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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 clock speed 2.26 GHz vs 1.6 GHz More than 40% higher clock speed
Much better overclocked clock speed (Air) 3.9 GHz vs 1.6 GHz Around 2.5x better overclocked clock speed (Air)
Much more l3 cache 12 MB vs 8 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 12 vs 8 4 more threads
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 1.6 GHz More than 40% better overclocked clock speed (Water)
Front view of AMD Opteron 4256 EE

Reasons to consider the
AMD Opteron 4256 EE

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Much more l2 cache 8 MB vs 2 MB 4x 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 0.33 MB/core More than 3x more l2 cache per core
Lower typical power consumption 28.44W vs 48.75W More than 40% lower typical power consumption
Lower annual commercial energy cost 30.66 $/year vs 52.56 $/year More than 40% lower annual commercial energy cost
Lower annual home energy cost 8.43 $/year vs 14.45 $/year More than 40% lower annual home energy cost
Newer Nov, 2011 vs Mar, 2010 Release date over 1 years later

Features Key features of the Xeon L5640  vs Opteron 4256 EE 

clock speed

Xeon L5640
2.26 GHz
Opteron 4256 EE
1.6 GHz

turbo clock speed

Xeon L5640
2.8 GHz
Opteron 4256 EE
2.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon L5640
3.9 GHz
Opteron 4256 EE
1.6 GHz

overclocked clock speed (water)

Xeon L5640
2.27 GHz
Opteron 4256 EE
1.6 GHz

Specifications Full list of technical specs

summary

Xeon L5640  vs
Opteron 4256 EE 
Clock speed 2.26 GHz 1.6 GHz
Turbo clock speed 2.8 GHz 2.8 GHz
Cores Hexa core Octa core
Socket type
LGA 1366
C32

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 60W 35W
Annual home energy cost 14.45 $/year 8.43 $/year
Annual commercial energy cost 52.56 $/year 30.66 $/year
Typical power consumption 48.75W 28.44W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800

details

Xeon L5640  vs
Opteron 4256 EE 
Threads 12 8
L2 cache 2 MB 8 MB
L2 cache per core 0.33 MB/core 1 MB/core
L3 cache 12 MB 8 MB
L3 cache per core 2 MB/core 1 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2
Clock multiplier 17 14
Operating temperature Unknown - 69.4°C Unknown - 64°C

overclocking

Overclocked clock speed 3.9 GHz 1.6 GHz
Overclocked clock speed (Water) 2.27 GHz 1.6 GHz
Overclocked clock speed (Air) 3.9 GHz 1.6 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 2
Transfer rate 5,860 MT/s 6,400 MT/s
Clock speed 2,930 MHz 3,200 MHz
Intel Xeon L5640
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AMD Opteron 4256 EE
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