Intel Core Ultra 7 251HX vs Intel Core Ultra 7 255H 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 16), more threads (18 vs 16), and more L3 cache (30 MB vs 24 MB). Intel Core Ultra 7 255H offers a lower TDP (28 W vs 55 W), more integrated graphics units (8 vs 3), and higher AI performance (96 vs 30 TOPS).
Performance score
0
Coming soon
0
Coming soon
Key specs
Cores & Threads18/18
Cores & Threads16/16
Turbo5.1 GHz
Turbo5.1 GHz
L3 cache30 MB
L3 cache24 MB
TDP55 W
TDP28 W
iGPUIntel Graphics
iGPUIntel Arc 140T
General
SeriesSeries 2
SeriesSeries 2
CodenameArrow Lake
CodenameArrow Lake
CPU architectureLion Cove, Skymont
CPU architectureLion Cove, Skymont
FoundryTSMC
FoundryTSMC
Process nodeTSMC N3B (3 nm)
Process nodeTSMC N3B (3 nm)
Instruction setx86-64
Instruction setx86-64
Release dateJanuary 6, 2026
Release dateJanuary 6, 2025
Cores and clocks
Cores & Threads18/18
Cores & Threads16/16
6× P-cores
- Turbo clock
- 5.1 GHz
- Base clock
- 2.9 GHz
6× P-cores
- Turbo clock
- 5.1 GHz
- Base clock
- 2.0 GHz
12× E-cores
- Turbo clock
- 4.5 GHz
- Base clock
- 2.5 GHz
8× E-cores
- Turbo clock
- 4.4 GHz
- Base clock
- 1.5 GHz
2× LPE-cores
- Turbo clock
- 2.5 GHz
- Base clock
- 0.7 GHz
Cache
L3 cache30 MB
L3 cache24 MB
L2 cache30 MB
L2 cache28 MB
L1 cache2688 KB
L1 cache2496 KB
TDP
TDP55 W
TDP28 W
Min. - Max.45 - 160 W
Min. - Max.20 - 115 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 version5.0, 4.0
PCIe lanes20, 4
PCIe lanes8, 20
Graphics
ModelIntel Graphics
ModelIntel Arc 140T
iGPU architectureXe-LPG
iGPU architectureXe-LPG+
Execution units3
Execution units8
Clock1800 MHz
Clock2250 MHz
AI
Total TOPS30
Total TOPS96
NPU TOPS13
NPU TOPS13
iGPU TOPS6
iGPU TOPS74