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Differences What are the advantages of each

Front view of Intel Core i7 4790K

Reasons to consider the
Intel Core i7 4790K

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Much higher clock speed 4 GHz vs 1.3 GHz More than 3x higher clock speed
Much newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
More l2 cache 1 MB vs 0.5 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Air) 4.63 GHz vs 1.3 GHz More than 3.5x better overclocked clock speed (Air)
More cores 4 vs 1 3 more cores; run more applications at once
More threads 8 vs 2 6 more threads
Much better overclocked clock speed (Water) 4.8 GHz vs 1.3 GHz Around 3.8x better overclocked clock speed (Water)
Newer Apr, 2014 vs Nov, 2010 Release date over 3 years later
Front view of Intel Atom E665C

Reasons to consider the
Intel Atom E665C

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Much lower typical power consumption 5.69W vs 71.5W 12.6x 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 1.69 $/year vs 21.2 $/year 12.6x lower annual home energy cost
Much lower annual commercial energy cost 6.13 $/year vs 77.09 $/year 12.6x lower annual commercial energy cost
Higher GPU clock speed 400 MHz vs 350 MHz Around 15% higher GPU clock speed

Features Key features of the Core i7 4790K  vs Atom E665C 

clock speed

Atom E665C
1.3 GHz

L2 cache

gpu clock speed

Core i7 4790K
350 MHz
Atom E665C
400 MHz

overclocked clock speed (air)

Core i7 4790K
4.63 GHz
Atom E665C
1.3 GHz

overclocked clock speed (water)

Core i7 4790K
4.8 GHz
Atom E665C
1.3 GHz

Specifications Full list of technical specs

summary

Core i7 4790K  vs
Atom E665C 
Clock speed 4 GHz 1.3 GHz
Cores Quad core Single core

features

Has a NX bit Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
F16C
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
FMA3
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 88W 7W
Annual home energy cost 21.2 $/year 1.69 $/year
Annual commercial energy cost 77.09 $/year 6.13 $/year
Typical power consumption 71.5W 5.69W

bus

Architecture DMI 2.0 FSB
Number of links 0 1
Transfer rate 5,000 MT/s 2,500 MT/s

details

Core i7 4790K  vs
Atom E665C 
Architecture x86-64 x86
Threads 8 2
L2 cache 1 MB 0.5 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 22 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.63 GHz 1.3 GHz
Overclocked clock speed (Water) 4.8 GHz 1.3 GHz
Overclocked clock speed (Air) 4.63 GHz 1.3 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 4600 Integrated
GPU clock speed 350 MHz 400 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3L-1600
DDR3-1333
DDR2-800
DDR2
Channels Dual Channel Single Channel
Supports ECC No No
Maximum bandwidth 25,600 MB/s 6,400 MB/s
Maximum memory size 32,768 MB 3,000.32 MB
Intel Core i7 4790K
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Intel Atom E665C
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