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Differences What are the advantages of each

Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much more l2 cache 6 MB vs 1 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 45 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3 GHz vs 1.4 GHz Around 2.2x higher clock speed
Much more l2 cache per core 3 MB/core vs 1 MB/core 3x more l2 cache per core
Much better overclocked clock speed (Air) 4.22 GHz vs 1.69 GHz More than 2.5x better overclocked clock speed (Air)
Lower typical power consumption 52.81W vs 66.71W More than 20% lower typical power consumption
Newer Jan, 2008 vs Jun, 2003 Release date over 4 years later
Much better overclocked clock speed (Water) 4.23 GHz vs 1.4 GHz More than 3x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once
Lower annual commercial energy cost 56.94 $/year vs 71.92 $/year More than 20% lower annual commercial energy cost
Lower annual home energy cost 15.66 $/year vs 19.78 $/year More than 20% lower annual home energy cost
Front view of AMD Opteron 840

Reasons to consider the
AMD Opteron 840

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration

Features Key features of the Core2 Duo E8400  vs Opteron 840 

clock speed

L2 cache

overclocked clock speed (air)

Core2 Duo E8400
4.22 GHz
Opteron 840
1.69 GHz

overclocked clock speed (water)

Core2 Duo E8400
4.23 GHz
Opteron 840
1.4 GHz

Specifications Full list of technical specs

summary

Core2 Duo E8400  vs
Opteron 840 
Clock speed 3 GHz 1.4 GHz
Cores Dual core Single 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

details

Core2 Duo E8400  vs
Opteron 840 
Threads 2 1
L2 cache 6 MB 1 MB
L2 cache per core 3 MB/core 1 MB/core
Manufacture process 45 nm 130 nm
Max CPUs 1 8
Clock multiplier 9 7
Voltage range 0.85 - 1.36V 1.5 - UnknownV

overclocking

Overclocked clock speed 4.22 GHz 1.69 GHz
Overclocked clock speed (Water) 4.23 GHz 1.4 GHz
Overclocked clock speed (Air) 4.22 GHz 1.69 GHz

power consumption

TDP 65W 82.1W
Annual home energy cost 15.66 $/year 19.78 $/year
Annual commercial energy cost 56.94 $/year 71.92 $/year
Typical power consumption 52.81W 66.71W
Intel Core2 Duo E8400
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AMD Opteron 840
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