Intel Core Ultra 7 251HX vs Intel Core Ultra 7 255HX
66.6Single-core72.8
65.1Multi-core73.8
44.4Efficiencyspec-based44.4
68.1Platformspec-based69.6
2 spec wins — Intel Core Ultra 7 251HX9 spec wins — Intel Core Ultra 7 255HX
InnoReviews verdict
Intel Core Ultra 7 255HX wins this laptop processor face-off, 67.9 to 62.6, pulling ahead mainly in multi-core (+9) and single-core (+6). Intel Core Ultra 7 251HX still makes sense if its price or standout specs fit your needs better.
Which would you pick?
Key differences
Reasons to pick the Intel Core Ultra 7 251HX
- 21% higher Base clock: 2.9 GHz vs 2.4 GHz
Reasons to pick the Intel Core Ultra 7 255HX
- Stronger single-core score: 73 vs 67
- Stronger multi-core score: 74 vs 65
- 33% higher Performance cores: 8 vs 6
- 26% higher Geekbench 6 (multi): 17,915 vs 14,233
- 22% higher Cinebench R23 (multi): 31,781 vs 26,001
General
| Spec | Intel Core Ultra 7 251HX | Intel Core Ultra 7 255HX |
|---|---|---|
| Announced | 2026 | 2025 |
| Process | 3 nm | 3 nm |
| Base TDP | 55 W | 55 W |
| Max TDP | 160 W | 160 W |
Cores & Clocks
| Spec | Intel Core Ultra 7 251HX | Intel Core Ultra 7 255HX |
|---|---|---|
| Cores | 18 | 20+11% |
| Performance cores | 6 | 8+33% |
| Efficiency cores | 12 | 12 |
| Threads | 18 | 20+11% |
| Base clock | 2.9 GHz+21% | 2.4 GHz |
| Boost clock | 5.1 GHz | 5.2 GHz+2% |
| L3 cache | 30 MB | 30 MB |
Integrated GPU
| Spec | Intel Core Ultra 7 251HX | Intel Core Ultra 7 255HX |
|---|---|---|
| iGPU | Intel Graphics (3 Xe) | Intel Graphics (4 Xe-cores) |
| iGPU clock | 1,800 MHz | 1,850 MHz |
Memory
| Spec | Intel Core Ultra 7 251HX | Intel Core Ultra 7 255HX |
|---|---|---|
| Memory support | DDR5-6400 | DDR5-6400 |
| Max memory | 256 GB | 256 GB |
Benchmarks
| Spec | Intel Core Ultra 7 251HX | Intel Core Ultra 7 255HX |
|---|---|---|
| Geekbench 6 (single) | 2,762Top 30% | 2,959+7%Top 17% |
| Geekbench 6 (multi) | 14,233Top 28% | 17,915+26%Top 12% |
| Cinebench R23 (single) | 1,941Top 26% | 2,154+11%Top 10% |
| Cinebench R23 (multi) | 26,001Top 12% | 31,781+22%Top 6% |
| PassMark | 47,051Top 8% | 47,933+2%Top 8% |
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