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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 2 GHz Around 35% higher clock speed
More threads 8 vs 4 Twice as many threads
Front view of Intel Xeon EC5509

Reasons to consider the
Intel Xeon EC5509

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Much lower typical power consumption 69.06W vs 105.63W Around 35% lower typical power consumption
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much lower annual commercial energy cost 74.46 $/year vs 113.88 $/year Around 35% lower annual commercial energy cost
Much lower annual home energy cost 20.48 $/year vs 31.32 $/year Around 35% lower annual home energy cost
Newer Feb, 2010 vs Mar, 2009 Release date 10 months later

Features Key features of the Xeon W3520  vs EC5509 

clock speed

Xeon W3520
2.66 GHz
Xeon EC5509
2 GHz

L2 cache

L3 cache

TDP

Specifications Full list of technical specs

summary

Xeon W3520  vs
EC5509 
Clock speed 2.66 GHz 2 GHz
Cores Quad core Quad core
Socket type
LGA 1366

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
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 130W 85W
Annual home energy cost 31.32 $/year 20.48 $/year
Annual commercial energy cost 113.88 $/year 74.46 $/year
Typical power consumption 105.63W 69.06W

bus

Architecture QPI QPI
Number of links 1 1
Data rate 19,200 MB/s 19,200 MB/s
Transfer rate 4,800 MT/s 4,800 MT/s
Clock speed 2,400 MHz 2,400 MHz

details

Xeon W3520  vs
EC5509 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 2
Voltage range 0.8 - 1.38V 1 - 1.5V
Operating temperature Unknown - 67.9°C Unknown - 77.6°C

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
Channels Triple Channel Triple Channel
Supports ECC Yes Yes
Intel Xeon W3520
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Intel Xeon EC5509
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