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Differences What are the advantages of each

Front view of AMD Athlon X4 750

Reasons to consider the
AMD Athlon X4 750

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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
More cores 4 vs 2 Twice as many cores; run more applications at once
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Higher Maximum operating temperature 71.3 °C vs 70 °C Almost the same
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 0.88 GHz Around 5.5x better overclocked clock speed (Air)
Significantly higher clock speed 3.9 GHz vs 3.4 GHz Around 15% higher clock speed
Much better overclocked clock speed (Water) 5.16 GHz vs 0.75 GHz Around 7x better overclocked clock speed (Water)

Benchmarks Real world tests of Athlon X4 750 vs A6 6400K

PassMark Data courtesy Passmark

A6 6400K
2,291

PassMark (Single Core)

A6 6400K
1,404

Specifications Full list of technical specs

summary

Athlon X4 750  vs
A6 6400K 
Clock speed 3.4 GHz 3.9 GHz
Turbo clock speed 4 GHz 4.1 GHz
Cores Quad 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

memory controller

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

details

Athlon X4 750  vs
A6 6400K 
L2 cache 4 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
L3 cache 0 MB None
Manufacture process 32 nm 32 nm
Operating temperature Unknown - 71.3°C Unknown - 70°C

overclocking

Overclocked clock speed 0.88 GHz 4.76 GHz
Overclocked clock speed (Water) 0.75 GHz 5.16 GHz
Overclocked clock speed (Air) 0.88 GHz 4.76 GHz

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 2.69 pt/W 7.25 pt/W
Typical power consumption 52.81W 52.81W
AMD Athlon X4 750
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AMD A6 6400K
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