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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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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Higher clock speed 3 GHz vs 2.8 GHz More than 5% higher clock speed
Much better overclocked clock speed (Air) 3.56 GHz vs 2.87 GHz Around 25% better overclocked clock speed (Air)
Higher Maximum operating temperature 72.7 °C vs 70.5 °C Around 5% higher Maximum operating temperature
Much better overclocked clock speed (Water) 3.67 GHz vs 2.5 GHz More than 45% better overclocked clock speed (Water)
Front view of AMD A8 3820

Reasons to consider the
AMD A8 3820

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Much better performance per watt 1.91 pt/W vs 1.03 pt/W More than 85% 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 3820

PCMark 8 Home 3.0 Accelerated Data courtesy FutureMark

A8 3870K
2,346
A8 3820
2,285

Sky Diver Data courtesy FutureMark

A8 3870K
2,532
A8 3820
2,380

Cloud Gate Data courtesy FutureMark

A8 3870K
4,726
A8 3820
4,204

GeekBench 3 (Multi-core) Data courtesy Primate Labs

A8 3870K
5,602
A8 3820
4,151

GeekBench 3 (Single core) Data courtesy Primate Labs

A8 3870K
1,597
A8 3820
1,426

GeekBench 3 (AES single core) Data courtesy Primate Labs

A8 3870K
126,200 MB/s
A8 3820
116.05 MB/s

PassMark Data courtesy Passmark

A8 3870K
3,596
A8 3820
3,152

PassMark (Single Core)

A8 3870K
1,032
A8 3820
874

Specifications Full list of technical specs

summary

A8 3870K  vs
3820 
Clock speed 3 GHz 2.8 GHz
Cores Quad core Quad core
Is unlocked Yes No

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 1.91 pt/W
Typical power consumption N/A 52.81W

details

A8 3870K  vs
3820 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 4 MB 4 MB
L2 cache per core 1 MB/core 1 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 0.45 - 1.41V
Operating temperature Unknown - 72.7°C Unknown - 70.5°C

overclocking

Overclocked clock speed 3.56 GHz 2.87 GHz
Overclocked clock speed (Water) 3.67 GHz 2.5 GHz
Overclocked clock speed (Air) 3.56 GHz 2.87 GHz

integrated graphics

GPU GPU GPU
Label Radeon™ HD 6550D Radeon™ HD 6550D
Latest DirectX 11.0 11.0
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 A8 3820
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