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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 0.5 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 3.1 GHz vs 2.2 GHz More than 40% higher clock speed
Much better PassMark score 1,843 vs 544 Around 3.5x better PassMark score
Much better PassMark (Single core) score 1,046 vs 653 More than 60% better PassMark (Single core) score
Much better geekbench 2 (32-bit) score 2,803 vs 824 Around 3.5x better geekbench 2 (32-bit) score
More cores 2 vs 1 Twice as many cores; run more applications at once
More threads 2 vs 1 Twice as many threads
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Front view of AMD Athlon 64 3400+

Reasons to consider the
AMD Athlon 64 3400+

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CPUBoss is not aware of any important advantages of the Athlon 64 3400+ vs the Athlon II X2 255.

Benchmarks Real world tests of Athlon II X2 255 vs 64 3400+

GeekBench (32-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 3400+ 
Clock speed 3.1 GHz 2.2 GHz
Cores Dual core Single core
Socket type
AM3
939

features

Has a NX bit Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!

details

Athlon II X2 255  vs
64 3400+ 
Threads 2 1
L2 cache 2 MB 0.5 MB
L2 cache per core 1 MB/core 0.5 MB/core
Max CPUs 1 1

power consumption

Typical power consumption 116.42W N/A
AMD Athlon II X2 255
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AMD Athlon 64 3400+
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