Home > CPU Comparison > Core Ultra 7 251HX or Ryzen 7 H 255: what's better?

Intel Core Ultra 7 251HX vs AMD Ryzen 7 H 255

75 out of 100
Intel Core Ultra 7 251HX
VS
61 out of 100
AMD Ryzen 7 H 255
Intel Core Ultra 7 251HX
AMD Ryzen 7 H 255

We compared two laptop CPUs: the 2.9 GHz Intel Core Ultra 7 251HX with 18-cores against the 3.8 GHz AMD Ryzen 7 H 255 with 8-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 255 and 251HX
Advantages of Intel Core Ultra 7 251HX
  • Newer - released 8 months later
  • Has 10 more physical cores
  • Unlocked multiplier
  • Has 14 MB larger L3 cache size, helping fully utilize a high-end GPU in gaming
  • More modern manufacturing process – 3 versus 4 nanometers
  • Newer PCI Express version – 5.0
  • 15% faster in a single-core Geekbench v6 test - 2940 vs 2551 points
  • 4% higher Turbo Boost frequency (5.1 GHz vs 4.9 GHz)
Advantages of AMD Ryzen 7 H 255
  • More powerful Radeon 780M integrated graphics: 4 vs 1.8 TFLOPS

Test in Benchmarks

Comparing the performance of CPUs across various tasks
CPU:
Core Ultra 7 251HX
vs
Ryzen 7 H 255

Cinebench

Reputable cross-platform benchmark for high-performance processors
Cinebench 2024 (Single)
Cinebench 2024 (Multi)
Cinebench Scores (46th and 177th place)
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 - 1020 MB/sec
Clang compilation - 99.8 Klines/sec
HTML 5 Browser - 255.5 pages/sec
PDF Renderer - 378.2 Mpixels/sec
Text processing - 259.2 pages/sec
Background blur - 61.1 images/sec
Photo processing - 99.7 images/sec
Ray tracing - 21.5 Mpixels/sec
Sources: GeekBench [1], [2]

PassMark

Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
Integer math 122 GOps/sec 96 GOps/sec
Floating point math 152.1 GOps/sec 59.2 GOps/sec
Find prime numbers 440M Primes/sec 85M Primes/sec
Random string sorting 61.6M Strings/sec 41.8M Strings/sec
Data encryption 39.2 GBytes/sec 20.3 GBytes/sec
Data compression 512.7 MBytes/sec 344.3 MBytes/sec
Physics 2500 Frames/sec 1349 Frames/sec
Extended instructions 39.9B Matrices/sec 25.6B Matrices/sec
Sources: PassMark [3], [4] – 10 & 375 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 32 PPW 17.1 PPW
Geekbench 6 Multi / Watt 277.8 PPW 234.6 PPW
Passmark CPU Mark / Watt 849.6 PPW 520.6 PPW
Blender / Watt - 4.1 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 251HX and AMD Ryzen 7 H 255

General

Vendor Intel Amd
Released April 1, 2026 August 4, 2025
Type Laptop Laptop
Instruction Set x86-64 x86-64
Codename Arrow Lake Zen 4 (Hawk Point)
Model number 251HX -
Integrated GPU Arc Graphics (4-Cores) Radeon 780M
Intel CPU rating (#27th place)
AMD Ryzen CPU ranking (#55th place)

CPU

Performance Cores
P-Cores 6 8
P-Threads 6 16
Base Frequency (P) 2.9 GHz 3.8 GHz
Turbo Boost Frequency (P) 5.1 GHz 4.9 GHz
Efficient Cores
E-Cores 12 -
E-Threads 12 -
Base Frequency (E) 2.5 GHz -
Turbo Boost Frequency (E) 4.5 GHz -
Total
Total Cores 18 8
Total Threads 18 16
Bus Frequency 100 MHz 100 MHz
Multiplier 29x 38x
L1 Cache 192K (per core) 64K (per core)
L2 Cache 2MB (per core) 1MB (per core)
L3 Cache 30MB (shared) 16MB (shared)
Unlocked Multiplier Yes No

Package

Transistors - 25 billions
Fabrication Process 3 nm 4 nm
TDP (PL1) 45-55 W (configurable) 35-54 W (configurable)
Max. Boost TDP (PL2) 160 W -
Socket FCBGA-2114 FP8
Peak Temperature 105°C 100°C
Laptop processors ranking (30th and 85th place)

iGPU

Integrated Graphics Arc Graphics (4-Cores) Radeon 780M
GPU Base Clock 300 MHz 800 MHz
GPU Boost Clock 1800 MHz 2600 MHz
Shading Units 512 768
TMUs 32 48
ROPs 16 32
Execution Units 64 12
TGP 14 W 15 W
iGPU FLOPS
Core Ultra 7 251HX
1.8 TFLOPS
Ryzen 7 H 255 +122%
4 TFLOPS
More info: Radeon 780M compared to Arc iGPU (4-Cores)

Memory Support

Memory Types - DDR5-6400 - DDR5-5600
- LPDDR5x-7500
Max. Memory Size 256 GB 256 GB
Memory Channels 2 2
Max. Memory Bandwidth 102.4 GB/s -
ECC Support No No

Misc

Official Site Intel Core Ultra 7 251HX official page -
PCI Express Version 5.0 4.0
PCI Express Lanes 24 20

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7. AMD Ryzen 7 H 255 vs AMD Ryzen 7 8845HS
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Comments

So which CPU will you choose: AMD Ryzen 7 H 255 or Intel Core Ultra 7 251HX?
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