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Differences What are the advantages of each

Front view of Intel Core i7 4770

Reasons to consider the
Intel Core i7 4770

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Much higher clock speed 3.4 GHz vs 0.6 GHz Around 5.8x 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
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Air) 3.85 GHz vs 0.6 GHz Around 6.5x 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) 4.01 GHz vs 0.6 GHz Around 6.8x better overclocked clock speed (Water)
Newer Jun, 2013 vs Nov, 2010 Release date over 2 years later
Front view of Intel Atom E625CT

Reasons to consider the
Intel Atom E625CT

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Much lower typical power consumption 5.69W vs 68.25W 12x 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 20.24 $/year 12x lower annual home energy cost
Much lower annual commercial energy cost 6.13 $/year vs 73.58 $/year 12x lower annual commercial energy cost

Features Key features of the Core i7 4770  vs Atom E625CT 

clock speed

Core i7 4770
3.4 GHz
Atom E625CT
0.6 GHz

L2 cache

overclocked clock speed (air)

Core i7 4770
3.85 GHz
Atom E625CT
0.6 GHz

overclocked clock speed (water)

Core i7 4770
4.01 GHz
Atom E625CT
0.6 GHz

Specifications Full list of technical specs

summary

Core i7 4770  vs
Atom E625CT 
Clock speed 3.4 GHz 0.6 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

details

Core i7 4770  vs
Atom E625CT 
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

overclocking

Overclocked clock speed 3.85 GHz 0.6 GHz
Overclocked clock speed (Water) 4.01 GHz 0.6 GHz
Overclocked clock speed (Air) 3.85 GHz 0.6 GHz

power consumption

TDP 84W 7W
Annual home energy cost 20.24 $/year 1.69 $/year
Annual commercial energy cost 73.58 $/year 6.13 $/year
Typical power consumption 68.25W 5.69W
Intel Core i7 4770
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Intel Atom E625CT
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