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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 1.8 GHz Around 35% higher clock speed
Much better overclocked clock speed (Air) 3.75 GHz vs 1.8 GHz More than 2x better overclocked clock speed (Air)
Much more l3 cache per core 3 MB/core vs 1.5 MB/core 2x more l3 cache per core
Much better overclocked clock speed (Water) 4.33 GHz vs 1.8 GHz Around 2.5x better overclocked clock speed (Water)
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Front view of AMD Opteron 6124 HE

Reasons to consider the
AMD Opteron 6124 HE

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Much more l2 cache 4 MB vs 1 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 8 vs 4 Twice as many cores; run more applications at once
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration

Features Key features of the Xeon E5620  vs Opteron 6124 HE 

clock speed

Xeon E5620
2.4 GHz
Opteron 6124 HE
1.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon E5620
3.75 GHz
Opteron 6124 HE
1.8 GHz

overclocked clock speed (water)

Xeon E5620
4.33 GHz
Opteron 6124 HE
1.8 GHz

Specifications Full list of technical specs

summary

Xeon E5620  vs
Opteron 6124 HE 
Clock speed 2.4 GHz 1.8 GHz
Cores Quad core Octa 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
3DNow!
Supplemental SSE3
AES

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 E5620  vs
Opteron 6124 HE 
Threads 8 8
L2 cache 1 MB 4 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 12 MB 12 MB
L3 cache per core 3 MB/core 1.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 4
Clock multiplier 18 9
Voltage range 0.75 - 1.35V 1 - UnknownV
Operating temperature Unknown - 77.6°C Unknown - 55°C

overclocking

Overclocked clock speed 3.75 GHz 1.8 GHz
Overclocked clock speed (Water) 4.33 GHz 1.8 GHz
Overclocked clock speed (Air) 3.75 GHz 1.8 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
Typical power consumption 65W 69.06W

bus

Architecture QPI HyperTransport 3.0
Clock speed 2,930 MHz 3,200 MHz
Intel Xeon E5620
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AMD Opteron 6124 HE
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