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Differences What are the advantages of each

Front view of Intel Core2 Duo P8600

Reasons to consider the
Intel Core2 Duo P8600

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Much more l2 cache 3 MB vs 0.5 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 2.4 GHz vs 1 GHz Around 2.5x 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
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much more l2 cache per core 1.5 MB/core vs 0.5 MB/core 3x more l2 cache per core
Much better overclocked clock speed (Air) 2.77 GHz vs 1 GHz More than 2.8x 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) 2.4 GHz vs 1 GHz Around 2.5x better overclocked clock speed (Water)
Front view of Intel Atom E645CT

Reasons to consider the
Intel Atom E645CT

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Lower typical power consumption 5.69W vs 20.31W 3.6x lower typical power consumption
Newer Nov, 2010 vs Jul, 2008 Release date over 2 years later
Lower annual home energy cost 1.69 $/year vs 6.02 $/year 3.6x lower annual home energy cost
Lower annual commercial energy cost 6.13 $/year vs 21.9 $/year 3.6x lower annual commercial energy cost

Features Key features of the Core2 Duo P8600  vs Atom E645CT 

clock speed

L2 cache

overclocked clock speed (air)

Core2 Duo P8600
2.77 GHz
Atom E645CT
1 GHz

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Core2 Duo P8600  vs
Atom E645CT 
Clock speed 2.4 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
SSE4.1
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 25W 7W
Annual home energy cost 6.02 $/year 1.69 $/year
Annual commercial energy cost 21.9 $/year 6.13 $/year
Typical power consumption 20.31W 5.69W

details

Core2 Duo P8600  vs
Atom E645CT 
Architecture x86-64 x86
Threads 2 2
L2 cache 3 MB 0.5 MB
L2 cache per core 1.5 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.77 GHz 1 GHz
Overclocked clock speed (Water) 2.4 GHz 1 GHz
Overclocked clock speed (Air) 2.77 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 P8600
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Intel Atom E645CT
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