Intel Core Ultra 7 251HX vs Intel Core Ultra 7 255U processor comparison: performance score, cores and clock speeds, cache, TDP, integrated graphics and NPU. The better value in each row is highlighted in green.
Summary
Intel Core Ultra 7 251HX offers more cores (18 vs 12), more threads (18 vs 14), more L3 cache (30 MB vs 12 MB), a smaller manufacturing process (TSMC N3B (3 nm) vs Intel 3 (7 nm)), and higher AI performance (30 vs 24 TOPS). Intel Core Ultra 7 255U offers a higher clock speed (5.2 GHz vs 5.1 GHz), a lower TDP (15 W vs 55 W), and more integrated graphics units (4 vs 3).
Performance score
0
Coming soon
0
Coming soon
Key specs
Cores & Threads18/18
Cores & Threads12/14
Turbo5.1 GHz
Turbo5.2 GHz
L3 cache30 MB
L3 cache12 MB
TDP55 W
TDP15 W
iGPUIntel Graphics
iGPUIntel Graphics
General
SeriesSeries 2
SeriesSeries 2
CodenameArrow Lake
CodenameArrow Lake
CPU architectureLion Cove, Skymont
CPU architectureRedwood Cove, Crestmont
FoundryTSMC
FoundryIntel
Process nodeTSMC N3B (3 nm)
Process nodeIntel 3 (7 nm)
Instruction setx86-64
Instruction setx86-64
Release dateJanuary 6, 2026
Release dateJanuary 6, 2025
Cores and clocks
Cores & Threads18/18
Cores & Threads12/14
6× P-cores
- Turbo clock
- 5.1 GHz
- Base clock
- 2.9 GHz
2× P-cores
- Turbo clock
- 5.2 GHz
- Base clock
- 2.0 GHz
12× E-cores
- Turbo clock
- 4.5 GHz
- Base clock
- 2.5 GHz
8× E-cores
- Turbo clock
- 4.2 GHz
- Base clock
- 1.7 GHz
2× LPE-cores
- Turbo clock
- 2.4 GHz
- Base clock
- 0.7 GHz
Cache
L3 cache30 MB
L3 cache12 MB
L2 cache30 MB
L2 cache10 MB
L1 cache2688 KB
L1 cache1184 KB
TDP
TDP55 W
TDP15 W
Min. - Max.45 - 160 W
Min. - Max.12 - 57 W
Max temperature105 °C
Max temperature110 °C
Connectivity
Memory supportDDR5-6400
Memory supportLPDDR5x-8400LPDDR5-8400DDR5-6400
Memory channels2
Memory channels2
PCIe version5.0, 4.0
PCIe version4.0
PCIe lanes20, 4
PCIe lanes20
Graphics
ModelIntel Graphics
ModelIntel Graphics
iGPU architectureXe-LPG
iGPU architectureXe-LPG
Execution units3
Execution units4
Clock1800 MHz
Clock2100 MHz
AI
Total TOPS30
Total TOPS24
NPU TOPS13
NPU TOPS12
iGPU TOPS6
iGPU TOPS8