Intel Core i7-5820K vs Intel Core i7-6700K

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CPU comparison with benchmarks


Intel Core i7-5820K CPU1 vs CPU2 Intel Core i7-6700K
Intel Core i7-5820K Intel Core i7-6700K

CPU comparison

Intel Core i7-5820K or Intel Core i7-6700K - which processor is faster? In this comparison we look at the differences and analyze which of these two CPUs is better. We compare the technical data and benchmark results.

The Intel Core i7-5820K has 6 cores with 12 threads and clocks with a maximum frequency of 3.60 GHz. Up to 64 GB of memory is supported in 4 memory channels. The Intel Core i7-5820K was released in Q3/2014.

The Intel Core i7-6700K has 4 cores with 8 threads and clocks with a maximum frequency of 4.20 GHz. The CPU supports up to 64 GB of memory in 2 memory channels. The Intel Core i7-6700K was released in Q3/2015.
Intel Core i7 Extreme Edition (24) Family Intel Core i7 (298)
Intel Core i 5000X (3) CPU group Intel Core i 6000 (24)
5 Generation 6
Haswell E Architecture Skylake S
Desktop / Server Segment Desktop / Server
Intel Core i7-4820K Predecessor Intel Core i7-4770K
-- Successor Intel Core i7-7700K

CPU Cores and Base Frequency

The Intel Core i7-5820K has 6 CPU cores and can calculate 12 threads in parallel. The clock frequency of the Intel Core i7-5820K is 3.30 GHz (3.60 GHz) while the Intel Core i7-6700K has 4 CPU cores and 8 threads can calculate simultaneously. The clock frequency of the Intel Core i7-6700K is at 4.00 GHz (4.20 GHz).

Intel Core i7-5820K Characteristic Intel Core i7-6700K
6 Cores 4
12 Threads 8
normal Core architecture normal
Yes Hyperthreading Yes
Yes Overclocking ? Yes
3.30 GHz Frequency 4.00 GHz
3.60 GHz Turbo Frequency (1 Core) 4.20 GHz
3.40 GHz Turbo Frequency (All Cores) 4.00 GHz

NPU AI performance

The performance values of the processor's AI unit. The isolated NPU performance is specified here, the total AI performance (NPU+CPU+iGPU) can be higher. Processors with support for artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors.

Intel Core i7-5820K Characteristic Intel Core i7-6700K
-- AI hardware --
-- AI specifications --
-- NPU + CPU + iGPU --

Integrated graphics (iGPU)

The Intel Core i7-5820K or Intel Core i7-6700K has integrated graphics, called iGPU for short. The iGPU uses the system's main memory as graphics memory and sits on the processor's die.

no iGPU GPU Intel HD Graphics 530
GPU frequency 0.35 GHz
-- GPU (Turbo) 1.15 GHz
-- GPU Generation 9
Technology 14 nm
Max. displays 3
-- Compute units 24
-- Shader 192
No Hardware Raytracing No
No Frame Generation No
-- Max. GPU Memory 32 GB
-- DirectX Version 12

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.

no iGPU GPU Intel HD Graphics 530
No Codec h265 / HEVC (8 bit) Decode / Encode
No Codec h265 / HEVC (10 bit) Decode
No Codec h264 Decode / Encode
No Codec VP9 Decode
No Codec VP8 Decode / Encode
No Codec AV1 No
No Codec AVC Decode / Encode
No Codec VC-1 Decode
No Codec JPEG Decode / Encode

Memory & PCIe

The Intel Core i7-5820K can use up to 64 GB of memory in 4 memory channels. The maximum memory bandwidth is 68.2 GB/s. The Intel Core i7-6700K supports up to 64 GB of memory in 2 memory channels and achieves a memory bandwidth of up to 34.1 GB/s.

Intel Core i7-5820K Characteristic Intel Core i7-6700K
DDR4-2133 Memory DDR4-2133, DDR3-1866
64 GB Max. Memory 64 GB
4 (Quad Channel) Memory channels 2 (Dual Channel)
68.2 GB/s Max. Bandwidth 34.1 GB/s
No ECC No
-- L2 Cache --
15.00 MB L3 Cache 8.00 MB
3.0 PCIe version 3.0
28 PCIe lanes 16
27.6 GB/s PCIe Bandwidth 15.8 GB/s

Thermal Management

The thermal design power (TDP for short) of the Intel Core i7-5820K is 140 W, while the Intel Core i7-6700K has a TDP of 91 W. The TDP specifies the necessary cooling solution that is required to cool the processor sufficiently.

