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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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Much higher clock speed 4 GHz vs 1.33 GHz More than 3x higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Significantly newer manufacturing process 14 nm vs 22 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.61 GHz vs 1.33 GHz Around 3.5x better overclocked clock speed (Air)
More threads 8 vs 2 6 more threads
More cores 4 vs 2 Twice as many cores; run more applications at once
Much better overclocked clock speed (Water) 4.77 GHz vs 1.33 GHz More than 3.5x better overclocked clock speed (Water)
Newer Jul, 2015 vs Oct, 2014 Release date 9 months later
Front view of Intel Atom E3805

Reasons to consider the
Intel Atom E3805

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Much lower typical power consumption 2.44W vs 73.94W 30.3x lower typical power consumption
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Much lower annual home energy cost 0.72 $/year vs 21.92 $/year 30.3x lower annual home energy cost
Much lower annual commercial energy cost 2.63 $/year vs 79.72 $/year 30.3x lower annual commercial energy cost

Features Key features of the Core i7 6700K  vs Atom E3805 

clock speed

Atom E3805
1.33 GHz

L2 cache

overclocked clock speed (air)

Core i7 6700K
4.61 GHz
Atom E3805
1.33 GHz

overclocked clock speed (water)

Core i7 6700K
4.77 GHz
Atom E3805
1.33 GHz

Specifications Full list of technical specs

summary

Core i7 6700K  vs
Atom E3805 
Clock speed 4 GHz 1.33 GHz
Cores Quad core Dual core

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 3W
Annual home energy cost 21.92 $/year 0.72 $/year
Annual commercial energy cost 79.72 $/year 2.63 $/year
Typical power consumption 73.94W 2.44W

bus

Architecture FSB FSB
Number of links 0 1

details

Core i7 6700K  vs
Atom E3805 
Architecture x86-64 x86-64
Threads 8 2
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 14 nm 22 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.61 GHz 1.33 GHz
Overclocked clock speed (Water) 4.77 GHz 1.33 GHz
Overclocked clock speed (Air) 4.61 GHz 1.33 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics 530 N/A
Number of displays supported 3 N/A
GPU clock speed 350 MHz N/A
Turbo clock speed 1,150 MHz N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3
Channels Dual Channel Single Channel
Supports ECC No Yes
Maximum bandwidth 25,600 MB/s 6,400 MB/s
Maximum memory size 65,536 MB 8,192 MB
Intel Core i7 6700K
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Intel Atom E3805
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