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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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Much more l3 cache 6 MB vs 0 MB Compared to all cpus, 6 MB l3 cache is just OK
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much more l3 cache per core 1.5 MB/core vs 0 MB/core Compared to all cpus, 1.5 MB/core l3 cache per core is just OK
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Higher clock speed 3.2 GHz vs 3.1 GHz Around 5% higher clock speed
Front view of AMD Athlon II X2 255e

Reasons to consider the
AMD Athlon II X2 255e

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Much lower typical power consumption 36.56W vs 101.56W 2.8x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much higher Maximum operating temperature 72 °C vs 62 °C More than 15% higher Maximum operating temperature
Much lower annual commercial energy cost 39.42 $/year vs 109.5 $/year 2.8x lower annual commercial energy cost
Much lower annual home energy cost 10.84 $/year vs 30.11 $/year 2.8x lower annual home energy cost

Features Key features of the Phenom II X4 955  vs Athlon II X2 255e 

clock speed

L2 cache

Specifications Full list of technical specs

summary

Phenom II X4 955  vs
Athlon II X2 255e 
Clock speed 3.2 GHz 3.1 GHz
Cores Quad core Dual core
Is unlocked Yes No

features

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

details

Phenom II X4 955  vs
Athlon II X2 255e 
Threads 4 2
L2 cache 2 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
L3 cache 6 MB 0 MB
L3 cache per core 1.5 MB/core 0 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Operating temperature Unknown - 62°C Unknown - 72°C

power consumption

TDP 125W 45W
Annual home energy cost 30.11 $/year 10.84 $/year
Annual commercial energy cost 109.5 $/year 39.42 $/year
Typical power consumption 101.56W 36.56W

bus

Clock speed 2,000 MHz 2,000 MHz
AMD Phenom II X4 955
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AMD Athlon II X2 255e
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