Process

14 nm

17-55 W

Power Consumption

15 W

100 °C

Peak Operating Temperature

100 °C

Intel

Foundry

-

CPU Performance

8

Performance Cores

4

8

Performance Core Threads

8

2.4 GHz

Performance Core Base Frequency

1.4 GHz

5.2 GHz

Performance Core Turbo Frequency

3.9 GHz

12

Efficiency Cores

-

12

Efficiency Core Threads

-

1.8 GHz

Efficiency Core Base Frequency

-

4.5 GHz

Efficiency Core Turbo Frequency

-

20

Total Core Count

4

20

Total Thread Count

8

100 MHz

Bus Frequency

-

24

Multiplier

14x

112 KB per core

L1 Cache

32 K per core

23 MB

L2 Cache

256 K per core

24 MB shared

L3 Cache

6 MB shared

No

Unlocked Multiplier

No

1

SMP

-

Memory Parameters

DDR5-6400

Memory Types

DDR4-2400, LPDDR3-2133

256 GB

Max Memory Size

32 GB

2

Max Memory Channels

2

102.4 GB/s

Max Memory Bandwidth

37.5 GB/s

Yes

ECC Memory Support

No

Graphics Card Parameters

true

Integrated Graphics

true

-

GPU Base Frequency

300 MHz

1900 MHz

GPU Max Dynamic Frequency

1050 MHz

-

Shader Units

384

-

Texture Units

48

-

Raster Operation Units

6

64

Execution Units

48

-

Power Consumption

15 W

-

Max Resolution

4096x2304 - 60 Hz

-

Graphics Performance

0.81 TFLOPS

Miscellaneous

Official Website

Intel Core i5 8257U

5

PCIe Version

3.0

PCIe Lanes

16

-

Extended Instruction Set

SSE4.1, SSE4.2, AVX-2

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