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Differences What are the advantages of each

Front view of AMD Athlon II X4 631

Reasons to consider the
AMD Athlon II X4 631

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CPUBoss is not aware of any important advantages of the Athlon II X4 631 vs the A8 3870K.

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

Benchmarks Real world tests of Athlon II X4 631 vs A8 3870K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Athlon II X4 631
109,100 MB/s
A8 3870K
126,200 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

3D Mark 11 (Physics)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Athlon II X4 631  vs
A8 3870K 
Clock speed 2.6 GHz 3 GHz
Cores Dual core Quad core
Socket type
FM1
Is unlocked No Yes

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 100W
Annual home energy cost 24.09 $/year 40.03 $/year
Annual commercial energy cost 87.6 $/year 138.41 $/year
Performance per watt 1.32 pt/W 1.03 pt/W
Typical power consumption 81.25W N/A

details

Athlon II X4 631  vs
A8 3870K 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 4 MB 4 MB
L2 cache per core 2 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 - 70.1°C Unknown - 72.7°C

overclocking

Overclock popularity 5 32
Overclocked clock speed 4.03 GHz 3.56 GHz
Overclocked clock speed (Water) 2.6 GHz 3.67 GHz
Overclocked clock speed (Air) 4.03 GHz 3.56 GHz

integrated graphics

GPU GPU GPU
Label AMD Radeon Aug 15, 2011 Radeon™ HD 6550D

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3-1333
AMD Athlon II X4 631
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AMD A8 3870K
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