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Differences What are the advantages of each

Front view of Intel Xeon W3520

Reasons to consider the
Intel Xeon W3520

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Much higher clock speed 2.66 GHz vs 1.25 GHz Around 2.2x higher clock speed
Much better overclocked clock speed (Air) 4.38 GHz vs 1.25 GHz More than 3.5x better overclocked clock speed (Air)
Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
More threads 8 vs 4 Twice as many threads
Much better overclocked clock speed (Water) 4.46 GHz vs 1.25 GHz More than 3.5x better overclocked clock speed (Water)
Front view of Intel Atom C2508

Reasons to consider the
Intel Atom C2508

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Much lower typical power consumption 7.72W vs 105.63W 13.7x lower typical power consumption
Newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower annual commercial energy cost 8.32 $/year vs 113.88 $/year 13.7x lower annual commercial energy cost
Much lower annual home energy cost 2.29 $/year vs 31.32 $/year 13.7x lower annual home energy cost
Newer Apr, 2014 vs Mar, 2009 Release date over 5 years later

Features Key features of the Xeon W3520  vs Atom C2508 

clock speed

Xeon W3520
2.66 GHz
Atom C2508
1.25 GHz

overclocked clock speed (air)

Xeon W3520
4.38 GHz
Atom C2508
1.25 GHz

overclocked clock speed (water)

Xeon W3520
4.46 GHz
Atom C2508
1.25 GHz

TDP

Specifications Full list of technical specs

summary

Xeon W3520  vs
Atom C2508 
Clock speed 2.66 GHz 1.25 GHz
Cores Quad core Quad core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes No

power consumption

TDP 130W 9.5W
Annual home energy cost 31.32 $/year 2.29 $/year
Annual commercial energy cost 113.88 $/year 8.32 $/year
Typical power consumption 105.63W 7.72W

bus

Architecture QPI FSB
Number of links 1 1

details

Xeon W3520  vs
Atom C2508 
Threads 8 4
Manufacture process 45 nm 22 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.38 GHz 1.25 GHz
Overclocked clock speed (Water) 4.46 GHz 1.25 GHz
Overclocked clock speed (Air) 4.38 GHz 1.25 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 25,599.99 MB/s 21,333.32 MB/s
Maximum memory size 24,576 MB 32,768 MB
Intel Xeon W3520
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Intel Atom C2508
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