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Differences What are the advantages of each

Front view of AMD Opteron 840

Reasons to consider the
AMD Opteron 840

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Lower typical power consumption 66.71W vs 77.19W Around 15% lower typical power consumption
Lower annual home energy cost 19.78 $/year vs 22.89 $/year Around 15% lower annual home energy cost
Lower annual commercial energy cost 71.92 $/year vs 83.22 $/year Around 15% lower annual commercial energy cost
Front view of AMD Athlon X4 860K

Reasons to consider the
AMD Athlon X4 860K

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Much newer manufacturing process 28 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
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
Much higher clock speed 3.7 GHz vs 1.4 GHz Around 2.8x higher clock speed
Much better overclocked clock speed (Air) 4.37 GHz vs 1.69 GHz More than 2.5x better overclocked clock speed (Air)
Newer Aug, 2014 vs Jun, 2003 Release date over 11 years later
More cores 4 vs 1 3 more cores; run more applications at once
Much better overclocked clock speed (Water) 4.45 GHz vs 1.4 GHz Around 3.2x better overclocked clock speed (Water)

Features Key features of the Opteron 840  vs Athlon X4 860K 

clock speed

Opteron 840
1.4 GHz
Athlon X4 860K
3.7 GHz

L2 cache

overclocked clock speed (air)

Opteron 840
1.69 GHz
Athlon X4 860K
4.37 GHz

overclocked clock speed (water)

Opteron 840
1.4 GHz
Athlon X4 860K
4.45 GHz

TDP

Specifications Full list of technical specs

summary

Opteron 840  vs
Athlon X4 860K 
Clock speed 1.4 GHz 3.7 GHz
Cores Single core Quad core

features

Has a NX bit Yes Yes
Instruction set extensions
SSE4a
SSE2
F16C
MMX
AVX
SSE3
SSE
BMI1
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
AMD-V
3DNow!
Supplemental SSE3
AES
TBM

details

Opteron 840  vs
Athlon X4 860K 
L2 cache 1 MB 4 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 130 nm 28 nm

overclocking

Overclocked clock speed 1.69 GHz 4.37 GHz
Overclocked clock speed (Water) 1.4 GHz 4.45 GHz
Overclocked clock speed (Air) 1.69 GHz 4.37 GHz

power consumption

TDP 82.1W 95W
Annual home energy cost 19.78 $/year 22.89 $/year
Annual commercial energy cost 71.92 $/year 83.22 $/year
Typical power consumption 66.71W 77.19W
AMD Opteron 840
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AMD Athlon X4 860K
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