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Differences What are the advantages of each

Front view of Intel Core2 Quad Q9400S

Reasons to consider the
Intel Core2 Quad Q9400S

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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 lower typical power consumption 52.81W vs 73.94W Around 30% lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Higher Maximum operating temperature 76.3 °C vs 64 °C Around 20% higher Maximum operating temperature
Significantly lower annual home energy cost 15.66 $/year vs 21.92 $/year Around 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 79.72 $/year Around 30% lower annual commercial energy cost
Front view of Intel Core i7 6700K

Reasons to consider the
Intel Core i7 6700K

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Much higher clock speed 4 GHz vs 2.66 GHz More than 50% higher clock speed
Much newer manufacturing process 14 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 better overclocked clock speed (Air) 4.61 GHz vs 2.67 GHz Around 75% better overclocked clock speed (Air)
Newer Jul, 2015 vs Jan, 2009 Release date over 6 years later
More threads 8 vs 4 Twice as many threads
Much better overclocked clock speed (Water) 4.77 GHz vs 2.67 GHz Around 80% better overclocked clock speed (Water)

Features Key features of the Core2 Quad Q9400S  vs Core i7 6700K 

clock speed

L2 cache

overclocked clock speed (air)

Core i7 6700K
4.61 GHz

overclocked clock speed (water)

Core i7 6700K
4.77 GHz

Specifications Full list of technical specs

summary

Core2 Quad Q9400S  vs
Core i7 6700K 
Clock speed 2.66 GHz 4 GHz
Cores Quad core Quad core

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
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 65W 91W
Annual home energy cost 15.66 $/year 21.92 $/year
Annual commercial energy cost 56.94 $/year 79.72 $/year
Typical power consumption 52.81W 73.94W

details

Core2 Quad Q9400S  vs
Core i7 6700K 
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 14 nm
Max CPUs 1 1
Operating temperature Unknown - 76.3°C Unknown - 64°C

overclocking

Overclocked clock speed 2.67 GHz 4.61 GHz
Overclocked clock speed (Water) 2.67 GHz 4.77 GHz
Overclocked clock speed (Air) 2.67 GHz 4.61 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 530
Number of displays supported N/A 3
GPU clock speed N/A 350 MHz
Turbo clock speed N/A 1,150 MHz

bus

Architecture FSB FSB
Number of links 1 0
Intel Core2 Quad Q9400S
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Intel Core i7 6700K
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