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Differences What are the advantages of each

Front view of AMD Phenom II X4 965

Reasons to consider the
AMD Phenom II X4 965

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Higher clock speed 3.4 GHz vs 2.8 GHz More than 20% 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
Much better overclocked clock speed (Water) 4.22 GHz vs 2.8 GHz More than 50% better overclocked clock speed (Water)
Better overclocked clock speed (Air) 4.05 GHz vs 3.83 GHz More than 5% better overclocked clock speed (Air)
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 152.93W 4.2x 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 54.06 $/year 5x lower annual home energy cost
Much lower annual commercial energy cost 39.42 $/year vs 152.42 $/year 3.9x lower annual commercial energy cost
Newer Apr, 2010 vs Nov, 2009 Release date 5 months later

Features Key features of the Phenom II X4 965  vs Athlon II XLT V66C 

clock speed

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Phenom II X4 965  vs
Athlon II XLT V66C 
Clock speed 3.4 GHz 2.8 GHz
Cores Quad core Dual 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

Phenom II X4 965  vs
Athlon II XLT V66C 
Threads 4 2
L2 cache 2 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.05 GHz 3.83 GHz
Overclocked clock speed (Water) 4.22 GHz 2.8 GHz
Overclocked clock speed (Air) 4.05 GHz 3.83 GHz

power consumption

TDP 140W 45W
Annual home energy cost 54.06 $/year 10.84 $/year
Annual commercial energy cost 152.42 $/year 39.42 $/year
Typical power consumption 152.93W 36.56W
AMD Phenom II X4 965
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AMD Athlon II XLT V66C
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