Intel Core i7 6700K vs Intel Core Ultra 7 251HX
CPU · Specs Compare
General Parameters
Release Date
Aug 2015
Apr 2026
Manufacturer
Intel
Intel
Type
Desktop
Laptop
Instruction Set
x86-64
x86-64
Core Architecture
Skylake
Arrow Lake
Processor Number
i7-6700K
251HX
Integrated Graphics
HD Graphics 530
Arc Graphics (4-Cores)
Package
Transistor Count
1.75 billions
—
Manufacturing Process
14 nm
3 nm
Socket
LGA-1151
FCBGA-2114
Power Consumption
91 W
45-55 W
Max Turbo Power Consumption
—
160 W
Peak Operating Temperature
—
105 °C
CPU Performance
Performance Cores
4
6
Performance Core Threads
8
6
Performance Core Base Frequency
4.0 GHz
2.9 GHz
Performance Core Turbo Frequency
4.2 GHz
5.1 GHz
Total Core Count
4
18
Total Thread Count
8
18
Bus Frequency
100 MHz
100 MHz
Multiplier
40
29
L1 Cache
64 K per core
192 K per core
L2 Cache
256 K per core
2 MB per core
L3 Cache
8 MB shared
30 MB shared
Unlocked Multiplier
Yes
Yes
Efficiency Cores
—
12
Efficiency Core Threads
—
12
Efficiency Core Base Frequency
—
2.5 GHz
Efficiency Core Turbo Frequency
—
4.5 GHz
Memory Parameters
Memory Types
DDR4-2133,DDR3L-1600
DDR5-6400
Max Memory Size
64 GB
256 GB
Max Memory Channels
2
2
Max Memory Bandwidth
34.1 GB/s
102.4 GB/s
ECC Memory Support
No
No
Graphics Card Parameters
Integrated Graphics
true
true
GPU Max Dynamic Frequency
1150 MHz
1800 MHz
GPU Base Frequency
—
300 MHz
Shader Units
—
512
Texture Units
—
32
Raster Operation Units
—
16
Execution Units
—
64
Power Consumption
—
14
Miscellaneous
PCIe Version
3.0
5.0
PCIe Lanes
16
24
Extended Instruction Set
SSE4.1, SSE4.2, AVX-2
—
Benchmark
Cinebench R23
1,129
—
Cinebench R23
5,646
—
Geekbench 6
1,512
2,940
Geekbench 5
1,087
—
Geekbench 6
5,068
15,262
Geekbench 5
4,271
—
Blender
107
—
Passmark CPU
2,503
—
Passmark CPU
8,928
—
Cinebench 2024
—
130
Cinebench 2024
—
1,761
▲ Specs Compare
Data sourced from official specifications and benchmark tests.