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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 clock speed 2.66 GHz vs 1.8 GHz Around 50% higher clock speed
More cores 6 vs 2 Three times as many cores; run more applications at once
More threads 12 vs 2 10 more threads
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) 3.84 GHz vs 2.19 GHz More than 75% better overclocked clock speed (Air)
Much higher Maximum operating temperature 81.3 °C vs 67 °C More than 20% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.64 GHz vs 1.8 GHz More than 2.5x better overclocked clock speed (Water)
Newer Mar, 2010 vs Jan, 2005 Release date over 5 years later
Front view of AMD Opteron 265

Reasons to consider the
AMD Opteron 265

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Much more l2 cache per core 1 MB/core vs 0.33 MB/core More than 3x more l2 cache per core

Features Key features of the Xeon X5650  vs Opteron 265 

clock speed

Xeon X5650
2.66 GHz
Opteron 265
1.8 GHz

L2 cache

overclocked clock speed (air)

Xeon X5650
3.84 GHz
Opteron 265
2.19 GHz

overclocked clock speed (water)

Xeon X5650
4.64 GHz
Opteron 265
1.8 GHz

TDP

Specifications Full list of technical specs

summary

Xeon X5650  vs
Opteron 265 
Clock speed 2.66 GHz 1.8 GHz
Cores Hexa core Dual core
Socket type
LGA 1366
940

features

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

details

Xeon X5650  vs
Opteron 265 
Threads 12 2
L2 cache 2 MB 2 MB
L2 cache per core 0.33 MB/core 1 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 2 2
Clock multiplier 20 9
Voltage range 0.75 - 1.35V 1 - UnknownV
Operating temperature Unknown - 81.3°C 0 - 67°C

overclocking

Overclocked clock speed 3.84 GHz 2.19 GHz
Overclocked clock speed (Water) 4.64 GHz 1.8 GHz
Overclocked clock speed (Air) 3.84 GHz 2.19 GHz

power consumption

TDP 95W 95W
Annual home energy cost 22.89 $/year 22.89 $/year
Annual commercial energy cost 83.22 $/year 83.22 $/year
Typical power consumption 77.19W 77.19W
Intel Xeon X5650
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AMD Opteron 265
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