Intel Core Ultra 7 251HX vs Intel Core Ultra 7 255HX 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 255HX offers more cores (20 vs 18), more threads (20 vs 18), a higher clock speed (5.2 GHz vs 5.1 GHz), more integrated graphics units (4 vs 3), and higher AI performance (33 vs 30 TOPS).
Performance score
0
Coming soon
0
Coming soon
Key specs
Cores & Threads18/18
Cores & Threads20/20
Turbo5.1 GHz
Turbo5.2 GHz
L3 cache30 MB
L3 cache30 MB
TDP55 W
TDP55 W
iGPUIntel Graphics
iGPUIntel Graphics
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 & Threads20/20
6× P-cores
- Turbo clock
- 5.1 GHz
- Base clock
- 2.9 GHz
8× P-cores
- Turbo clock
- 5.2 GHz
- Base clock
- 2.4 GHz
12× E-cores
- Turbo clock
- 4.5 GHz
- Base clock
- 2.5 GHz
12× E-cores
- Turbo clock
- 4.5 GHz
- Base clock
- 1.8 GHz
Cache
L3 cache30 MB
L3 cache30 MB
L2 cache30 MB
L2 cache36 MB
L1 cache2688 KB
L1 cache3200 KB
TDP
TDP55 W
TDP55 W
Min. - Max.45 - 160 W
Min. - Max.45 - 160 W
Max temperature105 °C
Max temperature105 °C
Connectivity
Memory supportDDR5-6400
Memory supportDDR5-6400
Memory channels2
Memory channels2
PCIe version5.0, 4.0
PCIe version5.0, 4.0
PCIe lanes20, 4
PCIe lanes20, 4
Graphics
ModelIntel Graphics
ModelIntel Graphics
iGPU architectureXe-LPG
iGPU architectureXe-LPG
Execution units3
Execution units4
Clock1800 MHz
Clock1850 MHz
AI
Total TOPS30
Total TOPS33
NPU TOPS13
NPU TOPS13
iGPU TOPS6
iGPU TOPS8