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Differences What are the advantages of each

Front view of AMD A8 3870K

Reasons to consider the
AMD A8 3870K

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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
More threads 4 vs 2 Twice as many threads
Higher clock speed 3 GHz vs 2.8 GHz More than 5% higher clock speed
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Water) 3.67 GHz vs 2.8 GHz More than 30% better overclocked clock speed (Water)
Front view of AMD A4 3420

Reasons to consider the
AMD A4 3420

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Much better performance per watt 1.57 pt/W vs 1.03 pt/W Around 55% better performance per watt
Much lower annual home energy cost 15.66 $/year vs 40.03 $/year 2.6x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 138.41 $/year 2.4x lower annual commercial energy cost

Benchmarks Real world tests of A8 3870K vs A4 3420

Sky Diver Data courtesy FutureMark

A8 3870K
2,532
A4 3420
1,104

Cloud Gate Data courtesy FutureMark

A8 3870K
4,726
A4 3420
2,474

GeekBench 3 (Multi-core) Data courtesy Primate Labs

A8 3870K
5,602
A4 3420
2,532

GeekBench 3 (Single core) Data courtesy Primate Labs

A8 3870K
1,597
A4 3420
1,403

GeekBench 3 (AES single core) Data courtesy Primate Labs

A8 3870K
126,200 MB/s
A4 3420
113,100 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

A8 3870K
5,339
A4 3420
2,510

PassMark Data courtesy Passmark

A8 3870K
3,596
A4 3420
1,679

PassMark (Single Core)

A8 3870K
1,032
A4 3420
929

Specifications Full list of technical specs

summary

A8 3870K  vs
A4 3420 
Clock speed 3 GHz 2.8 GHz
Cores Quad core Dual core
Socket type
FM1

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
AMD64
AMD-V
3DNow!
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 100W 65W
Annual home energy cost 40.03 $/year 15.66 $/year
Annual commercial energy cost 138.41 $/year 56.94 $/year
Performance per watt 1.03 pt/W 1.57 pt/W
Typical power consumption N/A 52.81W

details

A8 3870K  vs
A4 3420 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 4 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 32 nm 32 nm
Transistor count 1,178,000,000 1,178,000,000
Max CPUs 1 1
Die size 228 mm² 228 mm²
Voltage range 0.45 - 1.41V 0.91 - 1.41V

overclocking

Overclocked clock speed 3.56 GHz 3.58 GHz
Overclocked clock speed (Water) 3.67 GHz 2.8 GHz
Overclocked clock speed (Air) 3.56 GHz 3.58 GHz

integrated graphics

GPU GPU GPU
Label Radeon™ HD 6550D AMD Radeon HD 6410D
GPU clock speed 600 MHz 600 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3-1333
AMD A8 3870K
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AMD A4 3420
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