Intel Core i7 1255U vs i5 1235U

We compared two 10-core laptop CPUs: the 1.7 GHz Intel Core i7 1255U against the 1.3 GHz i5 1235U. On this page, you'll find out which processor has better performance in benchmarks, games and other useful information.

Review

General overview and comparison of the processors
Single-Core Performance
Performance in single-threaded apps and benchmarks
Multi-Core Performance
Measure performance when all cores are involved
Power Efficiency
The efficiency score of power consumption
Integrated Graphics
iGPU capabilities for gaming and 3D-intensive tasks
NanoReview Final Score
Generic CPU rating

Key Differences

What are the key differences between 1235U and 1255U
Advantages of Intel Core i7 1255U
  • 7% higher Turbo Boost frequency (4.7 GHz vs 4.4 GHz)
Advantages of Intel Core i5 1235U
  • 23% faster in a single-core Geekbench v6 test - 2067 vs 1681 points
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Test in Benchmarks

Comparing the performance of CPUs across various tasks

Cinebench R23

Reputable cross-platform benchmark for high-performance processors
Cinebench R23 (Single-Core)
Cinebench R23 (Multi-Core)
8253

GeekBench v6

The new version of this benchmark emulates common operations often used in real-world apps
Geekbench 6 (Single-Core)
2067
Geekbench 6 (Multi-Core)
File compression 513.4 MB/sec 735.6 MB/sec
Clang compilation 36.1 Klines/sec 48.3 Klines/sec
HTML 5 Browser 144.2 pages/sec 209.8 pages/sec
PDF Renderer 152.3 Mpixels/sec 220.8 Mpixels/sec
Text processing 196.7 pages/sec 203.8 pages/sec
Background blur 37.3 images/sec 28 images/sec
Photo processing 69.3 images/sec 45.6 images/sec
Ray tracing 11.9 Mpixels/sec 4.96 Mpixels/sec
Sources: GeekBench [1], [2]

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
13845
Integer math 51.6 GOps/sec 51.8 GOps/sec
Floating point math 34.2 GOps/sec 34.7 GOps/sec
Find prime numbers 45M Primes/sec 38M Primes/sec
Random string sorting 17.4M Strings/sec 18M Strings/sec
Data encryption 9.6 GBytes/sec 9.8 GBytes/sec
Data compression 150.3 MBytes/sec 153 MBytes/sec
Physics 860 Frames/sec 749 Frames/sec
Extended instructions 8.4B Matrices/sec 8.5B Matrices/sec
Sources: PassMark [3], [4]

Specifications

Full technical specification of Intel Core i7 1255U and i5 1235U

General

Vendor Intel Intel
Released February 23, 2022 February 23, 2022
Type Laptop Laptop
instruction set x86-64 x86-64
Codename Alder Lake Alder Lake
Model number i7-1255U i5-1235U
Integrated GPU Iris Xe Graphics (96EU) Iris Xe Graphics (80EU)

CPU

Performance Cores
P-Cores 2 2
P-Threads 4 4
Base Frequency (P) 1.7 GHz 1.3 GHz
Turbo Boost Frequency (P) 4.7 GHz 4.4 GHz
Efficient Cores
E-Cores 8 8
E-Threads 8 8
Base Frequency (E) 1.2 GHz 0.9 GHz
Turbo Boost Frequency (E) 3.5 GHz 3.3 GHz
Total
Total Cores 10 10
Total Threads 12 12
Bus Frequency 100 MHz 100 MHz
Multiplier 17x 13x
L1 Cache 80K (per core) 80K (per core)
L2 Cache 1280K (per core) 1280K (per core)
L3 Cache 12MB (shared) 12MB (shared)
Unlocked Multiplier No No

Package

Fabrication process 10 nm 10 nm
TDP (PL1) 12-15 W (configurable) 12-15 W (configurable)
Max. Boost TDP (PL2) 55 W 55 W
Socket BGA-1744 BGA-1744
Peak temperature 100°C 100°C

iGPU

Integrated Graphics Intel Iris Xe Graphics (96EU) Intel Iris Xe Graphics (80EU)
GPU Base Clock 300 MHz 300 MHz
GPU Boost Clock 1250 MHz 1200 MHz
Shading Units 768 640
TMUs 48 40
ROPs 24 20
Execution Units 96 80
TGP 15 W 15 W
iGPU FLOPS
1.69 TFLOPS
1.41 TFLOPS

Memory Support

Memory types - DDR5-4800
- DDR4-3200
- LPDDR5-5200
- LPDDR4x-4267
- DDR5-4800
- DDR4-3200
- LPDDR5-5200
- LPDDR4x-4267
Memory Size 64 GB 64 GB
Max. Memory Channels 2 2
ECC Support No No

Misc

Official site Intel Core i7 1255U official page Intel Core i5 1235U official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 20

Cast your vote

Choose between two processors
324 (42.2%)
443 (57.8%)
Total votes: 767

Comments

So which CPU will you choose: Intel Core i5 1235U or i7 1255U?
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