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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 GHz 4x 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 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
Much better overclocked clock speed (Air) 4.63 GHz vs 1 GHz Around 4.8x 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
Newer Apr, 2014 vs May, 2010 Release date over 3 years later
Much better overclocked clock speed (Water) 4.8 GHz vs 1 GHz More than 4.8x better overclocked clock speed (Water)
Front view of Intel Atom Z605

Reasons to consider the
Intel Atom Z605

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Much lower typical power consumption 1.63W vs 71.5W 44x 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 0.48 $/year vs 21.2 $/year 44x lower annual home energy cost
Much lower annual commercial energy cost 1.75 $/year vs 77.09 $/year 44x lower annual commercial energy cost

Features Key features of the Core i7 4790K  vs Atom Z605 

clock speed

Atom Z605
1 GHz

L2 cache

Atom Z605
0.5 MB

overclocked clock speed (air)

Core i7 4790K
4.63 GHz
Atom Z605
1 GHz

overclocked clock speed (water)

Core i7 4790K
4.8 GHz
Atom Z605
1 GHz

Specifications Full list of technical specs

summary

Core i7 4790K  vs
Atom Z605 
Clock speed 4 GHz 1 GHz
Cores Quad core Single core

features

Has a NX bit 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

details

Core i7 4790K  vs
Atom Z605 
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 GHz
Overclocked clock speed (Water) 4.8 GHz 1 GHz
Overclocked clock speed (Air) 4.63 GHz 1 GHz

power consumption

TDP 88W 2W
Annual home energy cost 21.2 $/year 0.48 $/year
Annual commercial energy cost 77.09 $/year 1.75 $/year
Typical power consumption 71.5W 1.63W
Intel Core i7 4790K
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Intel Atom Z605
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