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Differences What are the advantages of each

Front view of Intel Xeon E7420

Reasons to consider the
Intel Xeon E7420

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Much more l2 cache 8 MB vs 1 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
Supports more CPUs in SMP configuration 32 vs 2 30 supports more CPUs in SMP configuration
Much more l2 cache per core 2 MB/core vs 0.25 MB/core 8x more l2 cache per core
Front view of Intel Xeon E5520

Reasons to consider the
Intel Xeon E5520

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Higher clock speed 2.26 GHz vs 2.13 GHz More than 5% higher clock speed
Much better overclocked clock speed (Air) 3.28 GHz vs 2.13 GHz Around 55% better overclocked clock speed (Air)
More threads 8 vs 4 Twice as many threads
Much better overclocked clock speed (Water) 4.27 GHz vs 2.13 GHz More than 2x better overclocked clock speed (Water)
Lower typical power consumption 65W vs 73.13W More than 10% lower typical power consumption
Lower annual commercial energy cost 70.08 $/year vs 78.84 $/year More than 10% lower annual commercial energy cost
Lower annual home energy cost 19.27 $/year vs 21.68 $/year More than 10% lower annual home energy cost
Newer Mar, 2009 vs Sep, 2008 Release date 6 months later

Features Key features of the Xeon E7420  vs E5520 

clock speed

Xeon E7420
2.13 GHz
Xeon E5520
2.26 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon E7420
2.13 GHz
Xeon E5520
3.28 GHz

overclocked clock speed (water)

Xeon E7420
2.13 GHz
Xeon E5520
4.27 GHz

TDP

Specifications Full list of technical specs

summary

Xeon E7420  vs
E5520 
Clock speed 2.13 GHz 2.26 GHz
Cores Quad core Quad core
Socket type
604
LGA 1366

features

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

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

details

Xeon E7420  vs
E5520 
Architecture x86-64 x86-64
Threads 4 8
L2 cache 8 MB 1 MB
L2 cache per core 2 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 45 nm
Transistor count 1,900,000,000 731,000,000
Max CPUs 32 2
Clock multiplier 8 17
Voltage range 0.9 - 1.45V 0.75 - 1.35V
Operating temperature Unknown - 68°C Unknown - 72°C

overclocking

Overclocked clock speed 2.13 GHz 3.28 GHz
Overclocked clock speed (Water) 2.13 GHz 4.27 GHz
Overclocked clock speed (Air) 2.13 GHz 3.28 GHz

power consumption

TDP 90W 80W
Annual home energy cost 21.68 $/year 19.27 $/year
Annual commercial energy cost 78.84 $/year 70.08 $/year
Typical power consumption 73.13W 65W

bus

Architecture FSB QPI
Number of links 1 2
Clock speed 1,066 MHz 2,930 MHz
Intel Xeon E7420
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Intel Xeon E5520
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