CPUBoss Review Our evaluation of 6700K vs 6400 among all CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

No winner declared

Too close to call

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VS

Intel Core i7 6700K

CPUBoss Winner
Front view of Intel Core i7 6700K

Differences What are the advantages of each

Front view of Intel Core i7 6700K

Reasons to consider the
Intel Core i7 6700K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much higher clock speed 4 GHz vs 2.7 GHz Around 50% higher clock speed
Significantly higher turbo clock speed 4.2 GHz vs 3.3 GHz More than 25% higher turbo clock speed
Significantly better turbo clock speed 1,150 MHz vs 950 MHz More than 20% better turbo clock speed
Significantly better PassMark score 11,109 vs 6,727 More than 65% better PassMark score
Slightly more l3 cache 8 MB vs 6 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
Better PassMark (Single core) score 2,349 vs 1,832 Around 30% better PassMark (Single core) score
Significantly better overclocked clock speed (Air) 4.62 GHz vs 3.65 GHz More than 25% better overclocked clock speed (Air)
More threads 8 vs 4 Twice as many threads
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Better CompuBench 1.5 video composition score 14.01 fps vs 10.6 fps More than 30% better CompuBench 1.5 video composition score
Slightly better performance per watt 3.47 pt/W vs 2.76 pt/W More than 25% better performance per watt
Better overclocked clock speed (Water) 4.77 GHz vs 4.38 GHz Around 10% better overclocked clock speed (Water)
Front view of Intel Core i5 6400

Reasons to consider the
Intel Core i5 6400

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Significantly lower typical power consumption 52.81W vs 73.94W Around 30% lower typical power consumption
Higher Maximum operating temperature 71 °C vs 64 °C More than 10% higher Maximum operating temperature
Slightly better performance per dollar 0.96 pt/$ vs 0.9 pt/$ More than 5% better performance per dollar
Significantly lower annual home energy cost 15.66 $/year vs 21.92 $/year Around 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 79.72 $/year Around 30% lower annual commercial energy cost

Benchmarks Real world tests of Core i7 6700K vs i5 6400

CompuBench 1.5 (Bitcoin mining) Data courtesy CompuBench

Core i7 6700K
33.6 mHash/s
Core i5 6400
24.14 mHash/s

CompuBench 1.5 (Face detection)

Core i7 6700K
26.72 mPixels/s
Core i5 6400
19.56 mPixels/s

CompuBench 1.5 (T-Rex) Data courtesy CompuBench

Core i7 6700K
1.82 fps
Core i5 6400
1.31 fps

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 6700K
17,583
Core i5 6400
3,989.5

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i5 6400
2,428.5

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 6700K
6,010 MB/s
Core i5 6400
155.25 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 6700K  vs
i5 6400 
Clock speed 4 GHz 2.7 GHz
Turbo clock speed 4.2 GHz 3.3 GHz
Cores Quad core Quad core
Is unlocked Yes No

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 91W 65W
Annual home energy cost 21.92 $/year 15.66 $/year
Annual commercial energy cost 79.72 $/year 56.94 $/year
Performance per watt 3.47 pt/W 2.76 pt/W
Typical power consumption 73.94W 52.81W

bus

Architecture FSB FSB
Number of links 0 1
Transfer rate 8,000 MT/s 8,000 MT/s

details

Core i7 6700K  vs
i5 6400 
Architecture x86-64 x86-64
Threads 8 4
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 14 nm 14 nm
Max CPUs 1 1
Operating temperature Unknown - 64°C Unknown - 71°C

overclocking

Overclocked clock speed 4.62 GHz 3.65 GHz
Overclocked clock speed (Water) 4.77 GHz 4.38 GHz
Overclocked clock speed (Air) 4.62 GHz 3.65 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 530 Intel® HD Graphics 530
Number of displays supported 3 3
GPU clock speed 350 MHz 350 MHz
Turbo clock speed 1,150 MHz 950 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,600 MB/s 25,600 MB/s
Maximum memory size 65,536 MB 65,536 MB
Intel Core i7 6700K
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Intel Core i5 6400
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