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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 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
Much better overclocked clock speed (Air) 3.39 GHz vs 2.6 GHz More than 30% better overclocked clock speed (Air)
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
Front view of AMD Opteron 43GK HE

Reasons to consider the
AMD Opteron 43GK HE

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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
Significantly higher clock speed 2.6 GHz vs 2.4 GHz Around 10% higher clock speed
Higher turbo clock speed 2.9 GHz vs 2.67 GHz Around 10% higher turbo clock speed
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 52.81W vs 65W Around 20% lower typical power consumption
Significantly better overclocked clock speed (Water) 2.6 GHz vs 2.4 GHz Around 10% better overclocked clock speed (Water)
Lower annual commercial energy cost 56.94 $/year vs 70.08 $/year Around 20% lower annual commercial energy cost
Lower annual home energy cost 15.66 $/year vs 19.27 $/year Around 20% lower annual home energy cost

Features Key features of the Xeon E5645  vs Opteron 43GK HE 

clock speed

Xeon E5645
2.4 GHz
Opteron 43GK HE
2.6 GHz

turbo clock speed

Xeon E5645
2.67 GHz
Opteron 43GK HE
2.9 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon E5645
3.39 GHz
Opteron 43GK HE
2.6 GHz

overclocked clock speed (water)

Xeon E5645
2.4 GHz
Opteron 43GK HE
2.6 GHz

Specifications Full list of technical specs

summary

Xeon E5645  vs
Opteron 43GK HE 
Clock speed 2.4 GHz 2.6 GHz
Turbo clock speed 2.67 GHz 2.9 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
AVX 1.1
SSE2
F16C
MMX
SSE4
XOP
AVX
SSE3
SSE
CLMUL
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
CVT16
AMD-V
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

memory controller

Memory controller Built-in Built-in
Channels Triple Channel Dual Channel
Supports ECC Yes Yes

details

Xeon E5645  vs
Opteron 43GK HE 
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 18 13

overclocking

Overclocked clock speed 3.39 GHz 2.6 GHz
Overclocked clock speed (Water) 2.4 GHz 2.6 GHz
Overclocked clock speed (Air) 3.39 GHz 2.6 GHz

power consumption

TDP 80W 65W
Annual home energy cost 19.27 $/year 15.66 $/year
Annual commercial energy cost 70.08 $/year 56.94 $/year
Typical power consumption 65W 52.81W

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 43GK HE
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