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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 1.6 GHz More than 65% higher clock speed
Much better overclocked clock speed (Air) 4.38 GHz vs 1.6 GHz Around 2.8x better overclocked clock speed (Air)
More cores 4 vs 2 Twice as many cores; run more applications at once
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
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
More threads 8 vs 4 Twice as many threads
Much better overclocked clock speed (Water) 4.46 GHz vs 1.6 GHz More than 2.8x better overclocked clock speed (Water)
Supports more RAM 24,576 MB vs 8,192 MB Supports 3x more RAM
Front view of Intel Atom S1269

Reasons to consider the
Intel Atom S1269

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Much lower typical power consumption 9.51W vs 105.63W 11.1x lower typical power consumption
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Much lower annual commercial energy cost 10.25 $/year vs 113.88 $/year 11.1x lower annual commercial energy cost
Much lower annual home energy cost 2.82 $/year vs 31.32 $/year 11.1x lower annual home energy cost
Newer Dec, 2012 vs Mar, 2009 Release date over 3 years later

Features Key features of the Xeon W3520  vs Atom S1269 

clock speed

Xeon W3520
2.66 GHz
Atom S1269
1.6 GHz

L2 cache

overclocked clock speed (air)

Xeon W3520
4.38 GHz
Atom S1269
1.6 GHz

overclocked clock speed (water)

Xeon W3520
4.46 GHz
Atom S1269
1.6 GHz

TDP

Xeon W3520
130W
Atom S1269
11.7W

Specifications Full list of technical specs

summary

Xeon W3520  vs
Atom S1269 
Clock speed 2.66 GHz 1.6 GHz
Cores Quad core Dual core

features

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

power consumption

TDP 130W 11.7W
Annual home energy cost 31.32 $/year 2.82 $/year
Annual commercial energy cost 113.88 $/year 10.25 $/year
Typical power consumption 105.63W 9.51W

bus

Architecture QPI FSB
Number of links 1 1

details

Xeon W3520  vs
Atom S1269 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.38 GHz 1.6 GHz
Overclocked clock speed (Water) 4.46 GHz 1.6 GHz
Overclocked clock speed (Air) 4.38 GHz 1.6 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 Single Channel
Supports ECC Yes Yes
Maximum bandwidth 25,599.99 MB/s 10,666.66 MB/s
Maximum memory size 24,576 MB 8,192 MB
Intel Xeon W3520
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Intel Atom S1269
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