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Intel Core Ultra 7 251HX

Intel Ultra 7 251HX

The Intel Core Ultra 7 251HX is a mobile high-end CPU for gaming notebooks based on the Arrow Lake architecture. It offers 18 cores consisting of 6 of the 8 fast performance cores with up to 5.1 GHz and 12 of the 16 smaller efficiency cores with up to 4.5 GHz clock speed. The CPU has access to 30 MB L2 cache and 30 MB L3 cache and is specified with a TDP of 45 watts.

The SoC integrates a small dedicated NPU called AI Boost with 13 TOPS (Int8) and does not support vPro. The integrated memory controller supports up to 256 GB DDR5-6400 (dual channel, ECC optional). The integrated GPU (iGPU) is a small Intel Graphics graphics card with four Xe cores running at 300 - 1800 MHz.

Performance - High End

Due to the 18 cores and the high clock rate, the performance should be between Core Ultra 7 245HX and Ultra 7 255HX in the high-end range of mobile CPUs. The performance should therefore be sufficient for all demanding applications and games in 2016.

Production - TSMC and Foveros

The Arrow Lake-HX chips are based on the desktop Arrow Lake-S chips and are composed of several chiplets. The CPU part is manufactured at TSMC using the modern N3B (3nm) process. The GPU also comes from TSMC in the N5P process. The SoC and I/O tile are manufactured in the TSMC N6 process. The base tile is manufactured by Intel in the 22nm process and carries the individual chiplets thanks to Fovero's 3D packaging.

CodenameArrow Lake-HX
SeriesIntel Arrow Lake

Series: Arrow Lake Arrow Lake-HX

Intel Core Ultra 9 290HX Plus compare1.8 - 5.5 GHz24 / 24 cores36 MB L3
Intel Core Ultra 9 285HX compare2.1 - 5.5 GHz24 / 24 cores36 MB L3
Intel Core Ultra 9 275HX compare2.1 - 5.4 GHz24 / 24 cores36 MB L3
Intel Core Ultra 7 270HX Plus compare1.8 - 5.3 GHz20 / 20 cores36 MB L3
Intel Core Ultra 7 265HX compare2.3 - 5.3 GHz20 / 20 cores36 MB L3
Intel Core Ultra 7 255HX compare2.3 - 5.2 GHz20 / 20 cores36 MB L3
Intel Core Ultra 7 251HX « 2.5 - 5.1 GHz18 / 18 cores30 MB L3
Intel Core Ultra 5 235HX compare2.6 - 5.1 GHz14 / 14 cores26 MB L3
Intel Core Ultra 5 245HX compare2.6 - 5.1 GHz14 / 14 cores26 MB L3
Intel Core 7 245HX compare2.6 - 5.1 GHz14 / 14 cores26 MB L3
Clock Rate2500 - 5100 MHz
Level 2 Cache30 MB
Level 3 Cache30 MB
Number of Cores / Threads18 / 18
6 x 5.1 GHz Intel Lion Cove P-Core
12 x 4.5 GHz Intel Skymont E-Core
Power Consumption (TDP = Thermal Design Power)45 Watt
TDP Turbo PL2160 Watt
Manufacturing Technology3 nm
GPUIntel Graphics 4-Core iGPU (Meteor / Arrow Lake) (300 - 1800 MHz)
NPU / AI13 TOPS INT8
Chip AI30 TOPS INT8
64 Bit64 Bit support
Architecturex86
Announcement Date04/01/2026
Product Link (external)www.intel.com

