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Differences What are the advantages of each

Front view of Intel Core2 Quad Q6400

Reasons to consider the
Intel Core2 Quad Q6400

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More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much higher clock speed 3 GHz vs 2.13 GHz More than 40% 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 better overclocked clock speed (Air) 4.22 GHz vs 2.72 GHz More than 55% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.23 GHz vs 2.13 GHz Around 2x better overclocked clock speed (Water)
Newer Jan, 2008 vs Jan, 2007 Release date a year later

Features Key features of the Core2 Quad Q6400  vs Duo E8400 

clock speed

L2 cache

overclocked clock speed (air)

Core2 Quad Q6400
2.72 GHz
Core2 Duo E8400
4.22 GHz

overclocked clock speed (water)

Core2 Quad Q6400
2.13 GHz
Core2 Duo E8400
4.23 GHz

Specifications Full list of technical specs

summary

Core2 Quad Q6400  vs
Duo E8400 
Clock speed 2.13 GHz 3 GHz
Cores Quad core Dual core
Socket type
LGA 775

features

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

bus

Clock speed 1,066 MHz 1,333 MHz

details

Core2 Quad Q6400  vs
Duo E8400 
Threads 4 2
L2 cache 8 MB 6 MB
L2 cache per core 2 MB/core 3 MB/core
Manufacture process 65 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.72 GHz 4.22 GHz
Overclocked clock speed (Water) 2.13 GHz 4.23 GHz
Overclocked clock speed (Air) 2.72 GHz 4.22 GHz

power consumption

Typical power consumption N/A 52.81W
Intel Core2 Quad Q6400
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Intel Core2 Duo E8400
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