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Differences What are the advantages of each

Front view of Intel Xeon L5640

Reasons to consider the
Intel Xeon L5640

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Much higher turbo clock speed 2.8 GHz vs 0 GHz Compared to all cpus, 2.8 GHz turbo clock speed is just OK
Much higher clock speed 2.26 GHz vs 1.8 GHz More than 25% higher clock speed
Much better overclocked clock speed (Air) 3.9 GHz vs 1.8 GHz Around 2.2x better overclocked clock speed (Air)
Lower typical power consumption 48.75W vs 69.06W Around 30% lower typical power consumption
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l3 cache per core 2 MB/core vs 1 MB/core 2x more l3 cache per core
Much better overclocked clock speed (Water) 2.27 GHz vs 1.8 GHz More than 25% better overclocked clock speed (Water)
Lower annual commercial energy cost 52.56 $/year vs 74.46 $/year Around 30% lower annual commercial energy cost
Lower annual home energy cost 14.45 $/year vs 20.48 $/year Around 30% lower annual home energy cost
Front view of AMD Opteron 6166 HE

Reasons to consider the
AMD Opteron 6166 HE

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Much more l2 cache 6 MB vs 2 MB 3x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly more l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Newer Feb, 2011 vs Mar, 2010 Release date 11 months later

Features Key features of the Xeon L5640  vs Opteron 6166 HE 

clock speed

Xeon L5640
2.26 GHz
Opteron 6166 HE
1.8 GHz

turbo clock speed

Xeon L5640
2.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon L5640
3.9 GHz
Opteron 6166 HE
1.8 GHz

overclocked clock speed (water)

Xeon L5640
2.27 GHz
Opteron 6166 HE
1.8 GHz

Specifications Full list of technical specs

summary

Xeon L5640  vs
Opteron 6166 HE 
Clock speed 2.26 GHz 1.8 GHz
Turbo clock speed 2.8 GHz 0 GHz
Cores Hexa core Duodeca 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

power consumption

TDP 60W 85W
Annual home energy cost 14.45 $/year 20.48 $/year
Annual commercial energy cost 52.56 $/year 74.46 $/year
Typical power consumption 48.75W 69.06W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3

details

Xeon L5640  vs
Opteron 6166 HE 
Threads 12 12
L2 cache 2 MB 6 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 12 MB 12 MB
L3 cache per core 2 MB/core 1 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 4
Clock multiplier 17 9
Voltage range 0.75 - 1.35V 1.07 - UnknownV
Operating temperature Unknown - 69.4°C Unknown - 55°C

overclocking

Overclocked clock speed 3.9 GHz 1.8 GHz
Overclocked clock speed (Water) 2.27 GHz 1.8 GHz
Overclocked clock speed (Air) 3.9 GHz 1.8 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
Clock speed 2,930 MHz 3,200 MHz
Intel Xeon L5640
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AMD Opteron 6166 HE
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