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Differences What are the advantages of each

Front view of Intel Atom N455

Reasons to consider the
Intel Atom N455

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 5.28W vs 60.94W 11.5x lower typical power consumption
Much lower annual commercial energy cost 5.69 $/year vs 65.7 $/year 11.5x lower annual commercial energy cost
Much lower annual home energy cost 1.57 $/year vs 18.07 $/year 11.5x lower annual home energy cost
Newer Jun, 2010 vs Feb, 2009 Release date over 1 years later
Front view of AMD Opteron 2389

Reasons to consider the
AMD Opteron 2389

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Much higher clock speed 2.9 GHz vs 1.66 GHz Around 75% 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 virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
More cores 4 vs 1 3 more cores; run more applications at once
Significantly better overclocked clock speed (Air) 2.9 GHz vs 1.88 GHz Around 55% better overclocked clock speed (Air)
More threads 4 vs 2 Twice as many threads
Significantly better overclocked clock speed (Water) 2.9 GHz vs 1.67 GHz Around 75% better overclocked clock speed (Water)

Features Key features of the Atom N455  vs Opteron 2389 

clock speed

Atom N455
1.66 GHz
Opteron 2389
2.9 GHz

L2 cache

Atom N455
0.5 MB

overclocked clock speed (air)

Atom N455
1.88 GHz
Opteron 2389
2.9 GHz

overclocked clock speed (water)

Atom N455
1.67 GHz
Opteron 2389
2.9 GHz

TDP

Specifications Full list of technical specs

summary

Atom N455  vs
Opteron 2389 
Clock speed 1.66 GHz 2.9 GHz
Cores Single core Quad core

features

Has a NX bit Yes Yes
Has virtualization support No Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 6.5W 75W
Annual home energy cost 1.57 $/year 18.07 $/year
Annual commercial energy cost 5.69 $/year 65.7 $/year
Typical power consumption 5.28W 60.94W

details

Atom N455  vs
Opteron 2389 
Threads 2 4
L2 cache 0.5 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 2
Clock multiplier 10 14

overclocking

Overclocked clock speed 1.88 GHz 2.9 GHz
Overclocked clock speed (Water) 1.67 GHz 2.9 GHz
Overclocked clock speed (Air) 1.88 GHz 2.9 GHz

integrated graphics

GPU GPU None
Label Integrated N/A
GPU clock speed 200 MHz N/A

bus

Architecture DMI HyperTransport 3.0
Intel Atom N455
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AMD Opteron 2389
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