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Differences What are the advantages of each

Front view of AMD Phenom X4 9450e

Reasons to consider the
AMD Phenom X4 9450e

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Much more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 65 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better PassMark score 2,621 vs 1,145 More than 2.2x better PassMark score
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much better performance per watt 1.48 pt/W vs 0.89 pt/W More than 65% better performance per watt
Front view of AMD Athlon 64 X2 4400+

Reasons to consider the
AMD Athlon 64 X2 4400+

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Higher clock speed 2.3 GHz vs 2.1 GHz Around 10% higher clock speed
Significantly better overclocked clock speed (Air) 2.75 GHz vs 2.51 GHz Around 10% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.13 GHz vs 2.1 GHz Around 50% better overclocked clock speed (Water)

Benchmarks Real world tests of Phenom X4 9450e vs Athlon 64 X2 4400+

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom X4 9450e  vs
Athlon 64 X2 4400+ 
Clock speed 2.1 GHz 2.3 GHz
Cores Quad core Dual core
Socket type
AM2+
AM2
939

features

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

details

Phenom X4 9450e  vs
Athlon 64 X2 4400+ 
Threads 4 2
L2 cache 2 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 65 nm 90 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.51 GHz 2.75 GHz
Overclocked clock speed (Water) 2.1 GHz 3.13 GHz
Overclocked clock speed (Air) 2.51 GHz 2.75 GHz

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
Performance per watt 1.48 pt/W 0.89 pt/W
Typical power consumption 52.81W 52.81W
AMD Phenom X4 9450e
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AMD Athlon 64 X2 4400+
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