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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 lower typical power consumption 65W vs 113.75W Around 45% lower typical power consumption
Much more l3 cache per core 3 MB/core vs 0.98 MB/core More than 3x more l3 cache per core
Much better overclocked clock speed (Air) 3.75 GHz vs 3.4 GHz More than 10% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.33 GHz vs 3.4 GHz Around 30% better overclocked clock speed (Water)
Much lower annual commercial energy cost 70.08 $/year vs 122.64 $/year Around 45% lower annual commercial energy cost
Much lower annual home energy cost 19.27 $/year vs 33.73 $/year Around 45% lower annual home energy cost
Front view of AMD Opteron 6284 SE

Reasons to consider the
AMD Opteron 6284 SE

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Much more l2 cache 16 MB vs 1 MB 16x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher turbo clock speed 3.4 GHz vs 2.66 GHz Around 30% higher turbo clock speed
Much higher clock speed 2.7 GHz vs 2.4 GHz Around 15% higher clock speed
Much more l3 cache 15.63 MB vs 12 MB More than 30% more l3 cache; more data can be stored in the l3 cache for quick access later
More cores 16 vs 4 12 more cores; run more applications at once
More threads 16 vs 8 Twice as many threads
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Newer Jun, 2012 vs Mar, 2010 Release date over 2 years later

Features Key features of the Xeon E5620  vs Opteron 6284 SE 

clock speed

Xeon E5620
2.4 GHz
Opteron 6284 SE
2.7 GHz

turbo clock speed

Xeon E5620
2.66 GHz
Opteron 6284 SE
3.4 GHz

L2 cache

L3 cache

Xeon E5620
12 MB
Opteron 6284 SE
15.63 MB

overclocked clock speed (air)

Xeon E5620
3.75 GHz
Opteron 6284 SE
3.4 GHz

overclocked clock speed (water)

Xeon E5620
4.33 GHz
Opteron 6284 SE
3.4 GHz

Specifications Full list of technical specs

summary

Xeon E5620  vs
Opteron 6284 SE 
Clock speed 2.4 GHz 2.7 GHz
Turbo clock speed 2.66 GHz 3.4 GHz
Cores Quad core 16 core
Socket type
LGA 1366
G34

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES

power consumption

TDP 80W 140W
Annual home energy cost 19.27 $/year 33.73 $/year
Annual commercial energy cost 70.08 $/year 122.64 $/year
Typical power consumption 65W 113.75W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3-800
DDR3

details

Xeon E5620  vs
Opteron 6284 SE 
Threads 8 16
L2 cache 1 MB 16 MB
L2 cache per core 0.25 MB/core 1 MB/core
L3 cache 12 MB 15.63 MB
L3 cache per core 3 MB/core 0.98 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 4
Clock multiplier 18 13
Operating temperature Unknown - 77.6°C Unknown - 64.4°C

overclocking

Overclocked clock speed 3.75 GHz 3.4 GHz
Overclocked clock speed (Water) 4.33 GHz 3.4 GHz
Overclocked clock speed (Air) 3.75 GHz 3.4 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 HyperTransport 3.0
Number of links 2 4
Transfer rate 5,860 MT/s 6,400 MT/s
Clock speed 2,930 MHz 3,200 MHz
Intel Xeon E5620
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AMD Opteron 6284 SE
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