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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 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
More threads 8 vs 4 Twice as many threads
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
Front view of Intel Xeon E3-1220

Reasons to consider the
Intel Xeon E3-1220

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Much higher clock speed 3.1 GHz vs 1.87 GHz More than 65% higher clock speed
Much higher turbo clock speed 3.4 GHz vs 1.87 GHz More than 80% higher turbo clock speed
Much better overclocked clock speed (Air) 3.49 GHz vs 1.87 GHz More than 85% better overclocked clock speed (Air)
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Water) 3.1 GHz vs 1.87 GHz More than 65% better overclocked clock speed (Water)
Lower typical power consumption 65W vs 77.19W More than 15% lower typical power consumption
Lower annual commercial energy cost 70.08 $/year vs 83.22 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 19.27 $/year vs 22.89 $/year More than 15% lower annual home energy cost
Newer Apr, 2011 vs Mar, 2010 Release date a year later

Features Key features of the Xeon E7520  vs E3-1220 

clock speed

Xeon E7520
1.87 GHz
Xeon E3-1220
3.1 GHz

turbo clock speed

Xeon E7520
1.87 GHz
Xeon E3-1220
3.4 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon E7520
1.87 GHz
Xeon E3-1220
3.49 GHz

overclocked clock speed (water)

Xeon E7520
1.87 GHz
Xeon E3-1220
3.1 GHz

Specifications Full list of technical specs

summary

Xeon E7520  vs
E3-1220 
Clock speed 1.87 GHz 3.1 GHz
Turbo clock speed 1.87 GHz 3.4 GHz
Cores Quad core Quad core
Socket type
LGA 1567
LGA 1155

features

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

power consumption

TDP 95W 80W
Annual home energy cost 22.89 $/year 19.27 $/year
Annual commercial energy cost 83.22 $/year 70.08 $/year
Typical power consumption 77.19W 65W

details

Xeon E7520  vs
E3-1220 
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 18 MB 8 MB
L3 cache per core 4.5 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 4 1
Operating temperature Unknown - 70°C Unknown - 69.1°C

overclocking

Overclocked clock speed 1.87 GHz 3.49 GHz
Overclocked clock speed (Water) 1.87 GHz 3.1 GHz
Overclocked clock speed (Air) 1.87 GHz 3.49 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 DMI
Number of links 4 1
Transfer rate 4,800 MT/s 5,000 MT/s
Intel Xeon E7520
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Intel Xeon E3-1220
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