Benchmarks

Cinebench 2026 - Cinebench 2026 CPU Single Thread
465 Points (63%)
+ 1 benchmarks and specifications   + Show comparison chart
Cinebench 2026 - Cinebench 2026 CPU Multi
5614 Points (55%)
+ 1 benchmarks and specifications   + Show comparison chart
Cinebench 2024 - Cinebench 2024 CPU Single Core
117.7 Points (14%)
+ 1 benchmarks and specifications   + Show comparison chart
Cinebench 2024 - Cinebench 2024 CPU Multi Core
1407 Points (26%)
+ 1 benchmarks and specifications   + Show comparison chart
Cinebench R23 - Cinebench R23 Multi Core
26001 Points (24%)
+ 1 benchmarks and specifications   - Hide comparison chart
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Cinebench R23 - Cinebench R23 Single Core
1941 Points (79%)
+ 1 benchmarks and specifications   - Hide comparison chart
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Cinebench R20 - Cinebench R20 CPU (Single Core)
740 Points (80%)
+ 1 benchmarks and specifications   + Show comparison chart
Cinebench R20 - Cinebench R20 CPU (Multi Core)
10180 Points (25%)
+ 1 benchmarks and specifications   + Show comparison chart
Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
3972 Points (25%)
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0801602403204004805606407208008809601040112012001280136014401520160016801760184019202000208021602240232024002480256026402720280028802960304031203200328033603440352036003680376038403920Tooltip
Cinebench R15 - Cinebench R15 CPU Single 64 Bit
291 Points (80%)
+ 1 benchmarks and specifications   - Hide comparison chart
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7-Zip 18.03 - 7-Zip 18.03 Single Thread 4 runs
5798 MIPS (66%)
+ 1 benchmarks and specifications   + Show comparison chart
HWBOT x265 Benchmark v2.2 - HWBOT x265 4k Preset
28.4 fps (50%)
+ 1 benchmarks and specifications   + Show comparison chart
05101520253035Tooltip
Blender - Blender 3.3 Classroom CPU *
210 Seconds (3%)
+ 1 benchmarks and specifications   + Show comparison chart
Blender - Blender 2.79 BMW27 CPU *
129 Seconds (1%)
+ 1 benchmarks and specifications   + Show comparison chart
R Benchmark 2.5 - R Benchmark 2.5 *
0.4 sec (9%)
+ 1 benchmarks and specifications   + Show comparison chart
Geekbench 6.7 - Geekbench 6.7.1 Single-Core
2940 points (68%)
+ 2 benchmarks and specifications   + Show comparison chart
Geekbench 6.7 - Geekbench 6.7.1 Multi-Core
15277 points (52%)
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Restrict / Search: Model: Max. age: years
Geekbench 5.5 - Geekbench 5.1 - 5.5 64 Bit Single-Core
1989 points (67%)
+ 1 benchmarks and specifications   + Show comparison chart
Geekbench 5.5 - Geekbench 5.1 - 5.5 64 Bit Multi-Core
15507 points (28%)
+ 1 benchmarks and specifications   + Show comparison chart
Mozilla Kraken 1.1 - Kraken 1.1 Total Score *
442 ms (1%)
+ 1 benchmarks and specifications   + Show comparison chart
WebXPRT 4 - WebXPRT 4 Score
305 Points (76%)
+ 1 benchmarks and specifications   + Show comparison chart
WebXPRT 3 - WebXPRT 3 Score
335 Points (56%)
+ 1 benchmarks and specifications   + Show comparison chart
CrossMark - CrossMark Overall
1934 Points (68%)
+ 1 benchmarks and specifications   + Show comparison chart
Power Consumption - Prime95 Power Consumption - external Monitor *
140.9 Watt (24%)
+ 1 benchmarks and specifications   + Show comparison chart
05101520253035404550556065707580859095100105110115120125130135140145150Tooltip
Power Consumption - Idle Power Consumption - external Monitor *
7.5 Watt (5%)
+ 1 benchmarks and specifications   + Show comparison chart
0123456789Tooltip
Power Consumption - Idle Power Consumption 150cd 1min *
7.8 Watt (6%)
+ 1 benchmarks and specifications   + Show comparison chart
0123456789101112Tooltip
- Range of benchmark values
red legend - Average benchmark values
* Smaller numbers mean a higher performance

