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Differences What are the advantages of each

Front view of AMD A6 7400K

Reasons to consider the
AMD A6 7400K

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Newer manufacturing process 28 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Front view of AMD A6 6420K

Reasons to consider the
AMD A6 6420K

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Significantly higher clock speed 4 GHz vs 3.5 GHz Around 15% higher clock speed

Benchmarks Real world tests of A6 7400K vs 6420K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

A6 7400K
3,180
A6 6420K
3,501

GeekBench 3 (Single core) Data courtesy Primate Labs

A6 7400K
2,081
A6 6420K
2,245

GeekBench 3 (AES single core) Data courtesy Primate Labs

A6 7400K
1,910 MB/s
A6 6420K
2,770 MB/s

PassMark Data courtesy Passmark

A6 7400K
2,794
A6 6420K
2,251

PassMark (Single Core)

A6 7400K
1,573
A6 6420K
1,428

Specifications Full list of technical specs

summary

A6 7400K  vs
6420K 
Clock speed 3.5 GHz 4 GHz
Cores Dual core Dual core
Socket type
FM2+
Is unlocked Yes Yes

features

Has a NX bit Yes Yes
Supports trusted computing No No
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
Channels Dual Channel Dual Channel
Maximum bandwidth 29,866.66 MB/s 12,800 MB/s

details

A6 7400K  vs
6420K 
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
Manufacture process 28 nm 32 nm
Max CPUs 1 1
Operating temperature Unknown - 70°C Unknown - 70°C

integrated graphics

GPU GPU GPU
Label Radeon R5 series Radeon HD 8000 series

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 2.8 pt/W 1.61 pt/W
Typical power consumption 52.81W 52.81W
AMD A6 7400K
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AMD A6 6420K
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