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Differences What are the advantages of each

Front view of Intel Core2 Duo T7400

Reasons to consider the
Intel Core2 Duo T7400

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Much more l2 cache 4 MB vs 0.5 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly higher clock speed 2.16 GHz vs 1 GHz Around 2.2x higher clock speed
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Much more l2 cache per core 2 MB/core vs 0.5 MB/core 4x more l2 cache per core
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Significantly better overclocked clock speed (Air) 2.32 GHz vs 1 GHz More than 2.2x better overclocked clock speed (Air)
More cores 2 vs 1 Twice as many cores; run more applications at once
Much better overclocked clock speed (Water) 2.92 GHz vs 1 GHz Around 3x better overclocked clock speed (Water)
Front view of Intel Atom E645CT

Reasons to consider the
Intel Atom E645CT

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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
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Significantly lower typical power consumption 5.69W vs 27.63W 4.9x lower typical power consumption
Newer Nov, 2010 vs Aug, 2006 Release date over 4 years later
Significantly lower annual home energy cost 1.69 $/year vs 8.19 $/year 4.9x lower annual home energy cost
Significantly lower annual commercial energy cost 6.13 $/year vs 29.78 $/year 4.9x lower annual commercial energy cost

Features Key features of the Core2 Duo T7400  vs Atom E645CT 

clock speed

Core2 Duo T7400
2.16 GHz
Atom E645CT
1 GHz

L2 cache

overclocked clock speed (air)

Core2 Duo T7400
2.32 GHz
Atom E645CT
1 GHz

overclocked clock speed (water)

Core2 Duo T7400
2.92 GHz
Atom E645CT
1 GHz

Specifications Full list of technical specs

summary

Core2 Duo T7400  vs
Atom E645CT 
Clock speed 2.16 GHz 1 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

power consumption

TDP 34W 7W
Annual home energy cost 8.19 $/year 1.69 $/year
Annual commercial energy cost 29.78 $/year 6.13 $/year
Typical power consumption 27.63W 5.69W

details

Core2 Duo T7400  vs
Atom E645CT 
Architecture x86-64 x86
Threads 2 2
L2 cache 4 MB 0.5 MB
L2 cache per core 2 MB/core 0.5 MB/core
Manufacture process 65 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.32 GHz 1 GHz
Overclocked clock speed (Water) 2.92 GHz 1 GHz
Overclocked clock speed (Air) 2.32 GHz 1 GHz

integrated graphics

GPU None GPU
Label N/A Integrated
GPU clock speed N/A 320 MHz

bus

Architecture FSB FSB
Number of links 1 1
Intel Core2 Duo T7400
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Intel Atom E645CT
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