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Differences What are the advantages of each

Front view of Intel Core2 QX9775

Reasons to consider the
Intel Core2 QX9775

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Much more l2 cache 12 MB vs 3 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly higher clock speed 3.2 GHz vs 2.2 GHz More than 45% higher clock speed
Much more l2 cache per core 3 MB/core vs 0.5 MB/core 6x more l2 cache per core
Much better overclocked clock speed (Air) 4.04 GHz vs 2.2 GHz Around 85% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.45 GHz vs 2.2 GHz More than 2x better overclocked clock speed (Water)
Front view of AMD Opteron 41KX HE

Reasons to consider the
AMD Opteron 41KX HE

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Much lower typical power consumption 52.81W vs 121.88W 2.3x lower typical power consumption
More cores 6 vs 4 2 more cores; run more applications at once
Much lower annual home energy cost 15.66 $/year vs 36.13 $/year 2.3x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 131.4 $/year 2.3x lower annual commercial energy cost
Newer Jun, 2010 vs Feb, 2008 Release date over 2 years later
More threads 6 vs 4 2 more threads

Features Key features of the Core2 QX9775  vs Opteron 41KX HE 

clock speed

Core2 QX9775
3.2 GHz
Opteron 41KX HE
2.2 GHz

L2 cache

overclocked clock speed (air)

Core2 QX9775
4.04 GHz
Opteron 41KX HE
2.2 GHz

overclocked clock speed (water)

Core2 QX9775
4.45 GHz
Opteron 41KX HE
2.2 GHz

Specifications Full list of technical specs

summary

Core2 QX9775  vs
Opteron 41KX HE 
Clock speed 3.2 GHz 2.2 GHz
Cores Quad core Hexa core
Socket type
LGA 771
C32

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
SSE4.1
3DNow!
Supplemental SSE3

bus

Architecture FSB HyperTransport 3.0
Clock speed 1,600 MHz 2,200 MHz

details

Core2 QX9775  vs
Opteron 41KX HE 
Threads 4 6
L2 cache 12 MB 3 MB
L2 cache per core 3 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 2 2
Clock multiplier 8 11
Voltage range 0.85 - 1.35V 1.19 - UnknownV

overclocking

Overclocked clock speed 4.04 GHz 2.2 GHz
Overclocked clock speed (Water) 4.45 GHz 2.2 GHz
Overclocked clock speed (Air) 4.04 GHz 2.2 GHz

power consumption

TDP 150W 65W
Annual home energy cost 36.13 $/year 15.66 $/year
Annual commercial energy cost 131.4 $/year 56.94 $/year
Typical power consumption 121.88W 52.81W
Intel Core2 QX9775
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AMD Opteron 41KX HE
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