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Differences What are the advantages of each

Front view of AMD Athlon II X2 255

Reasons to consider the
AMD Athlon II X2 255

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Much 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
Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly higher clock speed 3.1 GHz vs 2.6 GHz Around 20% higher clock speed
Much better PassMark (Single core) score 1,046 vs 779 Around 35% better PassMark (Single core) score
Much better geekbench 2 (32-bit) score 2,803 vs 1,857 More than 50% better geekbench 2 (32-bit) score
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Air) 3.8 GHz vs 3.13 GHz More than 20% better overclocked clock speed (Air)
Significantly higher Maximum operating temperature 74 °C vs 70 °C More than 5% higher Maximum operating temperature
Significantly better overclocked clock speed (Water) 3.93 GHz vs 3.39 GHz More than 15% better overclocked clock speed (Water)
Newer Jan, 2010 vs Dec, 2006 Release date over 3 years later
Front view of AMD Athlon 64 X2 5000+

Reasons to consider the
AMD Athlon 64 X2 5000+

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much lower typical power consumption 72.31W vs 116.42W Around 40% lower typical power consumption
Much lower annual home energy cost 21.44 $/year vs 42.79 $/year Around 50% lower annual home energy cost
Much lower annual commercial energy cost 77.96 $/year vs 113.7 $/year More than 30% lower annual commercial energy cost

Benchmarks Real world tests of Athlon II X2 255 vs 64 X2 5000+

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 255
125,000 MB/s
Athlon 64 X2 5000+
64.85 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 255  vs
64 X2 5000+ 
Clock speed 3.1 GHz 2.6 GHz
Cores Dual core Dual core
Socket type
AM3
AM2
Is unlocked No Yes

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

details

Athlon II X2 255  vs
64 X2 5000+ 
Threads 2 2
L2 cache 2 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 1 1
Operating temperature Unknown - 74°C Unknown - 70°C

overclocking

Overclocked clock speed 3.8 GHz 3.13 GHz
Overclocked clock speed (Water) 3.93 GHz 3.39 GHz
PassMark (Overclocked) 1,567.5 1,518.5
Overclocked clock speed (Air) 3.8 GHz 3.13 GHz

power consumption

TDP 65W 89W
Annual home energy cost 42.79 $/year 21.44 $/year
Annual commercial energy cost 113.7 $/year 77.96 $/year
Performance per watt 0.8 pt/W 0.61 pt/W
Typical power consumption 116.42W 72.31W
AMD Athlon II X2 255
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AMD Athlon 64 X2 5000+
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