Intel Core i7 1255U

Intel Core i7 1255U
  • Cores: 10
  • L3 cache: 12MB (shared)
  • TDP: 12-15 W (max. boost up to 55 W)
  • Transistor size: 10 nm
Core i7 1255U - laptop processor produced by Intel for socket BGA-1744 that has 10 cores and 12 threads. The base clock frequency of the CPU is 1700 MHz, but due to Turbo Boost technology, it can perform up to 4700 MHz. The size of the L3 cache is 12 MB. Please note that this chip has integrated graphics Intel Iris Xe Graphics (96EU).

Test in Benchmarks

Performance test of Intel Core i7 1255U in benchmarks

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
Clang compilation 36.1 Klines/sec
HTML 5 Browser 144.2 pages/sec
PDF Renderer 152.3 Mpixels/sec
Text processing 196.7 pages/sec
Background blur 37.3 images/sec
Photo processing 69.3 images/sec
Ray tracing 11.9 Mpixels/sec
Sources: GeekBench [1]


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
Floating point math 34.2 GOps/sec
Find prime numbers 45M Primes/sec
Random string sorting 17.4M Strings/sec
Data encryption 9.6 GBytes/sec
Data compression 150.3 MBytes/sec
Physics 860 Frames/sec
Extended instructions 8.4B Matrices/sec
Sources: PassMark [3]


Core i7 1255U technical specifications


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


Performance Cores
P-Cores 2
P-Threads 4
Base Frequency (P) 1.7 GHz
Turbo Boost Frequency (P) 4.7 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
Total Threads 12
Bus Frequency 100 MHz
Multiplier 17x
L1 Cache 80K (per core)
L2 Cache 1280K (per core)
L3 Cache 12MB (shared)
Unlocked Multiplier No


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


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

Memory Support

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


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


Do you have any questions about Core i7 1255U? Please, use comment form below
Anonymous 11 June 2023 08:24
Can it run Minecraft Java+Bedrock Edition Game Smoothly and Normally?
0 Reply
Anonymous 21 November 2022 22:58
Short Circuit easily got a multi-core Cinebench score of 8765 on just a Surface Laptop 5, during which the laptop throttled heavily, so I'm not sure where you're getting such a low number from. I'm sure without throttling this CPU could easily get 10000.
0 Reply