Intel Core i7 1255U vs i5 1135G7

We compared two laptop CPUs: the 1.7 GHz Intel Core i7 1255U with 10-cores against the 0.9-2.4 GHz i5 1135G7 with 4-cores. On this page, you'll find out which processor has better performance in benchmarks, games and other useful information.


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 1135G7 and 1255U
Advantages of Intel Core i7 1255U
  • Has 6 more physical cores
  • Newer - released 1-year and 6-months later
  • Has 4096 KB larger L3 cache size
  • 12% higher Turbo Boost frequency (4.7 GHz vs 4.2 GHz)
  • 13% faster in a single-core Geekbench v6 test - 1681 vs 1483 points

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)

GeekBench v6

The new version of this benchmark emulates common operations often used in real-world apps
Geekbench 6 (Single-Core)
Geekbench 6 (Multi-Core)
File compression 513.4 MB/sec 447.3 MB/sec
Clang compilation 36.1 Klines/sec 27.2 Klines/sec
HTML 5 Browser 144.2 pages/sec 103.3 pages/sec
PDF Renderer 152.3 Mpixels/sec 139.9 Mpixels/sec
Text processing 196.7 pages/sec 125.8 pages/sec
Background blur 37.3 images/sec 26 images/sec
Photo processing 69.3 images/sec 50.2 images/sec
Ray tracing 11.9 Mpixels/sec 6.91 Mpixels/sec
Sources: GeekBench [1], [2]


Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Integer math 51.6 GOps/sec 32.9 GOps/sec
Floating point math 34.2 GOps/sec 19.9 GOps/sec
Find prime numbers 45M Primes/sec 36M Primes/sec
Random string sorting 17.4M Strings/sec 13.2M Strings/sec
Data encryption 9.6 GBytes/sec 5.7 GBytes/sec
Data compression 150.3 MBytes/sec 107.7 MBytes/sec
Physics 860 Frames/sec 605 Frames/sec
Extended instructions 8.4B Matrices/sec 7.8B Matrices/sec
Sources: PassMark [3], [4]


Full technical specification of Intel Core i7 1255U and i5 1135G7


Vendor Intel Intel
Released February 23, 2022 September 2, 2020
Type Laptop Laptop
instruction set x86-64 x86-64
Codename Alder Lake Tiger Lake
Model number i7-1255U i5-1135G7
Integrated GPU Iris Xe Graphics (96EU) Iris Xe Graphics G7 80EU


Performance Cores
P-Cores 2 4
P-Threads 4 8
Base Frequency (P) 1.7 GHz 0.9-2.4 GHz
Turbo Boost Frequency (P) 4.7 GHz 4.2 GHz
Efficient Cores
E-Cores 8 -
E-Threads 8 -
Base Frequency (E) 1.2 GHz -
Turbo Boost Frequency (E) 3.5 GHz -
Total Cores 10 4
Total Threads 12 8
Bus Frequency 100 MHz 100 MHz
Multiplier 17x 9-24x
Bus Bandwidth - 4 GT/s
L1 Cache 80K (per core) 96K (per core)
L2 Cache 1280K (per core) 1280K (per core)
L3 Cache 12MB (shared) 8MB (shared)
Unlocked Multiplier No No


Fabrication process 10 nm 10 nm
TDP (PL1) 12-15 W (configurable) 12-28 W (configurable)
Max. Boost TDP (PL2) 55 W -
Socket BGA-1744 BGA-1449
Peak temperature 100°C 100°C


Integrated Graphics Intel Iris Xe Graphics (96EU) Iris Xe Graphics G7 80EU
GPU Base Clock 300 MHz 300 MHz
GPU Boost Clock 1250 MHz 1300 MHz
Shading Units 768 640
TMUs 48 40
ROPs 24 20
Execution Units 96 80
TGP 15 W 15 W

Memory Support

Memory types - DDR5-4800
- DDR4-3200
- LPDDR5-5200
- LPDDR4x-4267
- DDR4-3200
- LPDDR4-4267
Memory Size 64 GB 64 GB
Max. Memory Channels 2 2
ECC Support No No


Official site Intel Core i7 1255U official page Intel Core i5 1135G7 official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 16

Cast your vote

Choose between two processors
63 (82.9%)
13 (17.1%)
Total votes: 76


So which CPU will you choose: Intel Core i5 1135G7 or i7 1255U?