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Differences What are the advantages of each

Front view of Intel Xeon E5-4650

Reasons to consider the
Intel Xeon E5-4650

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Much higher clock speed 2.7 GHz vs 1.8 GHz More than 50% higher clock speed
More cores 8 vs 2 6 more cores; run more applications at once
More threads 16 vs 2 14 more threads
Much better PassMark score 11,960 vs 899 More than 13.2x better PassMark score
Much better PassMark (Single core) score 1,483 vs 554 Around 2.8x better PassMark (Single core) score
Much newer manufacturing process 32 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 2.94 GHz vs 2 GHz More than 45% better overclocked clock speed (Air)
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
Much better overclocked clock speed (Water) 2.7 GHz vs 1.8 GHz More than 50% better overclocked clock speed (Water)
Newer May, 2012 vs Aug, 2005 Release date over 6 years later
Front view of AMD Opteron 165 HE

Reasons to consider the
AMD Opteron 165 HE

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Much lower typical power consumption 44.69W vs 105.63W 2.4x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Much lower annual commercial energy cost 48.18 $/year vs 113.88 $/year 2.4x lower annual commercial energy cost
Much lower annual home energy cost 13.25 $/year vs 31.32 $/year 2.4x lower annual home energy cost

Benchmarks Real world tests of Xeon E5-4650 vs Opteron 165 HE

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E5-4650  vs
Opteron 165 HE 
Clock speed 2.7 GHz 1.8 GHz
Cores Octa core Dual core
Socket type
LGA 2011
939
940

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
AVX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Xeon E5-4650  vs
Opteron 165 HE 
Threads 16 2
L2 cache 2 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 4 1

overclocking

Overclocked clock speed 2.94 GHz 2 GHz
Overclocked clock speed (Water) 2.7 GHz 1.8 GHz
Overclocked clock speed (Air) 2.94 GHz 2 GHz

power consumption

TDP 130W 55W
Annual home energy cost 31.32 $/year 13.25 $/year
Annual commercial energy cost 113.88 $/year 48.18 $/year
Performance per watt 2.52 pt/W 1 pt/W
Typical power consumption 105.63W 44.69W
Intel Xeon E5-4650
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AMD Opteron 165 HE
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