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Differences What are the advantages of each

Front view of AMD Athlon II X2 255e

Reasons to consider the
AMD Athlon II X2 255e

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Much higher clock speed 3.1 GHz vs 2 GHz More than 55% higher clock speed
More cores 2 vs 1 Twice as many cores; run more applications at once
More threads 2 vs 1 Twice as many threads
Front view of AMD Athlon II 170u

Reasons to consider the
AMD Athlon II 170u

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Much lower typical power consumption 16.25W vs 36.56W 2.2x lower typical power consumption
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much lower annual home energy cost 4.82 $/year vs 10.84 $/year 2.2x lower annual home energy cost
Much lower annual commercial energy cost 17.52 $/year vs 39.42 $/year 2.2x lower annual commercial energy cost

Features Key features of the Athlon II X2 255e  vs 170u 

clock speed

L2 cache

Specifications Full list of technical specs

summary

Athlon II X2 255e  vs
170u 
Clock speed 3.1 GHz 2 GHz
Cores Dual core Single core

features

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

details

Athlon II X2 255e  vs
170u 
Threads 2 1
L2 cache 2 MB 1 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Operating temperature Unknown - 72°C Unknown - 80°C

power consumption

TDP 45W 20W
Annual home energy cost 10.84 $/year 4.82 $/year
Annual commercial energy cost 39.42 $/year 17.52 $/year
Typical power consumption 36.56W 16.25W

bus

Clock speed 2,000 MHz 1,800 MHz
AMD Athlon II X2 255e
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AMD Athlon II 170u
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