Intel Core i7-6700K vs Intel Core i7-6660U

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CPU comparison with benchmarks

-VS-

CPU lineage

Intel Core i7-6700K or Intel Core i7-6700K – which processor offers superior performance? In this comparison, we examine disparities and assess which of these two CPUs outperforms the other. We delve into technical specifications and benchmark outcomes.
The Intel Core i7-6700K features 4 processor cores and has the capability to manage 8 threads concurrently.
It was released in Q3/2015 and belongs to the 6 generation of the Intel Core i7 series.
To use the Intel Core i7-6700K, you'll need a motherboard with a LGA 1151 socket.
The Intel Core i7-6660U features 2 processor cores and has the capability to manage 4 threads concurrently.
It was released in Q1/2016 and belongs to the 6 generation of the Intel Core i7 series.
To use the Intel Core i7-6660U, you'll need a motherboard with a BGA 1356 socket.
Desktop / Server Segment Mobile
Intel Core i7-6700K Name Intel Core i7-6660U
Intel Core i7 Family Intel Core i7
6 Generation 6
Intel Core i 6000 Group Intel Core i 6000U
 
 

CPU Cores and Base Frequency

The Intel Core i7-6700K has 4 CPU cores and can calculate 8 threads in parallel.
The clock frequency of the Intel Core i7-6700K is 4.0 GHz
and turbo frequency for one core is 4.2 GHz.
The Intel Core i7-6660U has 2 CPU cores and can calculate 4 threads in parallel.
The clock frequency of the Intel Core i7-6660U is 2.4 GHz
and turbo frequency for one core is 3.4 GHz.
4.2 GHz Turbo Frequency (1 core) 3.4 GHz
Yes Overclocking No
normal Core architecture normal
4.0 GHz Frequency 2.4 GHz
8 Threads 4
4.0 GHz Turbo Frequency (all cores) None
Yes Hyperthreading Yes
4 CPU Cores 2
4x Cores 2x
 
 

Internal Graphics

The Intel Core i7-6700K has integrated graphics, called iGPU for short.
Specifically, the Intel Core i7-6700K uses the Intel HD Graphics 530, which has 192 texture shaders
and 24 execution units.
The iGPU uses the system's main memory as graphics memory and sits on the processor's die.
The Intel Core i7-6660U has integrated graphics, called iGPU for short.
Specifically, the Intel Core i7-6660U uses the Intel Iris Graphics 540, which has 384 texture shaders
and 48 execution units.
0.35 GHz GPU frequency 0.3 GHz
Q3/2015 Release date Q3/2015
12 Direct X 12
Intel HD Graphics 530 GPU name Intel Iris Graphics 540
14 nm Technology 14 nm
-- Max. displays --
192 Shaders 384
32.0 GB Max. GPU Memory 32.0 GB
24 Execution units 48
9 Generation 9
1.15 GHz GPU (Turbo) 1.05 GHz
 
 

Artificial Intelligence and Machine Learning

-- AI specifications --
-- AI hardware --
 
 

Hardware codec support

A photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos.
Decode / Encode AVC Decode / Encode
Decode VC-1 Decode
Decode VP9 No
Decode h265 / HEVC (10 bit) No
Decode / Encode h264 Decode / Encode
Decode / Encode VP8 Decode / Encode
Decode / Encode h265 / HEVC (8 bit) Decode / Encode
Decode / Encode JPEG Decode / Encode
No AV1 No
 
 

Memory & PCIe

The processor supports a maximum memory capacity of 64.0 GB distributed across 2 memory channels. It offers a peak memory bandwidth of 34.1 GB/s. Both the type and quantity of memory can have a substantial impact on the overall system performance.
The processor supports a maximum memory capacity of 32.0 GB distributed across 2 memory channels. It offers a peak memory bandwidth of 34.1 GB/s. Both the type and quantity of memory can have a substantial impact on the overall system performance.
2 Memory channels 2
64.0 GB Max. Memory 32.0 GB
pci PCIe pci
Yes AES-NI Yes
No ECC No
34.1 GB/s Bandwidth 34.1 GB/s
DDR4-2133, DDR3-1866 Memory type DDR4-2133, LPDDR3-1866
 
 

Thermal Management

The processor has a thermal design power (TDP) of 91 W watts.
TDP indicates the cooling solution needed to effectively manage the processor's heat. It generally provides an approximate indication of the actual power consumption of the CPU itself.
The processor has a thermal design power (TDP) of 15 W watts.
-- Tjunction max 100 °C
91 W TDP (PL1 / PBP) 15 W
None TDP down 9.5 W
 
 

Technical details

The Intel Core i7-6700K is manufactured using a 14 nm process.
A smaller manufacturing process indicates a more contemporary and energy-efficient CPU.
In total, this processor boasts a generous 8.0 MB cache.
A substantial cache can significantly enhance the processor's performance, particularly in scenarios like gaming.
The Intel Core i7-6660U is manufactured using a 14 nm process.
In total, this processor boasts a generous 4.0 MB cache.
Q3/2015 Release date Q1/2016
-- Part Number --
0 bytes L2-Cache 0 bytes
VT-x, VT-x EPT, VT-d Virtualization VT-x, VT-x EPT, VT-d
SSE4.1, SSE4.2, AVX2 ISA extensions SSE4.1, SSE4.2, AVX2
Monolithic Chip design Monolithic
Skylake S Architecture Skylake U
14 nm Technology 14 nm
LGA 1151 Socket BGA 1356
Windows 10, Linux Operating systems Windows 10, Linux
420 $ Release price 415 $
Technical data sheet Documents Technical data sheet
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
8.0 MB L3-Cache 4.0 MB
 
 

Benchmarks

Geekbench 6 (Multi-Core)

Intel Core i7-6700K
4C 8T @ 4.0 GHz
4665
4665
Intel Core i7-6660U
2C 4T @ 2.4 GHz
2197
2197

Geekbench 5, 64bit (Multi-Core)

Intel Core i7-6700K
4C 8T @ 4.0 GHz
4459
4459
Intel Core i7-6660U
2C 4T @ 2.4 GHz
1896
1896

Geekbench 6 (Single-Core)

Intel Core i7-6700K
4C 8T @ 4.0 GHz
1347
1347
Intel Core i7-6660U
2C 4T @ 2.4 GHz
1092
1092