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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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Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Newer Apr, 2010 vs Jul, 2006 Release date over 3 years later
Front view of Intel Pentium D 915

Reasons to consider the
Intel Pentium D 915

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Much more l2 cache 4 MB vs 0.26 MB More than 15.5x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 2.8 GHz vs 1.4 GHz 2x higher clock speed
More advanced architecture x86-64 vs ARM A 64-bit architecture allows more RAM to be installed and accessed by the processor
Much more l2 cache per core 2 MB/core vs 0.26 MB/core More than 7.8x more l2 cache per core
Much better overclocked clock speed (Air) 3.92 GHz vs 1.46 GHz Around 2.8x better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.43 GHz vs 1 GHz Around 4.5x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once

Features Key features of the Snapdragon S2 (MSM8255)  vs Pentium D 915 

clock speed

L2 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Snapdragon S2 (MSM8255)  vs
Pentium D 915 
Clock speed 1.4 GHz 2.8 GHz
Cores Single core Dual core

overclocking

Overclocked clock speed 1.46 GHz 3.92 GHz
Overclocked clock speed (Water) 1 GHz 4.43 GHz
Overclocked clock speed (Air) 1.46 GHz 3.92 GHz

power consumption

Typical power consumption N/A 77.19W

details

Snapdragon S2 (MSM8255)  vs
Pentium D 915 
Architecture ARM x86-64
Threads 1 2
L2 cache 0.26 MB 4 MB
L2 cache per core 0.26 MB/core 2 MB/core
Manufacture process 45 nm 65 nm

integrated graphics

GPU GPU None
Label Adreno 205 N/A

memory controller

Memory controller Built-in Built-in
Qualcomm Snapdragon S2 (MSM8255)
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Intel Pentium D 915
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