Home > CPU Comparison > Core Ultra 7 255U or Core i5 1155G7: what's better?

Intel Core Ultra 7 255U vs i5 1155G7

54 out of 100
Intel Core Ultra 7 255U
VS
39 out of 100
Intel Core i5 1155G7
Intel Core Ultra 7 255U
Intel Core i5 1155G7

We compared two laptop CPUs: the 2.0 GHz Intel Core Ultra 7 255U with 12-cores against the 1.0-2.5 GHz i5 1155G7 with 4-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.
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Key Differences

What are the key differences between 1155G7 and 255U
Advantages of Intel Core Ultra 7 255U
  • More modern manufacturing process – 3 versus 10 nanometers
  • Newer - released 3 years and 8 months later
  • Has 8 more physical cores
  • Supports up to 128 GB LPDDR5-8400 RAM
  • Has 4 MB larger L3 cache size
  • More powerful Arc Graphics (4-Cores) integrated graphics: 2.2 vs 1.7 TFLOPS
  • 16% higher Turbo Boost frequency (5.2 GHz vs 4.5 GHz)
  • 24% faster in a single-core Geekbench v6 test - 2450 vs 1983 points
  • More than 10° C higher critical temperature

Test in Benchmarks

Comparing the performance of CPUs across various tasks
CPU:
Core Ultra 7 255U
vs
Core i5 1155G7

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 433.2 MB/sec
Clang compilation 75.6 Klines/sec 34.2 Klines/sec
HTML 5 Browser 267.7 pages/sec 105.9 pages/sec
PDF Renderer 334.8 Mpixels/sec 153.1 Mpixels/sec
Text processing 240.5 pages/sec 194.7 pages/sec
Background blur 46.6 images/sec 28 images/sec
Photo processing 80.8 images/sec 48.1 images/sec
Ray tracing 12 Mpixels/sec 6.79 Mpixels/sec
Sources: GeekBench [1], [2] – 1137 samples

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Integer math 65.3 GOps/sec 34.4 GOps/sec
Floating point math 45.7 GOps/sec 20 GOps/sec
Find prime numbers 63M Primes/sec 37M Primes/sec
Random string sorting 21.3M Strings/sec 12.5M Strings/sec
Data encryption 12.4 GBytes/sec 5.3 GBytes/sec
Data compression 196.1 MBytes/sec 104.6 MBytes/sec
Physics 1137 Frames/sec 557 Frames/sec
Extended instructions 10.8B Matrices/sec 7.1B Matrices/sec
Sources: PassMark [3], [4] – 649 & 1001 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 8.2 PPW
Geekbench 6 Multi / Watt 670.5 PPW 193 PPW
Passmark CPU Mark / Watt 1191.6 PPW 342.4 PPW
Blender / Watt - 1.76 PPW
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.

Specifications

Full technical specification of Intel Core Ultra 7 255U and i5 1155G7

General

Vendor Intel Intel
Released January 6, 2025 June 8, 2021
Type Laptop Laptop
Instruction Set x86-64 x86-64
Codename Arrow Lake Tiger Lake
Model number 255U i5-1155G7
Integrated GPU Arc Graphics (4-Cores) Iris Xe Graphics G7 80EU
Successor - - Intel Core Ultra 7 255U
Intel CPU rating (#120th place)

CPU

Performance Cores
P-Cores 2 4
P-Threads 4 8
Base Frequency (P) 2.0 GHz 1.0-2.5 GHz
Turbo Boost Frequency (P) 5.2 GHz 4.5 GHz
Efficient Cores
E-Cores 10 -
E-Threads 10 -
Base Frequency (E) 1.7 GHz -
Turbo Boost Frequency (E) 4.2 GHz -
Total
Total Cores 12 4
Total Threads 14 8
Bus Frequency 100 MHz 100 MHz
Multiplier 20x 10-25x
Bus Bandwidth - 4 GT/s
L1 Cache 112K (per core) 96K (per core)
L2 Cache 2MB (per core) 1280K (per core)
L3 Cache 12MB (shared) 8MB (shared)
Unlocked Multiplier No No

Package

Fabrication Process 3 nm 10 nm
TDP (PL1) 12-15 W (configurable) 12-28 W (configurable)
Max. Boost TDP (PL2) 57 W -
Socket FCBGA-2049 BGA-1449
Peak Temperature 110°C 100°C

iGPU

Integrated Graphics Arc Graphics (4-Cores) Iris Xe Graphics G7 80EU
GPU Base Clock 300 MHz 300 MHz
GPU Boost Clock 2100 MHz 1350 MHz
Shading Units 512 640
TMUs 32 40
ROPs 16 20
Execution Units 64 80
TGP 14 W 15 W
iGPU FLOPS
Core Ultra 7 255U +29%
2.2 TFLOPS
Core i5 1155G7
1.7 TFLOPS
More info: Iris Xe Graphics G7 (80EU) compared to Arc iGPU (4-Cores)

Memory Support

Memory Types - LPDDR5-8400
- LPDDR5x-8400
- DDR5-6400		 - DDR4-3200
- LPDDR4x-4267
Max. Memory Size 128 GB 64 GB
Memory Channels 2 2
ECC Support No No

Misc

Official Site Intel Core Ultra 7 255U official page Intel Core i5 1155G7 official page
PCI Express Version 4.0 4.0
PCI Express Lanes 20 16

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Comments

So which CPU will you choose: Intel Core i5 1155G7 or Ultra 7 255U?
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