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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 lower typical power consumption 52.81W vs 105.63W 2x lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much higher Maximum operating temperature 76.3 °C vs 64.5 °C Around 20% higher Maximum operating temperature
Much lower annual commercial energy cost 56.94 $/year vs 113.88 $/year 2x lower annual commercial energy cost
Much lower annual home energy cost 15.66 $/year vs 31.32 $/year 2x lower annual home energy cost
Newer Jan, 2009 vs Nov, 2007 Release date over 1 years later
Front view of Intel Core2 QX9650

Reasons to consider the
Intel Core2 QX9650

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Higher clock speed 3 GHz vs 2.66 GHz Around 15% higher clock speed
Much better overclocked clock speed (Air) 4.2 GHz vs 2.67 GHz Around 60% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.28 GHz vs 2.67 GHz More than 60% better overclocked clock speed (Water)

Features Key features of the Core2 Quad Q9400S  vs QX9650 

clock speed

L2 cache

overclocked clock speed (air)

Core2 QX9650
4.2 GHz

overclocked clock speed (water)

Core2 QX9650
4.28 GHz

Specifications Full list of technical specs

summary

Core2 Quad Q9400S  vs
QX9650 
Clock speed 2.66 GHz 3 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 130W
Annual home energy cost 15.66 $/year 31.32 $/year
Annual commercial energy cost 56.94 $/year 113.88 $/year
Typical power consumption 52.81W 105.63W

bus

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

details

Core2 Quad Q9400S  vs
QX9650 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 6 MB 12 MB
L2 cache per core 1.5 MB/core 3 MB/core
Manufacture process 45 nm 45 nm
Transistor count 456,000,000 820,000,000
Max CPUs 1 1
Clock multiplier 8 9
Voltage range 0.85 - 1.36V 0.85 - 1.36V
Operating temperature Unknown - 76.3°C Unknown - 64.5°C

overclocking

Overclocked clock speed 2.67 GHz 4.2 GHz
Overclocked clock speed (Water) 2.67 GHz 4.28 GHz
Overclocked clock speed (Air) 2.67 GHz 4.2 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 QX9650
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