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Differences What are the advantages of each

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 77.19W 13.6x lower typical power consumption
Much lower annual home energy cost 1.69 $/year vs 22.89 $/year 13.6x lower annual home energy cost
Much lower annual commercial energy cost 6.13 $/year vs 83.22 $/year 13.6x lower annual commercial energy cost
Newer Nov, 2010 vs May, 2010 Release date 6 months later
Front view of AMD Athlon II X4 640

Reasons to consider the
AMD Athlon II X4 640

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Much higher clock speed 3 GHz vs 0.6 GHz 5x higher clock speed
Much more l2 cache 2 MB vs 0.5 MB 4x 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) 3.57 GHz vs 0.6 GHz Around 6x better overclocked clock speed (Air)
More cores 4 vs 1 3 more cores; run more applications at once
Much better overclocked clock speed (Water) 3.89 GHz vs 0.6 GHz Around 6.5x better overclocked clock speed (Water)
More threads 4 vs 2 Twice as many threads

Features Key features of the Atom E625CT  vs Athlon II X4 640 

clock speed

L2 cache

overclocked clock speed (air)

Atom E625CT
0.6 GHz
Athlon II X4 640
3.57 GHz

overclocked clock speed (water)

Atom E625CT
0.6 GHz
Athlon II X4 640
3.89 GHz

Specifications Full list of technical specs

summary

Atom E625CT  vs
Athlon II X4 640 
Clock speed 0.6 GHz 3 GHz
Cores Single core Quad core

features

Has a NX bit No Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

details

Atom E625CT  vs
Athlon II X4 640 
Threads 2 4
L2 cache 0.5 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm

overclocking

Overclocked clock speed 0.6 GHz 3.57 GHz
Overclocked clock speed (Water) 0.6 GHz 3.89 GHz
Overclocked clock speed (Air) 0.6 GHz 3.57 GHz

power consumption

TDP 7W 95W
Annual home energy cost 1.69 $/year 22.89 $/year
Annual commercial energy cost 6.13 $/year 83.22 $/year
Typical power consumption 5.69W 77.19W
Intel Atom E625CT
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AMD Athlon II X4 640
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