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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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Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Front view of Intel Core2 Quad Q8400S

Reasons to consider the
Intel Core2 Quad Q8400S

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Newer Apr, 2009 vs Jan, 2009 Release date 3 months later

Features Key features of the Core2 Quad Q9400S  vs Q8400S 

clock speed

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Core2 Quad Q9400S  vs
Q8400S 
Clock speed 2.66 GHz 2.66 GHz
Cores Quad core Quad core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 65W
Annual home energy cost 15.66 $/year 15.66 $/year
Annual commercial energy cost 56.94 $/year 56.94 $/year
Typical power consumption 52.81W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 1,333 MHz 1,333 MHz

details

Core2 Quad Q9400S  vs
Q8400S 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 6 MB 4 MB
L2 cache per core 1.5 MB/core 1 MB/core
Manufacture process 45 nm 45 nm
Transistor count 456,000,000 456,000,000
Max CPUs 1 1
Clock multiplier 8 8
Voltage range 0.85 - 1.36V 0.85 - 1.36V
Operating temperature Unknown - 76.3°C Unknown - 76.3°C

overclocking

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

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
Intel Core2 Quad Q9400S
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Intel Core2 Quad Q8400S
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