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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
Significantly higher clock speed 4 GHz vs 3.2 GHz Around 25% higher clock speed
Higher turbo clock speed 4.2 GHz vs 3.8 GHz More than 10% higher turbo clock speed
Significantly better overclocked clock speed (Air) 4.61 GHz vs 3.8 GHz More than 20% better overclocked clock speed (Air)
More threads 8 vs 4 Twice as many threads
Significantly better overclocked clock speed (Water) 4.77 GHz vs 3.8 GHz More than 25% better overclocked clock speed (Water)
Front view of Intel 6685R

Reasons to consider the
Intel 6685R

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Significantly lower typical power consumption 52.81W vs 73.94W Around 30% lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Higher Maximum operating temperature 71 °C vs 64 °C More than 10% higher Maximum operating temperature
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
Newer Apr, 2016 vs Jul, 2015 Release date 9 months later

Features Key features of the Core i7 6700K  vs 6685R 

clock speed

6685R
3.2 GHz

turbo clock speed

Core i7 6700K
4.2 GHz
6685R
3.8 GHz

gpu clock speed

Core i7 6700K
350 MHz
6685R
350 MHz

overclocked clock speed (air)

Core i7 6700K
4.61 GHz
6685R
3.8 GHz

overclocked clock speed (water)

Core i7 6700K
4.77 GHz
6685R
3.8 GHz

TDP

Specifications Full list of technical specs

summary

Core i7 6700K  vs
6685R 
Clock speed 4 GHz 3.2 GHz
Turbo clock speed 4.2 GHz 3.8 GHz
Cores Quad core Quad core
Is unlocked Yes No

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
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
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
6685R 
Architecture x86-64 x86-64
Threads 8 4
Manufacture process 14 nm 14 nm
Max CPUs 1 1
Operating temperature Unknown - 64°C Unknown - 71°C

overclocking

Overclocked clock speed 4.61 GHz 3.8 GHz
Overclocked clock speed (Water) 4.77 GHz 3.8 GHz
Overclocked clock speed (Air) 4.61 GHz 3.8 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 530 Intel® Iris™ Pro Graphics 580
Number of displays supported 3 3
GPU clock speed 350 MHz 350 MHz
Turbo clock speed 1,150 MHz 1,150 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 6685R
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