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Differences What are the advantages of each

Front view of Intel Core2 Duo E7400

Reasons to consider the
Intel Core2 Duo E7400

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Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly higher clock speed 2.8 GHz vs 1.6 GHz Around 75% higher clock speed
Significantly more l2 cache 3 MB vs 2 MB 50% more l2 cache; more data can be stored in the l2 cache for quick access later
Much better overclocked clock speed (Air) 3.91 GHz vs 1.8 GHz Around 2.2x better overclocked clock speed (Air)
Much more l2 cache per core 1.5 MB/core vs 1 MB/core 50% more l2 cache per core
Much better overclocked clock speed (Water) 4.58 GHz vs 1.8 GHz More than 2.5x better overclocked clock speed (Water)
Newer Jan, 2008 vs Aug, 2005 Release date over 2 years later
Front view of AMD Opteron 860 HE

Reasons to consider the
AMD Opteron 860 HE

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
Lower typical power consumption 44.69W vs 52.81W More than 15% lower typical power consumption
Lower annual home energy cost 13.25 $/year vs 15.66 $/year More than 15% lower annual home energy cost
Lower annual commercial energy cost 48.18 $/year vs 56.94 $/year More than 15% lower annual commercial energy cost

Features Key features of the Core2 Duo E7400  vs Opteron 860 HE 

clock speed

L2 cache

overclocked clock speed (air)

Core2 Duo E7400
3.91 GHz
Opteron 860 HE
1.8 GHz

overclocked clock speed (water)

Core2 Duo E7400
4.58 GHz
Opteron 860 HE
1.8 GHz

Specifications Full list of technical specs

summary

Core2 Duo E7400  vs
Opteron 860 HE 
Clock speed 2.8 GHz 1.6 GHz
Cores Dual core Dual core
Socket type
LGA 775
940

features

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

details

Core2 Duo E7400  vs
Opteron 860 HE 
Threads 2 2
L2 cache 3 MB 2 MB
L2 cache per core 1.5 MB/core 1 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 1 8
Clock multiplier 10 8
Voltage range 0.85 - 1.36V 1.1 - UnknownV
Operating temperature Unknown - 74.1°C 0 - 71°C

overclocking

Overclocked clock speed 3.91 GHz 1.8 GHz
Overclocked clock speed (Water) 4.58 GHz 1.8 GHz
Overclocked clock speed (Air) 3.91 GHz 1.8 GHz

power consumption

TDP 65W 55W
Annual home energy cost 15.66 $/year 13.25 $/year
Annual commercial energy cost 56.94 $/year 48.18 $/year
Typical power consumption 52.81W 44.69W
Intel Core2 Duo E7400
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AMD Opteron 860 HE
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