Home > CPU Comparison > Core Ultra 7 255U or Core i7 1355U: what's better?

Intel Core Ultra 7 255U vs i7 1355U

54 out of 100
Intel Core Ultra 7 255U
VS
49 out of 100
Intel Core i7 1355U
Intel Core Ultra 7 255U
Intel Core i7 1355U

We compared two laptop CPUs: the 2.0 GHz Intel Core Ultra 7 255U with 12-cores against the 1.7 GHz i7 1355U with 10-cores. 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

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.
🔌 Usage Scenario:

Key Differences

What are the key differences between 1355U and 255U
Advantages of Intel Core Ultra 7 255U
  • More modern manufacturing process – 3 versus 10 nanometers
  • Newer - released 2 years and 1 month later
  • Supports up to 128 GB LPDDR5-8400 RAM
  • Has 2 more physical cores
  • More than 10° C higher critical temperature
  • 4% higher Turbo Boost frequency (5.2 GHz vs 5 GHz)

Test in Benchmarks

Comparing the performance of CPUs across various tasks
CPU:
Core Ultra 7 255U
vs
Core i7 1355U

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)
Geekbench 6 (Multi-Core)
File compression 999.4 MB/sec 519.7 MB/sec
Clang compilation 75.6 Klines/sec 58.7 Klines/sec
HTML 5 Browser 267.7 pages/sec 159 pages/sec
PDF Renderer 334.8 Mpixels/sec 219.7 Mpixels/sec
Text processing 240.5 pages/sec 221.5 pages/sec
Background blur 46.6 images/sec 33.4 images/sec
Photo processing 80.8 images/sec 64.2 images/sec
Ray tracing 12 Mpixels/sec 12.5 Mpixels/sec
Sources: GeekBench [1], [2] – 653 samples

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Core Ultra 7 255U +29%
17874
Core i7 1355U
13850
Integer math 65.3 GOps/sec 50.4 GOps/sec
Floating point math 45.7 GOps/sec 33.9 GOps/sec
Find prime numbers 63M Primes/sec 48M Primes/sec
Random string sorting 21.3M Strings/sec 17.2M Strings/sec
Data encryption 12.4 GBytes/sec 9.6 GBytes/sec
Data compression 196.1 MBytes/sec 152.3 MBytes/sec
Physics 1137 Frames/sec 844 Frames/sec
Extended instructions 10.8B Matrices/sec 8.5B Matrices/sec
Sources: PassMark [3], [4] – 649 & 3976 samples

Blender

3D rendering test that measures CPU performance in 3D modeling tasks (uses all cores)
Blender CPU

Performance Per Watt

Shows the score you get per each watt of PL1 TDP
Cinebench 2024 / Watt 34.3 PPW 33.9 PPW
Geekbench 6 Multi / Watt 670.5 PPW 503.5 PPW
Passmark CPU Mark / Watt 1191.6 PPW 923.3 PPW
Blender / Watt - 6.32 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 Ultra 7 255U
No benchmark results yet
Add
Intel Core i7 1355U
DateBenchmarkResult
📘 2026-04-28 (Linode)Geekbench 6 CPU2435 / 7355
Add View all (1)

Specifications

Full technical specification of Intel Core Ultra 7 255U and i7 1355U

General

Vendor Intel Intel
Released January 6, 2025 January 3, 2023
Type Laptop Laptop
Instruction Set x86-64 x86-64
Codename Arrow Lake Raptor Lake
Model number 255U i7-1355U
Integrated GPU Arc Graphics (4-Cores) Iris Xe Graphics (96EU)
Successor - - Intel Core Ultra 7 255U
Intel CPU rating (120th and 160th place)

CPU

Performance Cores
P-Cores 2 2
P-Threads 4 4
Base Frequency (P) 2.0 GHz 1.7 GHz
Turbo Boost Frequency (P) 5.2 GHz 5 GHz
Efficient Cores
E-Cores 10 8
E-Threads 10 8
Base Frequency (E) 1.7 GHz 1.2 GHz
Turbo Boost Frequency (E) 4.2 GHz 3.7 GHz
Total
Total Cores 12 10
Total Threads 14 12
Bus Frequency 100 MHz 100 MHz
Multiplier 20x 17x
L1 Cache 112K (per core) 80K (per core)
L2 Cache 2MB (per core) 1280K (per core)
L3 Cache 12MB (shared) 12MB (shared)
Unlocked Multiplier No No

Package

Fabrication Process 3 nm 10 nm
TDP (PL1) 12-15 W (configurable) 12-15 W (configurable)
Max. Boost TDP (PL2) 57 W 55 W
Socket FCBGA-2049 BGA-1744
Peak Temperature 110°C 100°C

iGPU

Integrated Graphics Arc Graphics (4-Cores) Intel Iris Xe Graphics (96EU)
GPU Base Clock 300 MHz 300 MHz
GPU Boost Clock 2100 MHz 1300 MHz
Shading Units 512 768
TMUs 32 48
ROPs 16 24
Execution Units 64 96
TGP 14 W 15 W
iGPU FLOPS
Core Ultra 7 255U +10%
2.2 TFLOPS
Core i7 1355U
2 TFLOPS
More info: Iris Xe Graphics G7 (96EU) compared to Arc iGPU (4-Cores)

Memory Support

Memory Types - LPDDR5-8400
- LPDDR5x-8400
- DDR5-6400		 - DDR5-5200
- DDR4-3200
- LPDDR5-6400
- LPDDR5x-6400
- LPDDR4x-4267
Max. Memory Size 128 GB 96 GB
Memory Channels 2 2
ECC Support No No

Misc

Official Site Intel Core Ultra 7 255U official page Intel Core i7 1355U official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 20

Cast your vote

Choose between two processors
9 (90%)
1 (10%)
Total votes: 10

Competitors

1. Intel Core Ultra 7 255U vs Intel Core Ultra 7 265U
2. Intel Core Ultra 7 255U vs Intel Core Ultra 7 155U
3. Intel Core Ultra 7 255U vs Intel Core Ultra 7 255H
4. Intel Core Ultra 7 255U vs Intel Core 7 150U
5. Intel Core i7 1355U vs AMD Ryzen 5 7530U
6. Intel Core i7 1355U vs Intel Core 7 150U (2)
7. Intel Core i7 1355U vs AMD Ryzen 7 7730U
8. Intel Core i7 1355U vs Intel Core i7 13700H (1)
9. Intel Core i7 1355U vs Intel Core i7 1255U (1)
10. Intel Core i7 1355U vs Intel Core Ultra 7 155U (1)
Compare other CPUs (460+)

Comments

So which CPU will you choose: Intel Core i7 1355U or Ultra 7 255U?
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