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Intel Core i7 1255U
Intel Laptop CPU

Intel Core i7 1255U

45B
Cores10
Threads12
Boost Clock4.7 GHz
TDP12-15 W (configurable)
SocketBGA-1744
Process10 nm
⇄ Compare with…

Benchmarks

Perf.41
iGPU47
Energy55
Cinebench 2024 Single-Core95
Cinebench 2024 Multi-Core446
TDP12-15 W
Cache L312MB
Cinebench 2024 (Single)95
Cinebench 2024 (Multi)446
Geekbench 6 (Single-Core)2248
Geekbench 6 (Multi-Core)7160
Passmark CPU (Single-Core)3149
Passmark CPU (Multi-Core)12,978
Blender CPU77.28
iGPU FLOPS1.9 TFLOPS

Full specifications

GeekBench v6

File compression
626.4 MB/sec
Clang compilation
49.1 Klines/sec
HTML 5 Browser
179.7 pages/sec
PDF Renderer
201.5 Mpixels/sec
Text processing
217.7 pages/sec
Background blur
31.6 images/sec
Photo processing
71.1 images/sec
Ray tracing
9.8 Mpixels/sec

PassMark

Integer math
47.7 GOps/sec
Floating point math
32.2 GOps/sec
Find prime numbers
38M Primes/sec
Random string sorting
16.8M Strings/sec
Data encryption
9.1 GBytes/sec
Data compression
145.7 MBytes/sec
Physics
750 Frames/sec
Extended instructions
8.2B Matrices/sec

Performance Per Watt

Cinebench 2024 / Watt
29.7 PPW
Geekbench 6 Multi / Watt
477.3 PPW
Passmark CPU Mark / Watt
865.2 PPW
Blender / Watt
5.15 PPW

General

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)
Successor
- Intel Core Ultra 7 255U

CPU

P-Cores
2
P-Threads
4
Base Frequency (P)
1.7 GHz
Turbo Boost Frequency (P)
4.7 GHz
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

Package

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

iGPU

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
Max. Memory Size
64 GB
Memory Channels
2
ECC Support
No

Misc

Official Site
Intel Core i7 1255U official page
PCI Express Version
4.0
PCI Express Lanes
20
Technologies
- Compute: ABM, ADX, BMI1, BMI2, CLMUL, F16C, SHA - Performance: EIST, TBT 2.0, TSX - Virtualization: VT-d, VT-x - Security: RDRAND, TXT, XD bit

Specifications compiled from NanoReview. Last updated 2026-09-29.

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