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Differences What are the advantages of each

Front view of Intel Pentium E5400

Reasons to consider the
Intel Pentium E5400

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Much better overclocked clock speed (Air) 3.75 GHz vs 2.67 GHz More than 40% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.49 GHz vs 2.67 GHz Around 70% better overclocked clock speed (Water)
Front view of Intel Core2 Quad Q9400S

Reasons to consider the
Intel Core2 Quad Q9400S

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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
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Higher Maximum operating temperature 76.3 °C vs 74.1 °C Around 5% higher Maximum operating temperature

Features Key features of the Pentium E5400  vs Core2 Quad Q9400S 

clock speed

Pentium E5400
2.7 GHz

L2 cache

overclocked clock speed (air)

Pentium E5400
3.75 GHz

overclocked clock speed (water)

Pentium E5400
4.49 GHz

Specifications Full list of technical specs

summary

Pentium E5400  vs
Core2 Quad Q9400S 
Clock speed 2.7 GHz 2.66 GHz
Cores Dual core Quad core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
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 800 MHz 1,333 MHz

details

Pentium E5400  vs
Core2 Quad Q9400S 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 2 MB 6 MB
L2 cache per core 1 MB/core 1.5 MB/core
Manufacture process 45 nm 45 nm
Transistor count 228,000,000 456,000,000
Max CPUs 1 1
Clock multiplier 13 8
Voltage range 0.85 - 1.36V 0.85 - 1.36V
Operating temperature Unknown - 74.1°C Unknown - 76.3°C

overclocking

Overclocked clock speed 3.75 GHz 2.67 GHz
Overclocked clock speed (Water) 4.49 GHz 2.67 GHz
Overclocked clock speed (Air) 3.75 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 Pentium E5400
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Intel Core2 Quad Q9400S
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