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Differences What are the advantages of each

Front view of AMD Athlon II X2 221

Reasons to consider the
AMD Athlon II X2 221

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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
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
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
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 better overclocked clock speed (Air) 3.56 GHz vs 2.8 GHz More than 25% better overclocked clock speed (Air)
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much higher Maximum operating temperature 72.7 °C vs 65 °C More than 10% higher Maximum operating temperature
Much better overclocked clock speed (Water) 3.67 GHz vs 2.8 GHz More than 30% better overclocked clock speed (Water)

Features Key features of the Athlon II X2 221  vs A8 3870K 

clock speed

A8 3870K
3 GHz

L2 cache

overclocked clock speed (air)

A8 3870K
3.56 GHz

overclocked clock speed (water)

A8 3870K
3.67 GHz

TDP

Specifications Full list of technical specs

summary

Athlon II X2 221  vs
A8 3870K 
Clock speed 2.8 GHz 3 GHz
Cores Dual core Quad 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 65W 100W
Annual home energy cost 15.66 $/year 40.03 $/year
Annual commercial energy cost 56.94 $/year 138.41 $/year
Typical power consumption 52.81W N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3-1333

details

Athlon II X2 221  vs
A8 3870K 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 1 MB 4 MB
L2 cache per core 0.5 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 0.91 - 1.41V 0.45 - 1.41V
Operating temperature Unknown - 65°C Unknown - 72.7°C

overclocking

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

integrated graphics

GPU None GPU
Label N/A Radeon™ HD 6550D
Latest DirectX N/A 11.0
Number of displays supported N/A 2
GPU clock speed N/A 600 MHz
Turbo clock speed N/A 600 MHz
AMD Athlon II X2 221
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AMD A8 3870K
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