Home > CPU Comparison > Core i7 1355U or Core i7 1255U: what's better?

Intel Core i7 1355U vs i7 1255U

49 out of 100
Intel Core i7 1355U
VS
45 out of 100
Intel Core i7 1255U
Intel Core i7 1355U
Intel Core i7 1255U

We compared two 10-core laptop CPUs: the 1.7 GHz Intel Core i7 1355U against the 1.7 GHz i7 1255U. On this page, you'll find out which processor has better performance in benchmarks, games and other useful information.

  1. Review
  2. Differences
  3. Performance
  4. Specs
  5. Comments (1)

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
Choose your main usage scenario to recalculate the Final Score and see which CPU suits your needs.
๐Ÿ”Œ Usage Scenario:

Key Differences

What are the key differences between 1255U and 1355U
Advantages of Intel Core i7 1355U
  • Supports up to 96 GB DDR5-5200 RAM
  • Newer - released 10 months later
  • 6% higher Turbo Boost frequency (5 GHz vs 4.7 GHz)
  • 10% faster in a single-core Geekbench v6 test - 2466 vs 2248 points

Test in Benchmarks

Comparing the performance of CPUs across various tasks
CPU:
Core i7 1355U
vs
Core i7 1255U

Cinebench

Reputable cross-platform benchmark for high-performance processors
Cinebench 2024 (Single)
Cinebench 2024 (Multi)
Submit your benchmark results

GeekBench v6

The new version of this benchmark emulates common operations often used in real-world apps
Geekbench 6 (Single-Core)
Core i7 1355U +10%
2466
Core i7 1255U
2248
Geekbench 6 (Multi-Core)
File compression 519.7 MB/sec 626.4 MB/sec
Clang compilation 58.7 Klines/sec 49.1 Klines/sec
HTML 5 Browser 159 pages/sec 179.7 pages/sec
PDF Renderer 219.7 Mpixels/sec 201.5 Mpixels/sec
Text processing 221.5 pages/sec 217.7 pages/sec
Background blur 33.4 images/sec 31.6 images/sec
Photo processing 64.2 images/sec 71.1 images/sec
Ray tracing 12.5 Mpixels/sec 9.8 Mpixels/sec
Sources: GeekBench [1], [2] โ€“ 653 & 1162 samples

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Core i7 1355U +7%
13850
Core i7 1255U
12978
Integer math 50.4 GOps/sec 47.7 GOps/sec
Floating point math 33.9 GOps/sec 32.2 GOps/sec
Find prime numbers 48M Primes/sec 38M Primes/sec
Random string sorting 17.2M Strings/sec 16.8M Strings/sec
Data encryption 9.6 GBytes/sec 9.1 GBytes/sec
Data compression 152.3 MBytes/sec 145.7 MBytes/sec
Physics 844 Frames/sec 750 Frames/sec
Extended instructions 8.5B Matrices/sec 8.2B Matrices/sec
Sources: PassMark [3], [4] โ€“ 3976 & 4528 samples

Blender

3D rendering test that measures CPU performance in 3D modeling tasks (uses all cores)
Blender CPU
Core i7 1355U +23%
94.87
Core i7 1255U
77.28

Performance Per Watt

Shows the score you get per each watt of PL1 TDP
Cinebench 2024 / Watt 33.9 PPW 29.7 PPW
Geekbench 6 Multi / Watt 503.5 PPW 477.3 PPW
Passmark CPU Mark / Watt 923.3 PPW 865.2 PPW
Blender / Watt 6.32 PPW 5.15 PPW
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.

Recent User Tests

The latest benchmark tests that have been submitted by users
Intel Core i7 1355U
DateBenchmarkResult
๐Ÿ“˜ 2026-04-28 (Linode)Geekbench 6 CPU2435 / 7355
Add View all (1)
Intel Core i7 1255U
DateBenchmarkResult
๐Ÿ“˜ 2026-02-13 -> Lello75Geekbench 6 CPU2315 / 7219
๐Ÿ“˜ 2025-04-13 (kapple)Cinebench 202495 / 446
Add View all (2)

Specifications

Full technical specification of Intel Core i7 1355U and i7 1255U

General

Vendor Intel Intel
Released January 3, 2023 February 23, 2022
Type Laptop Laptop
Instruction Set x86-64 x86-64
Codename Raptor Lake Alder Lake
Model number i7-1355U i7-1255U
Integrated GPU Iris Xe Graphics (96EU) Iris Xe Graphics (96EU)
Successor - Intel Core Ultra 7 255U - Intel Core Ultra 7 255U
Intel CPU rating (160th and 185th place)

CPU

Performance Cores
P-Cores 2 2
P-Threads 4 4
Base Frequency (P) 1.7 GHz 1.7 GHz
Turbo Boost Frequency (P) 5 GHz 4.7 GHz
Efficient Cores
E-Cores 8 8
E-Threads 8 8
Base Frequency (E) 1.2 GHz 1.2 GHz
Turbo Boost Frequency (E) 3.7 GHz 3.5 GHz
Total
Total Cores 10 10
Total Threads 12 12
Bus Frequency 100 MHz 100 MHz
Multiplier 17x 17x
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 100ยฐC 100ยฐC

iGPU

Integrated Graphics Intel Iris Xe Graphics (96EU) Intel Iris Xe Graphics (96EU)
GPU Base Clock 300 MHz 300 MHz
GPU Boost Clock 1300 MHz 1250 MHz
Shading Units 768 768
TMUs 48 48
ROPs 24 24
Execution Units 96 96
TGP 15 W 15 W
iGPU FLOPS
Core i7 1355U +5%
2 TFLOPS
Core i7 1255U
1.9 TFLOPS
See: Intel Iris Xe Graphics G7 (96EU) benchmarks

Memory Support

Memory Types - DDR5-5200
- DDR4-3200
- LPDDR5-6400
- LPDDR5x-6400
- LPDDR4x-4267		 - DDR5-4800
- DDR4-3200
- LPDDR5-5200
- LPDDR4x-4267
Max. Memory Size 96 GB 64 GB
Memory Channels 2 2
ECC Support No No

Misc

Official Site Intel Core i7 1355U official page Intel Core i7 1255U official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 20

Cast your vote

Choose between two processors
226 (68.5%)
104 (31.5%)
Total votes: 330

Competitors

1. Intel Core i7 1355U vs Intel Core 7 150U (2)
2. Intel Core i7 1355U vs Intel Core Ultra 7 155U (1)
3. Intel Core i7 1355U vs AMD Ryzen 5 7530U
4. Intel Core i7 1355U vs AMD Ryzen 7 7730U
5. Intel Core i7 1355U vs Intel Core i7 13700H (1)
6. Intel Core i7 1355U vs Intel Core i5 1335U
7. Intel Core i7 1355U vs Intel Core Ultra 7 155H
8. Intel Core i7 1255U vs AMD Ryzen 7 7730U
9. Intel Core i7 1255U vs Intel Core i5 1235U (2)
10. Intel Core i7 1255U vs AMD Ryzen 7 5700U
Compare other CPUs (460+)

Comments

So which CPU will you choose: Intel Core i7 1255U or i7 1355U?
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Avatar
Bill Weldon June 22, 2024 at 10:23 PM
I am undecided at this time.
+17 Reply
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