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Differences What are the advantages of each

Front view of Intel Xeon E5520

Reasons to consider the
Intel Xeon E5520

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More cores 4 vs 2 Twice as many cores; run more applications at once
Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More threads 8 vs 2 6 more threads
Much better overclocked clock speed (Air) 3.28 GHz vs 2.2 GHz Around 50% better overclocked clock speed (Air)
Higher clock speed 2.26 GHz vs 2.2 GHz Around 5% higher clock speed
Much better overclocked clock speed (Water) 4.27 GHz vs 2.2 GHz Around 95% better overclocked clock speed (Water)
Newer Mar, 2009 vs May, 2005 Release date over 3 years later
Front view of AMD Opteron 275

Reasons to consider the
AMD Opteron 275

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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 E5520 vs Opteron 275

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5520
12,384
Opteron 275
2,534

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5520
102,200 MB/s
Opteron 275
60,200 MB/s

PassMark Data courtesy Passmark

Xeon E5520
4,453
Opteron 275
1,291

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E5520  vs
Opteron 275 
Clock speed 2.26 GHz 2.2 GHz
Cores Quad core Dual core
Socket type
LGA 1366
940

features

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

details

Xeon E5520  vs
Opteron 275 
Threads 8 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 2 2
Clock multiplier 17 11
Voltage range 0.75 - 1.35V 1.2 - UnknownV
Operating temperature Unknown - 72°C 0 - 67°C

overclocking

Overclocked clock speed 3.28 GHz 2.2 GHz
Overclocked clock speed (Water) 4.27 GHz 2.2 GHz
Overclocked clock speed (Air) 3.28 GHz 2.2 GHz

power consumption

TDP 80W 85W
Annual home energy cost 19.27 $/year 20.48 $/year
Annual commercial energy cost 70.08 $/year 74.46 $/year
Performance per watt 2.4 pt/W 0.87 pt/W
Typical power consumption 65W 69.06W
Intel Xeon E5520
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AMD Opteron 275
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