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Differences What are the advantages of each

Front view of Intel Atom Z615

Reasons to consider the
Intel Atom Z615

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Much lower typical power consumption 1.79W vs 116.42W 65.1x lower typical power consumption
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower annual home energy cost 0.53 $/year vs 42.79 $/year 80.7x lower annual home energy cost
Much lower annual commercial energy cost 1.93 $/year vs 113.7 $/year 59x lower annual commercial energy cost
Newer May, 2010 vs Jan, 2010 Release date 3 months later
Front view of AMD Athlon II X2 255

Reasons to consider the
AMD Athlon II X2 255

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Much higher clock speed 3.1 GHz vs 1.6 GHz Around 95% 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
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much better overclocked clock speed (Air) 3.8 GHz vs 1.2 GHz Around 3.2x better overclocked clock speed (Air)
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Water) 3.93 GHz vs 1.2 GHz More than 3.2x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once

Features Key features of the Atom Z615  vs Athlon II X2 255 

clock speed

Atom Z615
1.6 GHz

L2 cache

overclocked clock speed (air)

Atom Z615
1.2 GHz

overclocked clock speed (water)

Atom Z615
1.2 GHz
Athlon II X2 255
3.93 GHz

Specifications Full list of technical specs

summary

Atom Z615  vs
Athlon II X2 255 
Clock speed 1.6 GHz 3.1 GHz
Cores Single core Dual 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 2.2W 65W
Annual home energy cost 0.53 $/year 42.79 $/year
Annual commercial energy cost 1.93 $/year 113.7 $/year
Typical power consumption 1.79W 116.42W

details

Atom Z615  vs
Athlon II X2 255 
Architecture x86 x86-64
Threads 2 2
L2 cache 0.5 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 1.2 GHz 3.8 GHz
Overclocked clock speed (Water) 1.2 GHz 3.93 GHz
Overclocked clock speed (Air) 1.2 GHz 3.8 GHz

integrated graphics

GPU GPU None
Label Integrated N/A
GPU clock speed 400 MHz N/A

bus

Clock speed 400 MHz 2,000 MHz
Intel Atom Z615
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AMD Athlon II X2 255
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