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Differences What are the advantages of each

Front view of Intel Core2 Duo T7100

Reasons to consider the
Intel Core2 Duo T7100

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Significantly higher clock speed 1.8 GHz vs 0.6 GHz More than 3x 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) 2.03 GHz vs 0.6 GHz Around 3.5x better overclocked clock speed (Air)
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Water) 3.4 GHz vs 0.6 GHz Around 5.8x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once
Front view of Intel Atom E625CT

Reasons to consider the
Intel Atom E625CT

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Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly lower typical power consumption 5.69W vs 28.44W 5x lower typical power consumption
Newer Nov, 2010 vs Apr, 2007 Release date over 3 years later
Significantly lower annual home energy cost 1.69 $/year vs 8.43 $/year 5x lower annual home energy cost
Significantly lower annual commercial energy cost 6.13 $/year vs 30.66 $/year 5x lower annual commercial energy cost

Features Key features of the Core2 Duo T7100  vs Atom E625CT 

clock speed

Core2 Duo T7100
1.8 GHz
Atom E625CT
0.6 GHz

L2 cache

overclocked clock speed (air)

Core2 Duo T7100
2.03 GHz
Atom E625CT
0.6 GHz

overclocked clock speed (water)

Core2 Duo T7100
3.4 GHz
Atom E625CT
0.6 GHz

Specifications Full list of technical specs

summary

Core2 Duo T7100  vs
Atom E625CT 
Clock speed 1.8 GHz 0.6 GHz
Cores Dual core Single core

features

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

details

Core2 Duo T7100  vs
Atom E625CT 
Threads 2 2
L2 cache 2 MB 0.5 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 65 nm 45 nm

overclocking

Overclocked clock speed 2.03 GHz 0.6 GHz
Overclocked clock speed (Water) 3.4 GHz 0.6 GHz
Overclocked clock speed (Air) 2.03 GHz 0.6 GHz

power consumption

TDP 35W 7W
Annual home energy cost 8.43 $/year 1.69 $/year
Annual commercial energy cost 30.66 $/year 6.13 $/year
Typical power consumption 28.44W 5.69W
Intel Core2 Duo T7100
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Intel Atom E625CT
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