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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 higher turbo clock speed 3.06 GHz vs 0 GHz Compared to all cpus, 3.06 GHz turbo clock speed is just OK
Much higher Maximum operating temperature 81.3 °C vs 55 °C Around 50% higher Maximum operating temperature
More threads 12 vs 8 4 more threads
Much better overclocked clock speed (Air) 3.84 GHz vs 3.13 GHz Around 25% better overclocked clock speed (Air)
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)
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Lower typical power consumption 77.19W vs 93.44W More than 15% lower typical power consumption
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Lower annual commercial energy cost 83.22 $/year vs 100.74 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 22.89 $/year vs 27.7 $/year More than 15% lower annual home energy cost
Front view of AMD Opteron 6140

Reasons to consider the
AMD Opteron 6140

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Much more l2 cache 4 MB vs 2 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly more l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Newer Feb, 2011 vs Mar, 2010 Release date 11 months later

Features Key features of the Xeon X5650  vs Opteron 6140 

clock speed

Xeon X5650
2.66 GHz
Opteron 6140
2.6 GHz

turbo clock speed

Xeon X5650
3.06 GHz
Opteron 6140
0 GHz

L2 cache

L3 cache

Xeon X5650
12 MB
Opteron 6140
12 MB

overclocked clock speed (air)

Xeon X5650
3.84 GHz
Opteron 6140
3.13 GHz

overclocked clock speed (water)

Xeon X5650
4.64 GHz
Opteron 6140
2.6 GHz

Specifications Full list of technical specs

summary

Xeon X5650  vs
Opteron 6140 
Clock speed 2.66 GHz 2.6 GHz
Turbo clock speed 3.06 GHz 0 GHz
Cores Hexa core Octa 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
3DNow!
Supplemental SSE3
AES

power consumption

TDP 95W 115W
Annual home energy cost 22.89 $/year 27.7 $/year
Annual commercial energy cost 83.22 $/year 100.74 $/year
Typical power consumption 77.19W 93.44W

memory controller

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

details

Xeon X5650  vs
Opteron 6140 
Threads 12 8
L2 cache 2 MB 4 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 12 MB 12 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 4
Clock multiplier 20 13
Voltage range 0.75 - 1.35V 1 - UnknownV
Operating temperature Unknown - 81.3°C Unknown - 55°C

overclocking

Overclocked clock speed 3.84 GHz 3.13 GHz
Overclocked clock speed (Water) 4.64 GHz 2.6 GHz
Overclocked clock speed (Air) 3.84 GHz 3.13 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
Clock speed 3,200 MHz 3,200 MHz
Intel Xeon X5650
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AMD Opteron 6140
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