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Differences What are the advantages of each

Front view of Intel Xeon E7520

Reasons to consider the
Intel Xeon E7520

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Much more l3 cache 18 MB vs 12 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
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
Much more l3 cache per core 4.5 MB/core vs 2 MB/core 2.2x more l3 cache per core
Lower typical power consumption 77.19W vs 85.31W Around 10% lower typical power consumption
Lower annual commercial energy cost 83.22 $/year vs 91.98 $/year Around 10% lower annual commercial energy cost
Lower annual home energy cost 22.89 $/year vs 25.29 $/year Around 10% lower annual home energy cost
Front view of Intel Xeon E7-4809 v2

Reasons to consider the
Intel Xeon E7-4809 v2

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More cores 6 vs 4 2 more cores; run more applications at once
More l2 cache 1.5 MB vs 1 MB 50% more l2 cache; more data can be stored in the l2 cache for quick access later
More threads 12 vs 8 4 more threads
Newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Newer Feb, 2014 vs Mar, 2010 Release date over 3 years later

Features Key features of the Xeon E7520  vs E7-4809 v2 

clock speed

Xeon E7520
1.87 GHz
Xeon E7-4809 v2
1.9 GHz

L2 cache

L3 cache

Specifications Full list of technical specs

summary

Xeon E7520  vs
E7-4809 v2 
Clock speed 1.87 GHz 1.9 GHz
Cores Quad core Hexa core
Socket type
LGA 1567
LGA 2011

features

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

power consumption

TDP 95W 105W
Annual home energy cost 22.89 $/year 25.29 $/year
Annual commercial energy cost 83.22 $/year 91.98 $/year
Typical power consumption 77.19W 85.31W

details

Xeon E7520  vs
E7-4809 v2 
Threads 8 12
L2 cache 1 MB 1.5 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 18 MB 12 MB
L3 cache per core 4.5 MB/core 2 MB/core
Manufacture process 45 nm 22 nm
Max CPUs 4 4
Operating temperature Unknown - 70°C Unknown - 68°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

bus

Architecture QPI QPI
Number of links 4 3
Data rate 76,800 MB/s 76,800 MB/s
Transfer rate 4,800 MT/s 6,400 MT/s
Clock speed 2,400 MHz 3,200 MHz
Intel Xeon E7520
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Intel Xeon E7-4809 v2
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