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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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Much higher clock speed 2.53 GHz vs 1.87 GHz More than 35% higher clock speed
Much higher turbo clock speed 2.93 GHz vs 1.87 GHz More than 55% higher turbo clock speed
Lower typical power consumption 69.06W vs 77.19W More than 10% lower typical power consumption
Lower annual commercial energy cost 74.46 $/year vs 83.22 $/year More than 10% lower annual commercial energy cost
Lower annual home energy cost 20.48 $/year vs 22.89 $/year More than 10% lower annual home energy cost
Front view of Intel Xeon E7520

Reasons to consider the
Intel Xeon E7520

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Much more l3 cache 18 MB vs 8 MB 2.2x more l3 cache; more data can be stored in the l3 cache for quick access later
Much more l3 cache per core 4.5 MB/core vs 2 MB/core 2.2x more l3 cache per core
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration

Features Key features of the Xeon EC5549  vs E7520 

clock speed

Xeon EC5549
2.53 GHz
Xeon E7520
1.87 GHz

turbo clock speed

Xeon EC5549
2.93 GHz
Xeon E7520
1.87 GHz

L2 cache

L3 cache

Xeon E7520
18 MB

TDP

Specifications Full list of technical specs

summary

Xeon EC5549  vs
E7520 
Clock speed 2.53 GHz 1.87 GHz
Turbo clock speed 2.93 GHz 1.87 GHz
Cores Quad core Quad core
Socket type
LGA 1366
LGA 1567

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

power consumption

TDP 85W 95W
Annual home energy cost 20.48 $/year 22.89 $/year
Annual commercial energy cost 74.46 $/year 83.22 $/year
Typical power consumption 69.06W 77.19W

details

Xeon EC5549  vs
E7520 
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 18 MB
L3 cache per core 2 MB/core 4.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 2 4
Voltage range 1 - 1.5V 0.68 - 1.35V
Operating temperature Unknown - 77.6°C Unknown - 70°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 1 4
Data rate 23,480 MB/s 76,800 MB/s
Transfer rate 5,870 MT/s 4,800 MT/s
Clock speed 2,935 MHz 2,400 MHz
Intel Xeon EC5549
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Intel Xeon E7520
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