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Differences What are the advantages of each

Front view of Intel Core2 Quad Q9400

Reasons to consider the
Intel Core2 Quad Q9400

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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 more l2 cache per core 1.5 MB/core vs 0.25 MB/core 6x more l2 cache per core
Significantly better overclocked clock speed (Air) 3.54 GHz vs 2.7 GHz More than 30% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.15 GHz vs 2.7 GHz Around 55% better overclocked clock speed (Water)
Front view of Intel Core i7 4700EC

Reasons to consider the
Intel Core i7 4700EC

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Much newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 34.94W vs 77.19W 2.2x lower typical power consumption
Newer Feb, 2014 vs Jul, 2008 Release date over 5 years later
More threads 8 vs 4 Twice as many threads
Much lower annual home energy cost 10.36 $/year vs 22.89 $/year 2.2x lower annual home energy cost
Much lower annual commercial energy cost 37.67 $/year vs 83.22 $/year 2.2x lower annual commercial energy cost

Features Key features of the Core2 Quad Q9400  vs Core i7 4700EC 

clock speed

Core2 Quad Q9400
2.66 GHz
Core i7 4700EC
2.7 GHz

L2 cache

overclocked clock speed (air)

Core2 Quad Q9400
3.54 GHz
Core i7 4700EC
2.7 GHz

overclocked clock speed (water)

Core2 Quad Q9400
4.15 GHz
Core i7 4700EC
2.7 GHz

Specifications Full list of technical specs

summary

Core2 Quad Q9400  vs
Core i7 4700EC 
Clock speed 2.66 GHz 2.7 GHz
Cores Quad core Quad core
Socket type
LGA 775
BGA 1364

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 43W
Annual home energy cost 22.89 $/year 10.36 $/year
Annual commercial energy cost 83.22 $/year 37.67 $/year
Typical power consumption 77.19W 34.94W

details

Core2 Quad Q9400  vs
Core i7 4700EC 
Architecture x86-64 x86-64
Threads 4 8
L2 cache 6 MB 1 MB
L2 cache per core 1.5 MB/core 0.25 MB/core
Manufacture process 45 nm 22 nm
Max CPUs 1 1
Clock multiplier 8 27

overclocking

Overclocked clock speed 3.54 GHz 2.7 GHz
Overclocked clock speed (Water) 4.15 GHz 2.7 GHz
Overclocked clock speed (Air) 3.54 GHz 2.7 GHz

integrated graphics

GPU None GPU
Number of displays supported N/A 3

bus

Architecture FSB DMI
Number of links 1 1
Intel Core2 Quad Q9400
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Intel Core i7 4700EC
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