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Differences What are the advantages of each

Front view of Intel Atom Z550

Reasons to consider the
Intel Atom Z550

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Much lower typical power consumption 1.95W vs 101.56W 52.1x lower typical power consumption
Much better performance per watt 6.48 pt/W vs 1.28 pt/W More than 5x better performance per watt
Much lower annual home energy cost 0.58 $/year vs 30.11 $/year 52.1x lower annual home energy cost
Much lower annual commercial energy cost 2.1 $/year vs 109.5 $/year 52.1x lower annual commercial energy cost
Front view of AMD Phenom II X4 955

Reasons to consider the
AMD Phenom II X4 955

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Significantly higher clock speed 3.2 GHz vs 2 GHz More than 60% 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
Much better geekbench 2 (32-bit) score 5,649 vs 934 More than 6x better geekbench 2 (32-bit) score
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Much better overclocked clock speed (Air) 3.99 GHz vs 2.16 GHz Around 85% better overclocked clock speed (Air)
More cores 4 vs 1 3 more cores; run more applications at once
Better PassMark score 3,960 vs 381 Around 10.5x better PassMark score
Much better overclocked clock speed (Water) 4.14 GHz vs 2 GHz More than 2x better overclocked clock speed (Water)
More threads 4 vs 2 Twice as many threads
Newer Nov, 2009 vs Apr, 2009 Release date 7 months later

Benchmarks Real world tests of Atom Z550 vs Phenom II X4 955

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Atom Z550  vs
Phenom II X4 955 
Clock speed 2 GHz 3.2 GHz
Cores Single core Quad core
Socket type
441
AM3

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 2.4W 125W
Annual home energy cost 0.58 $/year 30.11 $/year
Annual commercial energy cost 2.1 $/year 109.5 $/year
Performance per watt 6.48 pt/W 1.28 pt/W
Typical power consumption 1.95W 101.56W

details

Atom Z550  vs
Phenom II X4 955 
Architecture x86 x86-64
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 1

overclocking

Overclocked clock speed 2.16 GHz 3.99 GHz
Overclocked clock speed (Water) 2 GHz 4.14 GHz
Overclocked clock speed (Air) 2.16 GHz 3.99 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A

bus

Clock speed 533 MHz 2,000 MHz
Intel Atom Z550
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AMD Phenom II X4 955
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