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Differences What are the advantages of each

Front view of AMD Athlon II X4 640

Reasons to consider the
AMD Athlon II X4 640

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Much higher clock speed 3 GHz vs 0.85 GHz More than 3.5x higher clock speed
More cores 4 vs 1 3 more cores; run more applications at once
More threads 4 vs 1 3 more threads
Much better overclocked clock speed (Air) 3.8 GHz vs 1.02 GHz Around 3.8x better overclocked clock speed (Air)
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Water) 3.89 GHz vs 0.85 GHz More than 4.5x better overclocked clock speed (Water)
Front view of AMD Athlon 850

Reasons to consider the
AMD Athlon 850

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CPUBoss is not aware of any important advantages of the Athlon 850 vs the Athlon II X4 640.

Features Key features of the Athlon II X4 640  vs 850 

clock speed

Athlon 850
0.85 GHz

L2 cache

overclocked clock speed (air)

Athlon 850
1.02 GHz

overclocked clock speed (water)

Athlon II X4 640
3.89 GHz
Athlon 850
0.85 GHz

Specifications Full list of technical specs

summary

Athlon II X4 640  vs
850 
Clock speed 3 GHz 0.85 GHz
Cores Quad core Single core
Socket type
AM3
462
Slot A

features

Has a NX bit Yes No
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!

bus

Clock speed 2,000 MHz 200 MHz

details

Athlon II X4 640  vs
850 
Threads 4 1
L2 cache 2 MB 0.5 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 180 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.8 GHz 1.02 GHz
Overclocked clock speed (Water) 3.89 GHz 0.85 GHz
PassMark (Overclocked) 2,020.8 212.8
Overclocked clock speed (Air) 3.8 GHz 1.02 GHz

power consumption

Typical power consumption 77.19W N/A
AMD Athlon II X4 640
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AMD Athlon 850
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