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Differences What are the advantages of each

Front view of Intel Xeon E5620

Reasons to consider the
Intel Xeon E5620

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Much higher clock speed 2.4 GHz vs 2 GHz Around 20% higher clock speed
Much better overclocked clock speed (Air) 3.75 GHz vs 2 GHz Around 90% better overclocked clock speed (Air)
Much newer manufacturing process 32 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 4 vs 2 Twice as many cores; run more applications at once
Much better performance per watt 7.59 pt/W vs 0.47 pt/W More than 16.2x better performance per watt
More threads 8 vs 2 6 more threads
Much better overclocked clock speed (Water) 4.33 GHz vs 2 GHz Around 2.2x better overclocked clock speed (Water)
Lower typical power consumption 65W vs 77.19W More than 15% lower typical power consumption
Newer Mar, 2010 vs Jan, 2005 Release date over 5 years later
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
Front view of AMD Opteron 270

Reasons to consider the
AMD Opteron 270

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Much more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core

Benchmarks Real world tests of Xeon E5620 vs Opteron 270

PassMark Data courtesy Passmark

Xeon E5620
4,873
Opteron 270
1,083

Specifications Full list of technical specs

summary

Xeon E5620  vs
Opteron 270 
Clock speed 2.4 GHz 2 GHz
Cores Quad core Dual core
Socket type
LGA 1366
940

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Xeon E5620  vs
Opteron 270 
Threads 8 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 2 2
Clock multiplier 18 10
Voltage range 0.75 - 1.35V 1 - UnknownV
Operating temperature Unknown - 77.6°C 0 - 67°C

overclocking

Overclocked clock speed 3.75 GHz 2 GHz
Overclocked clock speed (Water) 4.33 GHz 2 GHz
Overclocked clock speed (Air) 3.75 GHz 2 GHz

power consumption

TDP 80W 95W
Annual home energy cost 19.27 $/year 22.89 $/year
Annual commercial energy cost 70.08 $/year 83.22 $/year
Performance per watt 7.59 pt/W 0.47 pt/W
Typical power consumption 65W 77.19W
Intel Xeon E5620
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AMD Opteron 270
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