Cores: 18L3 cache: 30MB (shared)TDP: 45-55 W (max. boost up to 160 W)Transistor size: 3 nm
Core Ultra 7 251HX - laptop processor produced by Intel for socket FCBGA-2114 that has 18 cores and 18 threads. The base clock frequency of the CPU is 2900 MHz, but due to Turbo Boost technology, it can perform up to 5100 MHz. The size of the L3 cache is 30 MB. Please note that this chip has integrated graphics Arc Graphics (4-Cores).
Single-Core Performance
83
Multi-Core Performance
68
NanoReview Final Score
75
Compare Intel Core Ultra 7 251HX with other CPUs
Test in Benchmarks
Performance test of Intel Core Ultra 7 251HX in benchmarks
Cinebench
Reputable cross-platform benchmark for high-performance processors
Cinebench 2024 (Single)
130
Cinebench 2024 (Multi)
1762
GeekBench v6
The new version of this benchmark emulates common operations often used in real-world apps
Geekbench 6 (Single-Core)
2940
Geekbench 6 (Multi-Core)
15277
PassMark
Synthetic test that focuses on raw computational performance for low-level functions
Passmark CPU (Single-Core)
4367
Passmark CPU (Multi-Core)
46729
Integer math
122 GOps/sec
Floating point math
152.1 GOps/sec
Find prime numbers
440M Primes/sec
Random string sorting
61.6M Strings/sec
Data encryption
39.2 GBytes/sec
Data compression
512.7 MBytes/sec
Physics
2500 Frames/sec
Extended instructions
39.9B Matrices/sec
Sources:
PassMark
[3]
–
10
samples
Performance Per Watt
Shows the score you get per each watt of PL1 TDP
Cinebench 2024 / Watt
32 PPW
Geekbench 6 Multi / Watt
277.8 PPW
Passmark CPU Mark / Watt
849.6 PPW
These are rough calculations, as most CPUs surpass PL1 TDP wattage even in multicore workloads.
Specifications
Core Ultra 7 251HX technical specifications
Vendor
Intel
Released
April 1, 2026
Type
Laptop
Instruction Set
x86-64
Codename
Arrow Lake
Model number
251HX
Integrated GPU
Arc Graphics (4-Cores)
Performance Cores
P-Cores
6
P-Threads
6
Base Frequency (P)
2.9 GHz
Turbo Boost Frequency (P)
5.1 GHz
Efficient Cores
E-Cores
12
E-Threads
12
Base Frequency (E)
2.5 GHz
Turbo Boost Frequency (E)
4.5 GHz
Total
Total Cores
18
Total Threads
18
Bus Frequency
100 MHz
Multiplier
29x
L1 Cache
192K (per core)
L2 Cache
2MB (per core)
L3 Cache
30MB (shared)
Unlocked Multiplier
Yes
Fabrication Process
3 nm
TDP (PL1)
45-55 W (configurable)
Max. Boost TDP (PL2)
160 W
Socket
FCBGA-2114
Peak Temperature
105°C
Integrated Graphics
Arc Graphics (4-Cores)
GPU Base Clock
300 MHz
GPU Boost Clock
1800 MHz
Shading Units
512
TMUs
32
ROPs
16
Execution Units
64
TGP
14 W
Memory Types
- DDR5-6400
Max. Memory Size
256 GB
Memory Channels
2
Max. Memory Bandwidth
102.4 GB/s
ECC Support
No
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