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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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Much more l3 cache 8 MB vs 2 MB 4x more l3 cache; more data can be stored in the l3 cache for quick access later
Much better overclocked clock speed (Air) 3.28 GHz vs 2.43 GHz More than 35% better overclocked clock speed (Air)
More threads 8 vs 4 Twice as many threads
Newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l3 cache per core 2 MB/core vs 0.5 MB/core 4x more l3 cache per core
Much better overclocked clock speed (Water) 4.27 GHz vs 2.3 GHz More than 85% better overclocked clock speed (Water)
Newer Mar, 2009 vs Apr, 2008 Release date 11 months later
Front view of AMD Opteron 8356

Reasons to consider the
AMD Opteron 8356

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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
Supports more CPUs in SMP configuration 8 vs 2 6 supports more CPUs in SMP configuration
Slightly higher clock speed 2.3 GHz vs 2.26 GHz Almost the same
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Benchmarks Real world tests of Xeon E5520 vs Opteron 8356

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5520
12,384
Opteron 8356
13,936

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5520
1,701
Opteron 8356
977.5

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5520
102,200 MB/s
Opteron 8356
79.5 MB/s

Specifications Full list of technical specs

summary

Xeon E5520  vs
Opteron 8356 
Clock speed 2.26 GHz 2.3 GHz
Cores Quad core Quad core
Socket type
LGA 1366
F

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 75W
Annual home energy cost 19.27 $/year 18.07 $/year
Annual commercial energy cost 70.08 $/year 65.7 $/year
Performance per watt 2.4 pt/W 2.16 pt/W
Typical power consumption 65W 60.94W

bus

Clock speed 2,930 MHz 1,000 MHz

details

Xeon E5520  vs
Opteron 8356 
Threads 8 4
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB 2 MB
L3 cache per core 2 MB/core 0.5 MB/core
Manufacture process 45 nm 65 nm
Max CPUs 2 8
Clock multiplier 17 11
Voltage range 0.75 - 1.35V 1 - UnknownV
Operating temperature Unknown - 72°C 0 - 55°C

overclocking

Overclocked clock speed 3.28 GHz 2.43 GHz
Overclocked clock speed (Water) 4.27 GHz 2.3 GHz
Overclocked clock speed (Air) 3.28 GHz 2.43 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
Intel Xeon E5520
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AMD Opteron 8356
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