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Differences What are the advantages of each

Front view of Intel Pentium III 550E

Reasons to consider the
Intel Pentium III 550E

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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 N450

Reasons to consider the
Intel Atom N450

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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 0.55 GHz More than 3x 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 built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
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 Jan, 2010 vs Oct, 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
Lower typical power consumption 4.47W vs 11.78W 2.6x lower typical power consumption
Lower annual home energy cost 1.32 $/year vs 3.49 $/year 2.6x lower annual home energy cost
Lower annual commercial energy cost 4.82 $/year vs 12.7 $/year 2.6x lower annual commercial energy cost

Features Key features of the Pentium III 550E  vs Atom N450 

clock speed

Pentium III 550E
0.55 GHz
Atom N450
1.66 GHz

L2 cache

Atom N450
0.5 MB


Specifications Full list of technical specs


Pentium III 550E  vs
Atom N450 
Clock speed 0.55 GHz 1.66 GHz
Cores Single core Single core


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


Architecture FSB DMI
Number of links 1 1


Pentium III 550E  vs
Atom N450 
Architecture x86 x86-64
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
Clock multiplier 5 10

integrated graphics

Label N/A Integrated

power consumption

TDP 14.5W 5.5W
Annual home energy cost 3.49 $/year 1.32 $/year
Annual commercial energy cost 12.7 $/year 4.82 $/year
Typical power consumption 11.78W 4.47W
Intel Pentium III 550E
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Intel Atom N450
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