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Differences What are the advantages of each

Front view of Intel Xeon E5645

Reasons to consider the
Intel Xeon E5645

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Much lower typical power consumption 65W vs 113.75W Around 45% lower typical power consumption
Much more l3 cache per core 2 MB/core vs 1 MB/core 2x more l3 cache per core
Much lower annual commercial energy cost 70.08 $/year vs 122.64 $/year Around 45% lower annual commercial energy cost
Much lower annual home energy cost 19.27 $/year vs 33.73 $/year Around 45% lower annual home energy cost
Front view of AMD Opteron 6286 SE

Reasons to consider the
AMD Opteron 6286 SE

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Much more l2 cache 16 MB vs 2 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 2.8 GHz vs 2.4 GHz More than 15% higher clock speed
Much more l3 cache 16 MB vs 12 MB Around 35% more l3 cache; more data can be stored in the l3 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
More threads 16 vs 12 4 more threads
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration

Features Key features of the Xeon E5645  vs Opteron 6286 SE 

clock speed

Xeon E5645
2.4 GHz
Opteron 6286 SE
2.8 GHz

L2 cache

L3 cache

Specifications Full list of technical specs

summary

Xeon E5645  vs
Opteron 6286 SE 
Clock speed 2.4 GHz 2.8 GHz
Cores Hexa core 16 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
Supplemental SSE3
AES

details

Xeon E5645  vs
Opteron 6286 SE 
Threads 12 16
L2 cache 2 MB 16 MB
L2 cache per core 0.33 MB/core 1 MB/core
L3 cache 12 MB 16 MB
L3 cache per core 2 MB/core 1 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 4

power consumption

TDP 80W 140W
Annual home energy cost 19.27 $/year 33.73 $/year
Annual commercial energy cost 70.08 $/year 122.64 $/year
Typical power consumption 65W 113.75W

bus

Architecture QPI HyperTransport 3.0
Transfer rate 5,860 MT/s 6,400 MT/s
Clock speed 2,930 MHz 3,200 MHz
Intel Xeon E5645
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AMD Opteron 6286 SE
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