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Differences What are the advantages of each

Front view of AMD Athlon II XLT V66C

Reasons to consider the
AMD Athlon II XLT V66C

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Much lower typical power consumption 36.56W vs 77.19W 2.1x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much lower annual home energy cost 10.84 $/year vs 22.89 $/year 2.1x lower annual home energy cost
Much lower annual commercial energy cost 39.42 $/year vs 83.22 $/year 2.1x lower annual commercial energy cost
Better overclocked clock speed (Air) 3.83 GHz vs 3.57 GHz More than 5% better overclocked clock speed (Air)
Front view of AMD Athlon II X4 640

Reasons to consider the
AMD Athlon II X4 640

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Higher clock speed 3 GHz vs 2.8 GHz More than 5% higher clock speed
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Significantly better overclocked clock speed (Water) 3.89 GHz vs 2.8 GHz Around 40% better overclocked clock speed (Water)

Features Key features of the Athlon II XLT V66C  vs X4 640 

clock speed

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Athlon II XLT V66C  vs
X4 640 
Clock speed 2.8 GHz 3 GHz
Cores Dual core Quad core
Socket type
AM3

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

bus

Clock speed 2,000 MHz 2,000 MHz

details

Athlon II XLT V66C  vs
X4 640 
Threads 2 4
L2 cache 2 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 3.83 GHz 3.57 GHz
Overclocked clock speed (Water) 2.8 GHz 3.89 GHz
Overclocked clock speed (Air) 3.83 GHz 3.57 GHz

power consumption

TDP 45W 95W
Annual home energy cost 10.84 $/year 22.89 $/year
Annual commercial energy cost 39.42 $/year 83.22 $/year
Typical power consumption 36.56W 77.19W
AMD Athlon II XLT V66C
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AMD Athlon II X4 640
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