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Differences What are the advantages of each

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 3.9 GHz More than 20% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 5.16 GHz vs 3.9 GHz More than 30% better overclocked clock speed (Water)
Front view of AMD A6 6400B

Reasons to consider the
AMD A6 6400B

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Significantly higher Maximum operating temperature 74 °C vs 70 °C More than 5% higher Maximum operating temperature

Benchmarks Real world tests of A6 6400K vs 6400B

3D Mark 06 (CPU)

A6 6400K
25.1
A6 6400B
2,654

PassMark Data courtesy Passmark

A6 6400K
2,291
A6 6400B
2,281

PassMark (Single Core)

A6 6400K
1,404
A6 6400B
1,387

Specifications Full list of technical specs

summary

A6 6400K  vs
6400B 
Clock speed 3.9 GHz 3.9 GHz
Turbo clock speed 4.1 GHz 4.1 GHz
Cores Dual 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

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 7.25 pt/W 1.91 pt/W
Typical power consumption 52.81W 52.81W

details

A6 6400K  vs
6400B 
Architecture x86-64 x86-64
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
Max CPUs 1 1
Operating temperature Unknown - 70°C Unknown - 74°C

overclocking

Overclocked clock speed 4.76 GHz 3.9 GHz
Overclocked clock speed (Water) 5.16 GHz 3.9 GHz
Overclocked clock speed (Air) 4.76 GHz 3.9 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 6400K
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AMD A6 6400B
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