Intel Core Ultra 7 255H vs Intel Core Ultra X9 378H
69.7Single-core57.1
56.8Multi-core60.7
75.7Efficiencyspec-based81.4
75.9iGPU88.7
60.5Platformspec-based56.4
6 spec wins — Intel Core Ultra 7 255H6 spec wins — Intel Core Ultra X9 378H
InnoReviews verdict
This one is close to a dead heat: Intel Core Ultra 7 255H scores 65.3 against 65.1 for Intel Core Ultra X9 378H. Pick by the categories that matter to you — Intel Core Ultra 7 255H edges ahead in single-core, or by price.
Which would you pick?
Key differences
Reasons to pick the Intel Core Ultra 7 255H
- Stronger single-core score: 70 vs 57
- 50% higher Performance cores: 6 vs 4
- 44% higher Max TDP: 115 W vs 80 W
- 33% higher L3 cache: 24 MB vs 18 MB
- 33% higher Max memory: 128 GB vs 96 GB
Reasons to pick the Intel Core Ultra X9 378H
- Stronger multi-core score: 61 vs 57
- Stronger iGPU score: 89 vs 76
- 78% higher 3DMark Time Spy Graphics (iGPU): 6,627 vs 3,719
- 33% lower process: 2 nm vs 3 nm
- 20% higher Efficiency cores: 12 vs 10
General
| Spec | Intel Core Ultra 7 255H | Intel Core Ultra X9 378H |
|---|---|---|
| Announced | 2025 | 2026 |
| Process | 3 nm | 2 nm+33% |
| Base TDP | 28 W | 25 W+11% |
| Max TDP | 115 W+44% | 80 W |
Cores & Clocks
| Spec | Intel Core Ultra 7 255H | Intel Core Ultra X9 378H |
|---|---|---|
| Cores | 16 | 16 |
| Performance cores | 6+50% | 4 |
| Efficiency cores | 10 | 12+20% |
| Threads | 16 | 16 |
| Base clock | 2 GHz | 2 GHz |
| Boost clock | 5.1 GHz+2% | 5 GHz |
| L3 cache | 24 MB+33% | 18 MB |
Integrated GPU
| Spec | Intel Core Ultra 7 255H | Intel Core Ultra X9 378H |
|---|---|---|
| iGPU | Intel Arc 140T | Intel Arc B390 |
| iGPU clock | 2,250 MHz | 2,500 MHz |
Memory
| Spec | Intel Core Ultra 7 255H | Intel Core Ultra X9 378H |
|---|---|---|
| Memory support | LPDDR5X-8400 / DDR5-6400 | LPDDR5X-9600 |
| Max memory | 128 GB+33% | 96 GB |
Benchmarks
| Spec | Intel Core Ultra 7 255H | Intel Core Ultra X9 378H |
|---|---|---|
| Geekbench 6 (single) | 2,851Top 25% | — |
| Geekbench 6 (multi) | 15,362Top 19% | — |
| Cinebench R23 (single) | 2,055Top 13% | — |
| Cinebench R23 (multi) | 18,624Top 24% | — |
| PassMark | 30,782Top 25% | 33,002+7%Top 22% |
| PassMark (single thread) | 4,310+13%Top 12% | 3,799Top 40% |
| 3DMark Time Spy Graphics (iGPU) | 3,719Top 9% | 6,627+78%Top 4% |
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