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Differences What are the advantages of each

Front view of Intel Xeon L5639

Reasons to consider the
Intel Xeon L5639

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Much higher clock speed 2.13 GHz vs 1.8 GHz Around 20% higher clock speed
Much more l3 cache 12 MB vs 6 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
Much better overclocked clock speed (Air) 3.46 GHz vs 1.8 GHz More than 90% better overclocked clock speed (Air)
More threads 12 vs 6 Twice as many threads
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) 2.13 GHz vs 1.8 GHz Around 20% better overclocked clock speed (Water)
Front view of AMD Opteron 4164 EE

Reasons to consider the
AMD Opteron 4164 EE

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Much more l2 cache 3 MB vs 2 MB 50% more l2 cache; more data can be stored in the l2 cache for quick access later
Lower typical power consumption 28.44W vs 48.75W More than 40% lower typical power consumption
Significantly more l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core
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

Features Key features of the Xeon L5639  vs Opteron 4164 EE 

clock speed

Xeon L5639
2.13 GHz
Opteron 4164 EE
1.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon L5639
3.46 GHz
Opteron 4164 EE
1.8 GHz

overclocked clock speed (water)

Xeon L5639
2.13 GHz
Opteron 4164 EE
1.8 GHz

Specifications Full list of technical specs

summary

Xeon L5639  vs
Opteron 4164 EE 
Clock speed 2.13 GHz 1.8 GHz
Cores Hexa core Hexa core
Socket type
LGA 1366
C32

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
AES

bus

Architecture QPI HyperTransport 3.0
Clock speed 2,933 MHz 1,800 MHz

details

Xeon L5639  vs
Opteron 4164 EE 
Threads 12 6
L2 cache 2 MB 3 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 12 MB 6 MB
L3 cache per core 2 MB/core 1 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 2

overclocking

Overclocked clock speed 3.46 GHz 1.8 GHz
Overclocked clock speed (Water) 2.13 GHz 1.8 GHz
Overclocked clock speed (Air) 3.46 GHz 1.8 GHz

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
Intel Xeon L5639
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AMD Opteron 4164 EE
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