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Differences What are the advantages of each

Front view of AMD Athlon II X2 270

Reasons to consider the
AMD Athlon II X2 270

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Much lower typical power consumption 52.81W vs 116.42W 2.2x lower typical power consumption
Higher clock speed 3.4 GHz vs 3.1 GHz Around 10% higher clock speed
Much better performance per watt 2.03 pt/W vs 0.8 pt/W More than 2.5x better performance per watt
Significantly better overclocked clock speed (Air) 4.02 GHz vs 3.8 GHz More than 5% better overclocked clock speed (Air)
Much lower annual home energy cost 15.66 $/year vs 42.79 $/year 2.7x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 113.7 $/year Around 50% lower annual commercial energy cost
Newer May, 2011 vs Jan, 2010 Release date over 1 years later
Better overclocked clock speed (Water) 4.09 GHz vs 3.93 GHz Around 5% better overclocked clock speed (Water)
Front view of AMD Athlon II X2 255

Reasons to consider the
AMD Athlon II X2 255

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CPUBoss is not aware of any important advantages of the 255 vs the 270.

Benchmarks Real world tests of Athlon II X2 270 vs 255

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

Athlon II X2 270
136,900 MB/s
Athlon II X2 255
125,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Athlon II X2 270  vs
255 
Clock speed 3.4 GHz 3.1 GHz
Cores Dual core Dual core

features

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

bus

Clock speed 3,400 MHz 2,000 MHz

details

Athlon II X2 270  vs
255 
Threads 2 2
L2 cache 2 MB 2 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.02 GHz 3.8 GHz
Overclocked clock speed (Water) 4.09 GHz 3.93 GHz
PassMark (Overclocked) 810.1 1,567.5
Overclocked clock speed (Air) 4.02 GHz 3.8 GHz

power consumption

TDP 65W 65W
Annual home energy cost 15.66 $/year 42.79 $/year
Annual commercial energy cost 56.94 $/year 113.7 $/year
Performance per watt 2.03 pt/W 0.8 pt/W
Typical power consumption 52.81W 116.42W
AMD Athlon II X2 270
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AMD Athlon II X2 255
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