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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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Much more l2 cache 4 MB vs 2 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Higher clock speed 2.66 GHz vs 2.2 GHz More than 20% higher clock speed
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Significantly better overclocked clock speed (Air) 3.48 GHz vs 2.2 GHz Around 60% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.91 GHz vs 2.2 GHz Around 80% better overclocked clock speed (Water)
Front view of AMD Phenom II XLT Q54L

Reasons to consider the
AMD Phenom II XLT Q54L

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Much lower typical power consumption 52.81W vs 135.97W 2.6x lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 51.39 $/year 3.3x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 130.79 $/year 2.3x lower annual commercial energy cost
Newer Apr, 2010 vs Apr, 2009 Release date over a year later

Features Key features of the Core2 Quad Q8400  vs Phenom II XLT Q54L 

clock speed

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Core2 Quad Q8400  vs
Phenom II XLT Q54L 
Clock speed 2.66 GHz 2.2 GHz
Cores Quad core Quad core
Socket type
LGA 775
AM3

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
SSE4.1
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

bus

Clock speed 1,333 MHz 1,800 MHz

details

Core2 Quad Q8400  vs
Phenom II XLT Q54L 
Threads 4 4
L2 cache 4 MB 2 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.48 GHz 2.2 GHz
Overclocked clock speed (Water) 3.91 GHz 2.2 GHz
Overclocked clock speed (Air) 3.48 GHz 2.2 GHz

power consumption

TDP 95W 65W
Annual home energy cost 51.39 $/year 15.66 $/year
Annual commercial energy cost 130.79 $/year 56.94 $/year
Typical power consumption 135.97W 52.81W
Intel Core2 Quad Q8400
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AMD Phenom II XLT Q54L
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