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Differences What are the advantages of each

Front view of Intel Xeon X5650

Reasons to consider the
Intel Xeon X5650

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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 higher Maximum operating temperature 81.3 °C vs 68 °C Around 20% higher Maximum operating temperature
Much better overclocked clock speed (Air) 3.84 GHz vs 2.6 GHz Around 50% better overclocked clock speed (Air)
More threads 12 vs 8 4 more threads
Higher clock speed 2.66 GHz vs 2.6 GHz Almost the same
Much better overclocked clock speed (Water) 4.64 GHz vs 2.6 GHz Around 80% better overclocked clock speed (Water)
Much more l3 cache per core 2 MB/core vs 1 MB/core 2x more l3 cache per core
Front view of AMD Opteron 4276 HE

Reasons to consider the
AMD Opteron 4276 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 turbo clock speed 3.6 GHz vs 3.06 GHz Around 20% 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
Significantly lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Newer Jun, 2012 vs Mar, 2010 Release date over 2 years later

Features Key features of the Xeon X5650  vs Opteron 4276 HE 

clock speed

Xeon X5650
2.66 GHz
Opteron 4276 HE
2.6 GHz

turbo clock speed

Xeon X5650
3.06 GHz
Opteron 4276 HE
3.6 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon X5650
3.84 GHz
Opteron 4276 HE
2.6 GHz

overclocked clock speed (water)

Xeon X5650
4.64 GHz
Opteron 4276 HE
2.6 GHz

Specifications Full list of technical specs

summary

Xeon X5650  vs
Opteron 4276 HE 
Clock speed 2.66 GHz 2.6 GHz
Turbo clock speed 3.06 GHz 3.6 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 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Typical power consumption 77.19W 52.81W

memory controller

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

details

Xeon X5650  vs
Opteron 4276 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 20 13
Operating temperature Unknown - 81.3°C Unknown - 68°C

overclocking

Overclocked clock speed 3.84 GHz 2.6 GHz
Overclocked clock speed (Water) 4.64 GHz 2.6 GHz
Overclocked clock speed (Air) 3.84 GHz 2.6 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 6,400 MT/s 6,400 MT/s
Clock speed 3,200 MHz 3,200 MHz
Intel Xeon X5650
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AMD Opteron 4276 HE
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