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Differences What are the advantages of each

Front view of AMD Athlon II X4 651K

Reasons to consider the
AMD Athlon II X4 651K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Significantly higher clock speed 3 GHz vs 2.5 GHz 20% higher clock speed
Much better overclocked clock speed (Air) 3.43 GHz vs 2.85 GHz More than 20% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.49 GHz vs 2.2 GHz Around 60% better overclocked clock speed (Water)
Front view of AMD A6 3620

Reasons to consider the
AMD A6 3620

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 52.81W vs 81.25W 35% lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 24.09 $/year 35% lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 87.6 $/year 35% lower annual commercial energy cost

Features Key features of the Athlon II X4 651K  vs A6 3620 

clock speed

A6 3620
2.5 GHz

L2 cache

overclocked clock speed (air)

A6 3620
2.85 GHz

overclocked clock speed (water)

A6 3620
2.2 GHz

TDP

Specifications Full list of technical specs

summary

Athlon II X4 651K  vs
A6 3620 
Clock speed 3 GHz 2.5 GHz
Turbo clock speed None 2.5 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 24.09 $/year 15.66 $/year
Annual commercial energy cost 87.6 $/year 56.94 $/year
Typical power consumption 81.25W 52.81W

details

Athlon II X4 651K  vs
A6 3620 
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 0.91 - 1.41V 0.45 - 1.41V

overclocking

Overclocked clock speed 3.43 GHz 2.85 GHz
Overclocked clock speed (Water) 3.49 GHz 2.2 GHz
Overclocked clock speed (Air) 3.43 GHz 2.85 GHz

integrated graphics

GPU None GPU
Label N/A Radeon™ HD 6530D
Latest DirectX N/A 11.0
GPU clock speed N/A 443 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
AMD Athlon II X4 651K
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AMD A6 3620
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