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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 81.25W 2.2x lower typical power consumption
Much lower annual home energy cost 10.84 $/year vs 24.09 $/year 2.2x lower annual home energy cost
Much lower annual commercial energy cost 39.42 $/year vs 87.6 $/year 2.2x lower annual commercial energy cost
Front view of AMD A10 5800K

Reasons to consider the
AMD A10 5800K

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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
Significantly higher clock speed 3.8 GHz vs 2.8 GHz More than 35% higher clock speed
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 4 vs 2 Twice as many cores; run more applications at once
Better overclocked clock speed (Air) 4.48 GHz vs 3.83 GHz More than 15% better overclocked clock speed (Air)
Newer Oct, 2012 vs Apr, 2010 Release date over 2 years later
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Water) 4.59 GHz vs 2.8 GHz Around 65% better overclocked clock speed (Water)

Features Key features of the Athlon II XLT V66C  vs A10 5800K 

clock speed

A10 5800K
3.8 GHz

L2 cache

overclocked clock speed (air)

A10 5800K
4.48 GHz

overclocked clock speed (water)

A10 5800K
4.59 GHz

Specifications Full list of technical specs

summary

Athlon II XLT V66C  vs
A10 5800K 
Clock speed 2.8 GHz 3.8 GHz
Cores Dual core Quad core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
AVX 1.1
SSE2
F16C
MMX
XOP
SSE3
SSE
CLMUL
AMD64
SSE4.1
FMA4
SSE4.2
CVT16
AMD-V
3DNow!
AES
Supports dynamic frequency scaling Yes Yes

details

Athlon II XLT V66C  vs
A10 5800K 
Threads 2 4
L2 cache 2 MB 4 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.83 GHz 4.48 GHz
Overclocked clock speed (Water) 2.8 GHz 4.59 GHz
Overclocked clock speed (Air) 3.83 GHz 4.48 GHz

power consumption

TDP 45W 100W
Annual home energy cost 10.84 $/year 24.09 $/year
Annual commercial energy cost 39.42 $/year 87.6 $/year
Typical power consumption 36.56W 81.25W
AMD Athlon II XLT V66C
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AMD A10 5800K
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