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Differences What are the advantages of each

Front view of AMD A8 6600K

Reasons to consider the
AMD A8 6600K

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Much more l2 cache 4 MB vs 1 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much higher clock speed 3.9 GHz vs 3.2 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 performance per watt 5.07 pt/W vs 0.73 pt/W Around 7x better performance per watt
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Significantly higher Maximum operating temperature 74 °C vs 70 °C More than 5% higher Maximum operating temperature
Front view of AMD A4 4020

Reasons to consider the
AMD A4 4020

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Much lower typical power consumption 52.81W vs 81.25W 35% lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 24.09 $/year 35% lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 87.6 $/year 35% lower annual commercial energy cost

Benchmarks Real world tests of A8 6600K vs A4 4020

CompuBench 1.5 (Face detection)

A8 6600K
5.41 mPixels/s
A4 4020
2.54 mPixels/s

CompuBench 1.5 (Ocean surface simulation) Data courtesy CompuBench

A8 6600K
155.63 fps
A4 4020
83.14 fps

CompuBench 1.5 (T-Rex) Data courtesy CompuBench

A8 6600K
0.7 fps
A4 4020
-1 fps

PassMark Data courtesy Passmark

A8 6600K
4,574
A4 4020
1,835

PassMark (Single Core)

A8 6600K
1,460
A4 4020
1,157

Specifications Full list of technical specs

summary

A8 6600K  vs
A4 4020 
Clock speed 3.9 GHz 3.2 GHz
Turbo clock speed 4.2 GHz 3.4 GHz
Cores Quad core Dual core
Is unlocked Yes No

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
AVX 1.1
SSE2
F16C
MMX
XOP
AVX
SSE3
SSE
BMI1
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
ABM
CVT16
AMD-V
Supplemental SSE3
AES
TBM
Supports dynamic frequency scaling Yes Yes

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3

details

A8 6600K  vs
A4 4020 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 4 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 1 1
Operating temperature Unknown - 74°C Unknown - 70°C

integrated graphics

GPU GPU GPU
Label Radeon™ HD 8570D Radeon HD 7480D
GPU clock speed 844 MHz 720 MHz

power consumption

TDP 100W 65W
Annual home energy cost 24.09 $/year 15.66 $/year
Annual commercial energy cost 87.6 $/year 56.94 $/year
Performance per watt 5.07 pt/W 0.73 pt/W
Typical power consumption 81.25W 52.81W
AMD A8 6600K
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AMD A4 4020
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