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Differences What are the advantages of each

Front view of Intel Atom D2550

Reasons to consider the
Intel Atom D2550

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Much better geekbench 3 AES single core score 29,700 MB/s vs 93 MB/s More than 319.2x better geekbench 3 AES single core score
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly lower typical power consumption 8.13W vs 36.56W 4.5x lower typical power consumption
Much higher Maximum operating temperature 100 °C vs 71 °C More than 40% higher Maximum operating temperature
Better performance per watt 3.59 pt/W vs 1.59 pt/W More than 2.2x better performance per watt
Newer Mar, 2012 vs Oct, 2009 Release date over 2 years later
Significantly lower annual home energy cost 2.41 $/year vs 10.84 $/year 4.5x lower annual home energy cost
Significantly lower annual commercial energy cost 8.76 $/year vs 39.42 $/year 4.5x lower annual commercial energy cost
Front view of AMD Athlon II X3 405e

Reasons to consider the
AMD Athlon II X3 405e

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Significantly more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Higher clock speed 2.3 GHz vs 1.86 GHz Around 25% higher clock speed
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 virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much better overclocked clock speed (Air) 3.45 GHz vs 1.87 GHz Around 85% better overclocked clock speed (Air)
More l2 cache per core 0.67 MB/core vs 0.5 MB/core Around 35% more l2 cache per core
More cores 3 vs 2 1 more cores; run more applications at once
Better PassMark score 2,041 vs 671 More than 3x better PassMark score
Better overclocked clock speed (Water) 2.3 GHz vs 1.87 GHz Around 25% better overclocked clock speed (Water)

Benchmarks Real world tests of Atom D2550 vs Athlon II X3 405e

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Atom D2550
29,700 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Atom D2550  vs
Athlon II X3 405e 
Clock speed 1.86 GHz 2.3 GHz
Cores Dual core Tri 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 No Yes

power consumption

TDP 10W 45W
Annual home energy cost 2.41 $/year 10.84 $/year
Annual commercial energy cost 8.76 $/year 39.42 $/year
Performance per watt 3.59 pt/W 1.59 pt/W
Typical power consumption 8.13W 36.56W

details

Atom D2550  vs
Athlon II X3 405e 
Architecture x86-64 x86-64
Threads 4 3
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 0.67 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 1
Voltage range 0.91 - 1.21V 0.78 - 1.25V
Operating temperature Unknown - 100°C Unknown - 71°C

overclocking

Overclocked clock speed 1.87 GHz 3.45 GHz
Overclocked clock speed (Water) 1.87 GHz 2.3 GHz
Overclocked clock speed (Air) 1.87 GHz 3.45 GHz

integrated graphics

GPU GPU None
Label Integrated N/A
Number of displays supported 2 N/A
GPU clock speed 640 MHz N/A
Intel Atom D2550
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AMD Athlon II X3 405e
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