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Differences What are the advantages of each

Front view of Intel Pentium III 800EB

Reasons to consider the
Intel Pentium III 800EB

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Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Front view of Intel Atom N455

Reasons to consider the
Intel Atom N455

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Much newer manufacturing process 45 nm vs 180 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly higher clock speed 1.66 GHz vs 0.8 GHz More than 2x higher clock speed
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
More l2 cache 0.5 MB vs 0.25 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Newer Jun, 2010 vs Dec, 1999 Release date over 10 years later
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Features Key features of the Pentium III 800EB  vs Atom N455 

clock speed

Atom N455
1.66 GHz

L2 cache

Atom N455
0.5 MB

Specifications Full list of technical specs

summary

Pentium III 800EB  vs
Atom N455 
Clock speed 0.8 GHz 1.66 GHz
Cores Single core Single core

features

Has a NX bit No Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
Supplemental SSE3

details

Pentium III 800EB  vs
Atom N455 
Threads 1 2
L2 cache 0.25 MB 0.5 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 180 nm 45 nm
Max CPUs 2 1

power consumption

Typical power consumption N/A 5.28W
Intel Pentium III 800EB
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Intel Atom N455
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