Intel Core Ultra 7 255HX vs Ultra 7 251HX
75
out of 100
VS
75
out of 100
We compared two laptop CPUs: the 2.4 GHz Intel Core Ultra 7 255HX with 20-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 255HX
- Has 2 more physical cores
- 2% higher Turbo Boost frequency (5.2 GHz vs 5.1 GHz)
Advantages of Intel Core Ultra 7 251HX
- Newer - released 1 year and 3 months later
Test in Benchmarks
Comparing the performance of CPUs across various tasksCinebench
Cinebench 2024 (Single)
Cinebench 2024 (Multi)
Cinebench Scores (47th and 46th place)
GeekBench v6
Geekbench 6 (Single-Core)
Geekbench 6 (Multi-Core)
| File compression | 1140 MB/sec | - |
| Clang compilation | 149.8 Klines/sec | - |
| HTML 5 Browser | 312.2 pages/sec | - |
| PDF Renderer | 423.9 Mpixels/sec | - |
| Text processing | 335.6 pages/sec | - |
| Background blur | 64.1 images/sec | - |
| Photo processing | 111.8 images/sec | - |
| Ray tracing | 31.1 Mpixels/sec | - |
PassMark
Passmark CPU (Single-Core)
Passmark CPU (Multi-Core)
| Integer math | 127 GOps/sec | 122 GOps/sec |
| Floating point math | 160.3 GOps/sec | 152.1 GOps/sec |
| Find prime numbers | 400M Primes/sec | 440M Primes/sec |
| Random string sorting | 62.4M Strings/sec | 61.6M Strings/sec |
| Data encryption | 39.4 GBytes/sec | 39.2 GBytes/sec |
| Data compression | 513.6 MBytes/sec | 512.7 MBytes/sec |
| Physics | 2916 Frames/sec | 2500 Frames/sec |
| Extended instructions | 41.1B Matrices/sec | 39.9B Matrices/sec |
Blender
Blender CPU
Performance Per Watt
| Cinebench 2024 / Watt | 32 PPW | 32 PPW |
| Geekbench 6 Multi / Watt | 328 PPW | 277.8 PPW |
| Passmark CPU Mark / Watt | 874.8 PPW | 849.6 PPW |
| Blender / Watt | 7.11 PPW | - |
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.
Recent User Tests
Intel Core Ultra 7 255HX
| Date | Benchmark | Result |
|---|---|---|
| π 2026-06-05 (Levi) | GeekBench | 2907 / 17742 |
| π 2025-12-25 (Junebug) | Cinebench 2024 | 131 / 1759 |
| π 2025-12-17 (balihardik009) | Cinebench 2024 | 131 / 1820 |
| π 2025-11-26 (Verbickisd) | Cinebench 2024 | 125 / 1666 |
| π 2025-11-24 (Abhi) | GeekBench | 2823 / 17264 |
Intel Core Ultra 7 251HX
No benchmark results yet
Specifications
Full technical specification of Intel Core Ultra 7 255HX 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 | 255HX | 251HX |
| Integrated GPU | Arc Graphics (4-Cores) | Arc Graphics (4-Cores) |
| Rival Equivalent | - AMD Ryzen AI Max Pro 380 | - |
Intel CPU rating (29th and 27th place)
CPU
| P-Cores | 8 | 6 |
| P-Threads | 8 | 6 |
| Base Frequency (P) | 2.4 GHz | 2.9 GHz |
| Turbo Boost Frequency (P) | 5.2 GHz | 5.1 GHz |
| E-Cores | 12 | 12 |
| E-Threads | 12 | 12 |
| Base Frequency (E) | 1.8 GHz | 2.5 GHz |
| Turbo Boost Frequency (E) | 4.5 GHz | 4.5 GHz |
| Total Cores | 20 | 18 |
| Total Threads | 20 | 18 |
| Bus Frequency | 100 MHz | 100 MHz |
| Multiplier | 24x | 29x |
| L1 Cache | 192K (per core) | 192K (per core) |
| L2 Cache | 2MB (per core) | 2MB (per core) |
| L3 Cache | 30MB (shared) | 30MB (shared) |
| Unlocked Multiplier | Yes | Yes |
Package
| Fabrication Process | 3 nm | 3 nm |
| TDP (PL1) | 45-55 W (configurable) | 45-55 W (configurable) |
| Max. Boost TDP (PL2) | 160 W | 160 W |
| Socket | FCBGA-2114 | FCBGA-2114 |
| Peak Temperature | 105Β°C | 105Β°C |
Laptop processors ranking (33rd and 30th place)
iGPU
| Integrated Graphics | Arc Graphics (4-Cores) | Arc Graphics (4-Cores) |
| GPU Base Clock | 300 MHz | 300 MHz |
| GPU Boost Clock | 1850 MHz | 1800 MHz |
| Shading Units | 512 | 512 |
| TMUs | 32 | 32 |
| ROPs | 16 | 16 |
| Execution Units | 64 | 64 |
| TGP | 14 W | 14 W |
iGPU FLOPS
Memory Support
| Memory Types | - DDR5-6400 | - DDR5-6400 |
| Max. Memory Size | 256 GB | 256 GB |
| Memory Channels | 2 | 2 |
| Max. Memory Bandwidth | 102.4 GB/s | 102.4 GB/s |
| ECC Support | Yes | No |
Misc
| Official Site | Intel Core Ultra 7 255HX official page | Intel Core Ultra 7 251HX official page |
| PCI Express Version | 5.0 | 5.0 |
| PCI Express Lanes | 24 | 24 |
Cast your vote
Total votes: 5