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Differences What are the advantages of each

Front view of Intel Core i7 4790K

Reasons to consider the
Intel Core i7 4790K

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Much more l3 cache 8 MB vs None Compared to all cpus, 8 MB l3 cache is just OK
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 8 vs 2 6 more threads
Much newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.63 GHz vs 4 GHz More than 15% better overclocked clock speed (Air)
Significantly higher Maximum operating temperature 74.04 °C vs 70 °C More than 5% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.8 GHz vs 4 GHz Around 20% better overclocked clock speed (Water)
Front view of AMD A6 6420B

Reasons to consider the
AMD A6 6420B

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Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Significantly lower typical power consumption 52.81W vs 71.5W More than 25% lower typical power consumption
Significantly lower annual home energy cost 15.66 $/year vs 21.2 $/year More than 25% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 77.09 $/year More than 25% lower annual commercial energy cost

Benchmarks Real world tests of Core i7 4790K vs A6 6420B

PassMark Data courtesy Passmark

Core i7 4790K
11,194
A6 6420B
2,612

PassMark (Single Core)

A6 6420B
1,580

Specifications Full list of technical specs

summary

Core i7 4790K  vs
A6 6420B 
Clock speed 4 GHz 4 GHz
Turbo clock speed 4.4 GHz 4.2 GHz
Cores Quad core Dual core
Is unlocked Yes No

features

Has virtualization support Yes Yes
Instruction set extensions
SSE2
F16C
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
FMA4
FMA3
SSE4.2
AES
AVX 2.0

power consumption

TDP 88W 65W
Annual home energy cost 21.2 $/year 15.66 $/year
Annual commercial energy cost 77.09 $/year 56.94 $/year
Performance per watt 11.42 pt/W 2.18 pt/W
Typical power consumption 71.5W 52.81W

details

Core i7 4790K  vs
A6 6420B 
Threads 8 2
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB None
Manufacture process 22 nm 32 nm
Operating temperature Unknown - 74.04°C Unknown - 70°C

overclocking

Overclocked clock speed 4.63 GHz 4 GHz
Overclocked clock speed (Water) 4.8 GHz 4 GHz
Overclocked clock speed (Air) 4.63 GHz 4 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 4600 Radeon™ HD 8470D
GPU clock speed 350 MHz 800 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3L-1600
DDR3-1333
Intel Core i7 4790K
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AMD A6 6420B
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