Intel Core i7-5820K Characteristic Intel Core i7-6700K
140 W TDP (PL1 / PBP) 91 W
-- TDP (PL2) --
-- TDP up --
-- TDP down --
-- Tjunction max. --

Technical details

The Intel Core i7-5820K is manufactured in 22 nm and has 15.00 MB cache. The Intel Core i7-6700K is manufactured in 14 nm and has a 8.00 MB cache.

Intel Core i7-5820K Characteristic Intel Core i7-6700K
22 nm Technology 14 nm
Monolithic Chip design Monolithic
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
SSE4.1, SSE4.2, AVX2 ISA extensions SSE4.1, SSE4.2, AVX2
LGA 2011-3 Socket LGA 1151
VT-x, VT-x EPT, VT-d Virtualization VT-x, VT-x EPT, VT-d
Yes AES-NI Yes
Windows 10, Linux Operating systems Windows 10, Linux
Q3/2014 Release date Q3/2015
499 $ Release price 420 $
show more data show more data


Rate these processors

Here you can rate the Intel Core i7-5820K to help other visitors make their purchasing decisions. The average rating is 5.0 stars (3 ratings). Rate now:
Here you can rate the Intel Core i7-6700K to help other visitors make their purchasing decisions. The average rating is 4.1 stars (26 ratings). Rate now:


Average performance in benchmarks

⌀ Single core performance in 5 CPU benchmarks
Intel Core i7-5820K (77%)
Intel Core i7-6700K (100%)
⌀ Multi core performance in 9 CPU benchmarks
Intel Core i7-5820K (99%)
Intel Core i7-6700K (89%)

Cinebench R23 (Single-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.60 GHz
795 (71%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.20 GHz
1124 (100%)

Cinebench R23 (Multi-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
5700 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
5640 (99%)

Geekbench 5, 64bit (Single-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.60 GHz
923 (80%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.20 GHz
1151 (100%)

Geekbench 5, 64bit (Multi-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
5537 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
4459 (81%)

Geekbench 6 (Single-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The single-core benchmark only evaluates the performance of the fastest CPU core, the number of CPU cores in a processor is irrelevant here.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.60 GHz
1086 (81%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.20 GHz
1347 (100%)

Geekbench 6 (Multi-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The multi-core benchmark evaluates the performance of all of the processor's CPU cores. Virtual thread improvements such as AMD SMT or Intel's Hyper-Threading have a positive impact on the benchmark result.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
5763 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
4665 (81%)

Cinebench R20 (Single-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.60 GHz
329 (78%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.20 GHz
421 (100%)

Cinebench R20 (Multi-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
2301 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
2059 (89%)

Blender 3.1 Benchmark

In the Blender Benchmark 3.1, the scenes "monster", "junkshop" and "classroom" are rendered and the time required by the system is measured. In our benchmark we test the CPU and not the graphics card. Blender 3.1 was presented as a standalone version in March 2022.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
88 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
82 (93%)

Estimated results for PassMark CPU Mark

Some of the CPUs listed below have been benchmarked by CPU-monkey. However the majority of CPUs have not been tested and the results have been estimated by a CPU-monkey’s secret proprietary formula. As such they do not accurately reflect the actual Passmark CPU mark values and are not endorsed by PassMark Software Pty Ltd.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
9854 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
8955 (91%)

Blender 2.81 (bmw27)

Blender is a free 3D graphics software for rendering (creating) 3D bodies, which can also be textured and animated in the software. The Blender benchmark creates predefined scenes and measures the time (s) required for the entire scene. The shorter the time required, the better. We selected bmw27 as the benchmark scene.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
331.7 (90%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
369.3 (100%)

CPU-Z Benchmark 17 (Multi-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.30 GHz
2849 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
2313 (81%)

Cinebench R15 (Single-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.60 GHz
139 (77%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.20 GHz
180 (100%)

Cinebench R15 (Multi-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.40 GHz
1085 (100%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.00 GHz
888 (82%)

iGPU - FP32 Performance (Single-precision GFLOPS)

The theoretical computing performance of the internal graphics unit of the processor with simple accuracy (32 bit) in GFLOPS. GFLOPS indicates how many billion floating point operations the iGPU can perform per second.
Intel Core i7-5820K Intel Core i7-5820K
@ 0.00 GHz
0 (0%)
Intel Core i7-6700K Intel Core i7-6700K
Intel HD Graphics 530 @ 1.15 GHz
442 (100%)

CPU-Z Benchmark 17 (Single-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.
Intel Core i7-5820K Intel Core i7-5820K
6C 12T @ 3.60 GHz
0 (0%)
Intel Core i7-6700K Intel Core i7-6700K
4C 8T @ 4.20 GHz
464 (100%)

Devices using this processor

Intel Core i7-5820K Intel Core i7-6700K
Unknown Unknown

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