Intel Core Ultra 7 255H vs Ultra 7 251HX
68
out of 100
VS
75
out of 100
We compared two laptop CPUs: the 2.0 GHz Intel Core Ultra 7 255H with 16-cores against the 2.9 GHz Ultra 7 251HX with 18-cores. On this page, you'll find out which processor has better performance in benchmarks, games and other useful information.
Review
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
Choose your main usage scenario to recalculate the Final Score and see which CPU suits your needs.
Key Differences
Advantages of Intel Core Ultra 7 255H
- More powerful Arc Graphics 140T integrated graphics: 4.6 vs 1.8 TFLOPS
Advantages of Intel Core Ultra 7 251HX
- Newer - released 1 year and 3 months later
- Unlocked multiplier
- Supports up to 256 GB DDR5-6400 RAM
- Has 6 MB larger L3 cache size, helping fully utilize a high-end GPU in gaming
- Has 2 more physical cores
Test in Benchmarks
Comparing the performance of CPUs across various tasksCinebench
Cinebench 2024 (Single)
Cinebench 2024 (Multi)
Cinebench Scores (141st and 46th place)
GeekBench v6
Geekbench 6 (Single-Core)
Geekbench 6 (Multi-Core)
| File compression | 1270 MB/sec | - |
| Clang compilation | 103.2 Klines/sec | - |
| HTML 5 Browser | 399 pages/sec | - |
| PDF Renderer | 443.6 Mpixels/sec | - |
| Text processing | 283.7 pages/sec | - |
| Background blur | 62.4 images/sec | - |
| Photo processing | 144.8 images/sec | - |
| Ray tracing | 24 Mpixels/sec | - |
PassMark
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
| Integer math | 78.1 GOps/sec | 122 GOps/sec |
| Floating point math | 98.9 GOps/sec | 152.1 GOps/sec |
| Find prime numbers | 303M Primes/sec | 440M Primes/sec |
| Random string sorting | 36.1M Strings/sec | 61.6M Strings/sec |
| Data encryption | 23.4 GBytes/sec | 39.2 GBytes/sec |
| Data compression | 299.1 MBytes/sec | 512.7 MBytes/sec |
| Physics | 2251 Frames/sec | 2500 Frames/sec |
| Extended instructions | 23.8B Matrices/sec | 39.9B Matrices/sec |
Blender
Blender CPU
Performance Per Watt
| Cinebench 2024 / Watt | 37.5 PPW | 32 PPW |
| Geekbench 6 Multi / Watt | 540.1 PPW | 277.8 PPW |
| Passmark CPU Mark / Watt | 1097.3 PPW | 849.6 PPW |
| Blender / Watt | 9.83 PPW | - |
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.
Recent User Tests
Intel Core Ultra 7 255H
| Date | Benchmark | Result |
|---|---|---|
| π 2026-09-06 -> xnullcode | GeekBench | 3009 / 11440 |
| π 2026-08-15 -> xnullcode | GeekBench | 2849 / 11877 |
| π 2026-08-15 -> xnullcode | GeekBench | 2848 / 11898 |
| π 2026-08-15 -> xnullcode | Cinebench 2026 | 0 / 3496 |
| π 2026-08-15 (xnullcode) | GeekBench | 2708 / 11477 |
Intel Core Ultra 7 251HX
No benchmark results yet
Specifications
Full technical specification of Intel Core Ultra 7 255H and Ultra 7 251HXGeneral
| Vendor | Intel | Intel |
| Released | January 6, 2025 | April 1, 2026 |
| Type | Laptop | Laptop |
| Instruction Set | x86-64 | x86-64 |
| Codename | Arrow Lake | Arrow Lake |
| Model number | 255H | 251HX |
| Integrated GPU | Arc Graphics 140T | Arc Graphics (4-Cores) |
| Rival Equivalent | - AMD Ryzen AI 7 350 | - |
Intel CPU rating (50th and 27th place)
CPU
| P-Cores | 6 | 6 |
| P-Threads | 6 | 6 |
| Base Frequency (P) | 2.0 GHz | 2.9 GHz |
| Turbo Boost Frequency (P) | 5.1 GHz | 5.1 GHz |
| E-Cores | 10 | 12 |
| E-Threads | 10 | 12 |
| Base Frequency (E) | 1.5 GHz | 2.5 GHz |
| Turbo Boost Frequency (E) | 4.4 GHz | 4.5 GHz |
| Total Cores | 16 | 18 |
| Total Threads | 16 | 18 |
| Bus Frequency | 100 MHz | 100 MHz |
| Multiplier | 20x | 29x |
| L1 Cache | 192K (per core) | 192K (per core) |
| L2 Cache | 2MB (per core) | 2MB (per core) |
| L3 Cache | 24MB (shared) | 30MB (shared) |
| Unlocked Multiplier | No | Yes |
Package
| Fabrication Process | 3 nm | 3 nm |
| TDP (PL1) | 20-28 W (configurable) | 45-55 W (configurable) |
| Max. Boost TDP (PL2) | 115 W | 160 W |
| Socket | FCBGA-2049 | FCBGA-2114 |
| Peak Temperature | 110Β°C | 105Β°C |
Laptop processors ranking (60th and 30th place)
iGPU
| Integrated Graphics | Arc Graphics 140T | Arc Graphics (4-Cores) |
| GPU Base Clock | 300 MHz | 300 MHz |
| GPU Boost Clock | 2250 MHz | 1800 MHz |
| Shading Units | 1024 | 512 |
| TMUs | 64 | 32 |
| ROPs | 32 | 16 |
| Execution Units | 8 | 64 |
| TGP | 35 W | 14 W |
iGPU FLOPS
More info: Arc iGPU (4-Cores) compared to Arc 140T
Memory Support
| Memory Types | - LPDDR5-8400 - LPDDR5x-8400 - DDR5-6400 |
- DDR5-6400 |
| Max. Memory Size | 128 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 255H official page | Intel Core Ultra 7 251HX official page |
| PCI Express Version | 5.0 | 5.0 |
| PCI Express Lanes | 28 | 24 |
Cast your vote
Total votes: < 1