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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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Much higher clock speed 3 GHz vs 2.7 GHz More than 10% higher clock speed
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 4 vs 2 Twice as many threads
Much better overclocked clock speed (Water) 3.49 GHz vs 2.7 GHz Around 30% better overclocked clock speed (Water)
Front view of AMD A4 3400

Reasons to consider the
AMD A4 3400

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required

Features Key features of the Athlon II X4 651K  vs A4 3400 

clock speed

A4 3400
2.7 GHz

L2 cache

overclocked clock speed (air)

A4 3400
3.5 GHz

overclocked clock speed (water)

A4 3400
2.7 GHz

TDP

Specifications Full list of technical specs

summary

Athlon II X4 651K  vs
A4 3400 
Clock speed 3 GHz 2.7 GHz
Turbo clock speed None None
Cores Quad core Dual core
Socket type
FM1
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
A4 3400 
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 0.91 - 1.41V 0.91 - 1.41V

overclocking

Overclock popularity 1 10
Overclocked clock speed 3.43 GHz 3.5 GHz
Overclocked clock speed (Water) 3.49 GHz 2.7 GHz
Overclocked clock speed (Air) 3.43 GHz 3.5 GHz

integrated graphics

GPU None GPU
Label N/A Radeon™ HD 6410D
Latest DirectX N/A 11.0
GPU clock speed N/A 600 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
AMD Athlon II X4 651K
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AMD A4 3400
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