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Differences What are the advantages of each

Front view of Intel Pentium 4 640

Reasons to consider the
Intel Pentium 4 640

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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 higher clock speed 3.2 GHz vs 2.3 GHz Around 40% higher clock speed
Much better overclocked clock speed (Air) 3.92 GHz vs 2.75 GHz Around 45% better overclocked clock speed (Air)
Much more l2 cache per core 2 MB/core vs 0.5 MB/core 4x more l2 cache per core
Front view of AMD Athlon 64 X2 4400+

Reasons to consider the
AMD Athlon 64 X2 4400+

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More cores 2 vs 1 Twice as many cores; run more applications at once
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Significantly lower typical power consumption 52.81W vs 68.25W Around 25% lower typical power consumption
Significantly lower annual home energy cost 15.66 $/year vs 20.24 $/year Around 25% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 73.58 $/year Around 25% lower annual commercial energy cost

Features Key features of the Pentium 4 640  vs Athlon 64 X2 4400+ 

clock speed

L2 cache

overclocked clock speed (air)

Pentium 4 640
3.92 GHz

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Pentium 4 640  vs
Athlon 64 X2 4400+ 
Clock speed 3.2 GHz 2.3 GHz
Cores Single core Dual core
Socket type
LGA 775
AM2
939

features

Has a NX bit Yes Yes
Has virtualization support No Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
3DNow!
Supports dynamic frequency scaling Yes Yes

details

Pentium 4 640  vs
Athlon 64 X2 4400+ 
Threads 2 2
L2 cache 2 MB 1 MB
L2 cache per core 2 MB/core 0.5 MB/core
Manufacture process 90 nm 90 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.92 GHz 2.75 GHz
Overclocked clock speed (Water) 3.2 GHz 3.13 GHz
PassMark (Overclocked) 844.2 1,605.4
Overclocked clock speed (Air) 3.92 GHz 2.75 GHz

power consumption

TDP 84W 65W
Annual home energy cost 20.24 $/year 15.66 $/year
Annual commercial energy cost 73.58 $/year 56.94 $/year
Typical power consumption 68.25W 52.81W
Intel Pentium 4 640
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AMD Athlon 64 X2 4400+
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