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Differences What are the advantages of each

Front view of Intel Xeon EC5549

Reasons to consider the
Intel Xeon EC5549

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Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
More threads 8 vs 4 Twice as many threads
Newer Feb, 2010 vs Jan, 2008 Release date over 2 years later
Front view of Intel Core2 Quad Q9450S

Reasons to consider the
Intel Core2 Quad Q9450S

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Much more l2 cache 12 MB vs 1 MB 12x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 3 MB/core vs 0.25 MB/core 12x more l2 cache per core
Lower typical power consumption 52.81W vs 69.06W Around 25% lower typical power consumption
Lower annual home energy cost 15.66 $/year vs 20.48 $/year Around 25% lower annual home energy cost
Lower annual commercial energy cost 56.94 $/year vs 74.46 $/year Around 25% lower annual commercial energy cost

Features Key features of the Xeon EC5549  vs Core2 Quad Q9450S 

clock speed

Xeon EC5549
2.53 GHz

L2 cache

Specifications Full list of technical specs

summary

Xeon EC5549  vs
Core2 Quad Q9450S 
Clock speed 2.53 GHz 2.67 GHz
Cores Quad core Quad core
Socket type
LGA 1366
LGA 775

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

details

Xeon EC5549  vs
Core2 Quad Q9450S 
Threads 8 4
L2 cache 1 MB 12 MB
L2 cache per core 0.25 MB/core 3 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 2 1

power consumption

TDP 85W 65W
Annual home energy cost 20.48 $/year 15.66 $/year
Annual commercial energy cost 74.46 $/year 56.94 $/year
Typical power consumption 69.06W 52.81W

bus

Clock speed 2,935 MHz 1,333 MHz
Intel Xeon EC5549
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Intel Core2 Quad Q9450S
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