Amazon Logo
  • $1,899.99
    Lenovo Legion 5i 15.3" OLED WQXGA 165Hz Gaming Notebook Intel Core Ultra 7 251HX 16GB RAM 1TB SSD NVIDIA GeForce RTX 5060 Eclipse Black
  • $2,299.99
    Lenovo Legion 5i 15.3" OLED WQXGA 165Hz Gaming Notebook Intel Core Ultra 7 251HX 16GB RAM 1TB SSD NVIDIA GeForce RTX 5070 Eclipse Black
  • $1,219.99
    HP OmniBook 16" 2K Touchscreen Laptop | Intel Core Ultra 7 255U (Beats i9-10880H) | 32GB RAM | 2TB SSD | Intel Integrated Graphics | Win 11 | Fast Charge | Wi-Fi 7 | W/Mouse
  • $835.00
    HP 17.3" AI Laptop, Intel Core Ultra 7 255U, 16GB DDR5, 512GB SSD, HD Touchscreen, Backlit Keyboard, Windows 11 Pro, Wi-Fi 6, Natural Silver
  • $719.00
    HP New Core i7 15.6" Laptop | 2026 Edition | Intel High-Performance Core i7-1255U up to 4.7GHz | 16GB RAM - 1TB PCIe SSD | Webcam | FHD | Long Battery Life | Windows 11 | Business & Academic

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v1.35
log 28. 00:01:10

#0 ran 0s before starting gpusingle class +0s ... 0s

#1 no ids found in url (should be separated by "_") +0s ... 0s

#2 not redirecting to Ajax server +0s ... 0s

#3 did not recreate cache, as it is less than 5 days old! Created at Tue, 25 Aug 2026 05:33:24 +0200 +0.001s ... 0.002s

#4 composed specs +0.016s ... 0.017s

#5 did output specs +0s ... 0.017s

#6 getting avg benchmarks for device 21006 +0.007s ... 0.024s

#7 got single benchmarks 21006 +0.007s ... 0.032s

#8 got avg benchmarks for devices +0s ... 0.032s

#9 No cached benchmark found, getting uncached values +0.005s ... 0.037s

#10 No cached benchmark found, getting uncached values +0.027s ... 0.064s

#11 No cached benchmark found, getting uncached values +0.026s ... 0.089s

#12 No cached benchmark found, getting uncached values +0.027s ... 0.116s

#13 No cached benchmark found, getting uncached values +0.028s ... 0.144s

#14 No cached benchmark found, getting uncached values +0.029s ... 0.173s

#15 No cached benchmark found, getting uncached values +0.029s ... 0.203s

#16 No cached benchmark found, getting uncached values +0.029s ... 0.231s

#17 No cached benchmark found, getting uncached values +0.029s ... 0.26s

#18 No cached benchmark found, getting uncached values +0.033s ... 0.294s

#19 No cached benchmark found, getting uncached values +0.032s ... 0.325s

#20 No cached benchmark found, getting uncached values +0.03s ... 0.356s

#21 No cached benchmark found, getting uncached values +0.028s ... 0.383s

#22 No cached benchmark found, getting uncached values +0.027s ... 0.41s

#23 No cached benchmark found, getting uncached values +0.029s ... 0.439s

#24 No cached benchmark found, getting uncached values +0.097s ... 0.536s

#25 No cached benchmark found, getting uncached values +0.033s ... 0.569s

#26 No cached benchmark found, getting uncached values +0.033s ... 0.602s

#27 No cached benchmark found, getting uncached values +0.032s ... 0.633s

#28 No cached benchmark found, getting uncached values +0.027s ... 0.66s

#29 No cached benchmark found, getting uncached values +0.03s ... 0.69s

#30 No cached benchmark found, getting uncached values +0.03s ... 0.72s

#31 No cached benchmark found, getting uncached values +0.033s ... 0.753s

#32 No cached benchmark found, getting uncached values +0.027s ... 0.78s

#33 min, max, avg, median took s +0.022s ... 0.803s

#34 return log +0.317s ... 1.12s

No reviews found for this CPU (yet).

