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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 0.5 MB 12x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly higher clock speed 3 GHz vs 2 GHz 50% higher clock speed
Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
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) 4.22 GHz vs 2 GHz More than 2x better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.23 GHz vs 2 GHz More than 2x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once
Front view of AMD Sempron 3700+

Reasons to consider the
AMD Sempron 3700+

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Much lower typical power consumption 20.31W vs 52.81W 2.6x lower typical power consumption
Significantly higher Maximum operating temperature 95 °C vs 72.4 °C More than 30% higher Maximum operating temperature
Much lower annual home energy cost 6.02 $/year vs 15.66 $/year 2.6x lower annual home energy cost
Much lower annual commercial energy cost 21.9 $/year vs 56.94 $/year 2.6x lower annual commercial energy cost

Features Key features of the Core2 Duo E8400  vs Sempron 3700+ 

clock speed

L2 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Core2 Duo E8400  vs
Sempron 3700+ 
Clock speed 3 GHz 2 GHz
Cores Dual core Single core

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 E8400  vs
Sempron 3700+ 
Threads 2 1
L2 cache 6 MB 0.5 MB
L2 cache per core 3 MB/core 0.5 MB/core
Manufacture process 45 nm 65 nm
Max CPUs 1 1
Operating temperature Unknown - 72.4°C Unknown - 95°C

overclocking

Overclocked clock speed 4.22 GHz 2 GHz
Overclocked clock speed (Water) 4.23 GHz 2 GHz
Overclocked clock speed (Air) 4.22 GHz 2 GHz

power consumption

TDP 65W 25W
Annual home energy cost 15.66 $/year 6.02 $/year
Annual commercial energy cost 56.94 $/year 21.9 $/year
Typical power consumption 52.81W 20.31W
Intel Core2 Duo E8400
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AMD Sempron 3700+
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