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Differences What are the advantages of each

Front view of Intel Core2 Quad Q8400

Reasons to consider the
Intel Core2 Quad Q8400

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Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Front view of Intel Celeron D 340J

Reasons to consider the
Intel Celeron D 340J

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CPUBoss is not aware of any important advantages of the Celeron D 340J vs the Core2 Quad Q8400.

Features Key features of the Core2 Quad Q8400  vs Celeron D 340J 

clock speed

Core2 Quad Q8400
2.66 GHz
Celeron D 340J
2.93 GHz

L2 cache

overclocked clock speed (air)

Core2 Quad Q8400
3.48 GHz
Celeron D 340J
3.41 GHz

overclocked clock speed (water)

Core2 Quad Q8400
3.91 GHz
Celeron D 340J
2.93 GHz

Specifications Full list of technical specs

summary

Core2 Quad Q8400  vs
Celeron D 340J 
Clock speed 2.66 GHz 2.93 GHz
Cores Quad core Single core
Socket type
LGA 775
478

features

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

power consumption

TDP 95W 84W
Annual home energy cost 51.39 $/year 20.24 $/year
Annual commercial energy cost 130.79 $/year 73.58 $/year
Typical power consumption 135.97W 68.25W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 1,333 MHz 533 MHz

details

Core2 Quad Q8400  vs
Celeron D 340J 
Architecture x86-64 x86
Threads 4 1
L2 cache 4 MB 0.25 MB
L2 cache per core 1 MB/core 0.25 MB/core
Manufacture process 45 nm 90 nm
Transistor count 456,000,000 125,000,000
Max CPUs 1 1
Clock multiplier 8 22
Voltage range 0.85 - 1.36V 1.25 - 1.4V
Operating temperature Unknown - 71.4°C Unknown - 67.7°C

overclocking

Overclocked clock speed 3.48 GHz 3.41 GHz
Overclocked clock speed (Water) 3.91 GHz 2.93 GHz
Overclocked clock speed (Air) 3.48 GHz 3.41 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 Q8400
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Intel Celeron D 340J
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