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Differences What are the advantages of each

Front view of Intel Xeon L5609

Reasons to consider the
Intel Xeon L5609

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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
Supports more RAM 294,912 MB vs 65,536 MB Supports 4.5x more RAM
Much better overclocked clock speed (Air) 2.83 GHz vs 2.4 GHz Around 20% better overclocked clock speed (Air)
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Front view of Intel Atom C2538

Reasons to consider the
Intel Atom C2538

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Much higher clock speed 2.4 GHz vs 1.86 GHz Around 30% higher clock speed
Lower typical power consumption 12.19W vs 32.5W 2.7x lower typical power consumption
Newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Water) 2.4 GHz vs 1.87 GHz Around 30% better overclocked clock speed (Water)
Newer Jul, 2013 vs Mar, 2010 Release date over 3 years later
Lower annual commercial energy cost 13.14 $/year vs 35.04 $/year 2.7x lower annual commercial energy cost
Lower annual home energy cost 3.61 $/year vs 9.64 $/year 2.7x lower annual home energy cost

Features Key features of the Xeon L5609  vs Atom C2538 

clock speed

Xeon L5609
1.86 GHz
Atom C2538
2.4 GHz

overclocked clock speed (air)

Xeon L5609
2.83 GHz
Atom C2538
2.4 GHz

overclocked clock speed (water)

Xeon L5609
1.87 GHz
Atom C2538
2.4 GHz

TDP

Specifications Full list of technical specs

summary

Xeon L5609  vs
Atom C2538 
Clock speed 1.86 GHz 2.4 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 40W 15W
Annual home energy cost 9.64 $/year 3.61 $/year
Annual commercial energy cost 35.04 $/year 13.14 $/year
Typical power consumption 32.5W 12.19W

bus

Architecture QPI FSB
Number of links 2 1

details

Xeon L5609  vs
Atom C2538 
Architecture x86-64 x86-64
Threads 4 4
Manufacture process 32 nm 22 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 2.83 GHz 2.4 GHz
Overclocked clock speed (Water) 1.87 GHz 2.4 GHz
Overclocked clock speed (Air) 2.83 GHz 2.4 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
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 25,599.99 MB/s 12,800 MB/s
Maximum memory size 294,912 MB 65,536 MB
Intel Xeon L5609
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Intel Atom C2538
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