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Differences What are the advantages of each

Front view of AMD A6 6420B

Reasons to consider the
AMD A6 6420B

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Higher clock speed 4 GHz vs 3.9 GHz Around 5% higher clock speed
Front view of AMD A6 6400K

Reasons to consider the
AMD A6 6400K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much better overclocked clock speed (Air) 4.76 GHz vs 4 GHz Around 20% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 5.16 GHz vs 4 GHz Around 30% better overclocked clock speed (Water)

Benchmarks Real world tests of A6 6420B vs 6400K

PassMark Data courtesy Passmark

A6 6420B
2,612
A6 6400K
2,291

PassMark (Single Core)

A6 6420B
1,580
A6 6400K
1,404

Specifications Full list of technical specs

summary

A6 6420B  vs
6400K 
Clock speed 4 GHz 3.9 GHz
Turbo clock speed 4.2 GHz 4.1 GHz
Cores Dual core Dual core
Is unlocked No Yes

features

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

power consumption

TDP 65W 65W
Annual home energy cost 15.66 $/year 15.66 $/year
Annual commercial energy cost 56.94 $/year 56.94 $/year
Performance per watt 2.18 pt/W 7.25 pt/W
Typical power consumption 52.81W 52.81W

details

A6 6420B  vs
6400K 
Threads 2 2
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache None None
Manufacture process 32 nm 32 nm
Operating temperature Unknown - 70°C Unknown - 70°C

overclocking

Overclocked clock speed 4 GHz 4.76 GHz
Overclocked clock speed (Water) 4 GHz 5.16 GHz
Overclocked clock speed (Air) 4 GHz 4.76 GHz

integrated graphics

GPU GPU GPU
Label Radeon™ HD 8470D Radeon™ HD 8470D
Latest DirectX 11.0 11.0
GPU clock speed 800 MHz 800 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
AMD A6 6420B
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AMD A6 6400K
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