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Differences What are the advantages of each

Front view of Qualcomm Snapdragon S2 (MSM8255)

Reasons to consider the
Qualcomm Snapdragon S2 (MSM8255)

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Newer Apr, 2010 vs Jan, 2010 Release date 2 months later
Front view of AMD Athlon II X2 255

Reasons to consider the
AMD Athlon II X2 255

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Much higher clock speed 3.1 GHz vs 1.4 GHz Around 2.2x higher clock speed
Much more l2 cache 2 MB vs 0.26 MB More than 7.8x more l2 cache; more data can be stored in the l2 cache for quick access later
More advanced architecture x86-64 vs ARM A 64-bit architecture allows more RAM to be installed and accessed by the processor
Much better overclocked clock speed (Air) 3.8 GHz vs 1.46 GHz More than 2.5x better overclocked clock speed (Air)
Much more l2 cache per core 1 MB/core vs 0.26 MB/core Around 4x more l2 cache per core
Much better overclocked clock speed (Water) 3.93 GHz vs 1 GHz Around 4x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once

Benchmarks Real world tests of Snapdragon S2 (MSM8255) vs Athlon II X2 255

Specifications Full list of technical specs

summary

Snapdragon S2 (MSM8255)  vs
Athlon II X2 255 
Clock speed 1.4 GHz 3.1 GHz
Cores Single core Dual core

overclocking

Overclocked clock speed 1.46 GHz 3.8 GHz
Overclocked clock speed (Water) 1 GHz 3.93 GHz
Overclocked clock speed (Air) 1.46 GHz 3.8 GHz

power consumption

Typical power consumption N/A 116.42W

details

Snapdragon S2 (MSM8255)  vs
Athlon II X2 255 
Architecture ARM x86-64
Threads 1 2
L2 cache 0.26 MB 2 MB
L2 cache per core 0.26 MB/core 1 MB/core
Manufacture process 45 nm 45 nm

integrated graphics

GPU GPU None
Label Adreno 205 N/A
Qualcomm Snapdragon S2 (MSM8255)
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AMD Athlon II X2 255
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