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Differences What are the advantages of each

Front view of AMD Phenom II X4 955

Reasons to consider the
AMD Phenom II X4 955

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More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
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 101.56W Around 50% lower typical power consumption
Higher clock speed 3.4 GHz vs 3.2 GHz More than 5% higher clock speed
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much lower annual home energy cost 15.66 $/year vs 30.11 $/year Around 50% lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 109.5 $/year Around 50% lower annual commercial energy cost
Newer May, 2011 vs Nov, 2009 Release date over 1 years later

Benchmarks Real world tests of Phenom II X4 955 vs Athlon II X2 270

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

Phenom II X4 955
129,850 MB/s
Athlon II X2 270
136,900 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

Phenom II X4 955  vs
Athlon II X2 270 
Clock speed 3.2 GHz 3.4 GHz
Cores Quad 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 2,000 MHz 3,400 MHz

details

Phenom II X4 955  vs
Athlon II X2 270 
Threads 4 2
L2 cache 2 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

Overclock popularity 259 1
Overclock review score 4 0
Overclocked clock speed 3.99 GHz 4.02 GHz
Overclocked clock speed (Water) 4.14 GHz 4.09 GHz
PassMark (Overclocked) 3,674.7 810.1
Overclocked clock speed (Air) 3.99 GHz 4.02 GHz

power consumption

TDP 125W 65W
Annual home energy cost 30.11 $/year 15.66 $/year
Annual commercial energy cost 109.5 $/year 56.94 $/year
Performance per watt 1.28 pt/W 2.03 pt/W
Typical power consumption 101.56W 52.81W
AMD Phenom II X4 955
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AMD Athlon II X2 270
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