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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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Significantly higher clock speed 1.87 GHz vs 1.6 GHz More than 15% higher clock speed
Significantly more l3 cache 18 MB vs 15 MB 20% 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 2.5 MB/core 80% more l3 cache per core
More threads 8 vs 6 2 more threads
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Better overclocked clock speed (Air) 1.87 GHz vs 1.68 GHz More than 10% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 1.87 GHz vs 1.6 GHz More than 15% better overclocked clock speed (Water)
Front view of Intel Xeon E5-2603 v3

Reasons to consider the
Intel Xeon E5-2603 v3

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More cores 6 vs 4 2 more cores; run more applications at once
Newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Lower typical power consumption 69.06W vs 77.19W More than 10% lower typical power consumption
Newer Jul, 2014 vs Mar, 2010 Release date over 4 years later
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

Features Key features of the Xeon E7520  vs E5-2603 v3 

clock speed

Xeon E7520
1.87 GHz
Xeon E5-2603 v3
1.6 GHz

L3 cache

overclocked clock speed (air)

Xeon E7520
1.87 GHz
Xeon E5-2603 v3
1.68 GHz

overclocked clock speed (water)

Xeon E7520
1.87 GHz
Xeon E5-2603 v3
1.6 GHz

Specifications Full list of technical specs

summary

Xeon E7520  vs
E5-2603 v3 
Clock speed 1.87 GHz 1.6 GHz
Cores Quad core Hexa core

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
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

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

details

Xeon E7520  vs
E5-2603 v3 
Threads 8 6
L3 cache 18 MB 15 MB
L3 cache per core 4.5 MB/core 2.5 MB/core
Manufacture process 45 nm 22 nm
Max CPUs 4 2
Operating temperature Unknown - 70°C Unknown - 72.8°C

overclocking

Overclocked clock speed 1.87 GHz 1.68 GHz
Overclocked clock speed (Water) 1.87 GHz 1.6 GHz
Overclocked clock speed (Air) 1.87 GHz 1.68 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

bus

Architecture QPI QPI
Number of links 4 2
Data rate 76,800 MB/s 51,200 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 E5-2603 v3
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