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Benchmarklist of all known CPUs that are used in laptops (desktop and laptop CPUs)

Other CPUs of the series Arrow Lake

» Intel Core Ultra 7 270K Plus
   24x
» Intel Core Ultra 9 285K
   24x 3.2 GHz - 5.7 GHz
» Intel Core Ultra 7 265KF
   20x 3.3 GHz - 5.5 GHz
» Intel Core Ultra 7 265K
   20x 3.3 GHz - 5.5 GHz
» Intel Core Ultra 9 290HX Plus
   24x 1.8 GHz - 5.5 GHz
» Intel Core Ultra 9 285
   24x 1.9 GHz - 5.6 GHz
» Intel Core Ultra 9 285HX
   24x 2.1 GHz - 5.5 GHz
» Intel Core Ultra 9 275HX
   24x 2.1 GHz - 5.4 GHz
» Intel Core Ultra 5 250K Plus
   18x 4.2 GHz - 5.3 GHz
» Intel Core Ultra 7 270HX Plus
   20x 1.8 GHz - 5.3 GHz
» Intel Core Ultra 7 265HX
   20x 2.3 GHz - 5.3 GHz
» Intel Core Ultra 7 255HX
   20x 2.3 GHz - 5.2 GHz
» Intel Core Ultra 5 245KF
   14x 3.6 GHz - 5.2 GHz
» Intel Core Ultra 5 245K
   14x 4.2 GHz - 5.2 GHz
» Intel Core Ultra 5 245
   14x 3 GHz - 5.1 GHz
» Intel Core Ultra 5 235
   14x 3.4 GHz - 5 GHz
» Intel Core Ultra 9 285H
   16x 4.5 GHz - 5.4 GHz
» Intel Core Ultra 7 251HX
   18x 2.5 GHz - 5.1 GHz
» Intel Core Ultra 7 265H
   16x 4.5 GHz - 5.3 GHz
» Intel Core Ultra 7 255H
   16x 4.4 GHz - 5.1 GHz
» Intel Core Ultra 5 235HX
   14x 2.6 GHz - 5.1 GHz
» Intel Core Ultra 5 225F
   10x 3.3 GHz - 4.9 GHz
» Intel Core Ultra 5 245HX
   14x 2.6 GHz - 5.1 GHz
» Intel Core 7 245HX
   14x 2.6 GHz - 5.1 GHz
» Intel Core Ultra 5 225H
   14x 4.3 GHz - 4.9 GHz
» Intel Core Ultra 5 225
   10x 3.3 GHz - 4.9 GHz
» Intel Core Ultra 5 235H
   14x 4.4 GHz - 5.1 GHz
» Intel Core Ultra 7 265U
   12x 2.4 GHz - 5.3 GHz
» Intel Core Ultra 7 255U
   12x 3.8 GHz - 4.8 GHz
» Intel Core Ultra 5 225U
   12x 2.4 GHz - 4.8 GHz
» Intel Core Ultra 5 235U
   12x 2.4 GHz - 4.9 GHz

Surrounding CPUs

+ AMD Ryzen AI 9 HX PRO 470
   12x 2 GHz - 5.2 GHz
+ AMD Ryzen AI 9 HX 375
   12x 2 GHz - 5.1 GHz
+ AMD Ryzen AI 9 HX PRO 375
   12x 2 GHz - 5.1 GHz
+ AMD Ryzen AI 9 HX 370
   12x 2 GHz - 5.1 GHz
+ AMD Ryzen AI 9 HX PRO 370
   12x 2 GHz - 5.1 GHz
» Intel Core Ultra 7 251HX
   18x 2.5 GHz - 5.1 GHz
- Intel Core i7-12800HX
   16x 1.5 GHz - 4.8 GHz
- Intel Core i9-12900HX
   16x 1.7 GHz - 5 GHz
- AMD Ryzen AI Max+ 392
   12x 3.2 GHz - 5 GHz
- AMD Ryzen 7 7745HX
   8x 3.6 GHz - 5.1 GHz
- Intel Core Ultra 7 356H
   16x 1.5 GHz - 4.7 GHz
Klaus Hinum (Update: 2026-04-14)