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Differences What are the advantages of each

Front view of Intel Core i7 6700K

Reasons to consider the
Intel Core i7 6700K

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Much higher clock speed 4 GHz vs 2 GHz 2x higher clock speed
Much newer manufacturing process 14 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.61 GHz vs 2 GHz More than 2.2x better overclocked clock speed (Air)
Significantly lower typical power consumption 73.94W vs 93.44W More than 20% lower typical power consumption
Newer Jul, 2015 vs Mar, 2010 Release date over 5 years later
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Much better overclocked clock speed (Water) 4.77 GHz vs 2 GHz Around 2.5x better overclocked clock speed (Water)
Significantly lower annual home energy cost 21.92 $/year vs 27.7 $/year More than 20% lower annual home energy cost
Significantly lower annual commercial energy cost 79.72 $/year vs 100.74 $/year More than 20% lower annual commercial energy cost
Front view of AMD Opteron 61KS

Reasons to consider the
AMD Opteron 61KS

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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
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
More l3 cache 12 MB vs 8 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
More cores 8 vs 4 Twice as many cores; run more applications at once
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Features Key features of the Core i7 6700K  vs Opteron 61KS 

clock speed

L2 cache

L3 cache

overclocked clock speed (air)

Core i7 6700K
4.61 GHz
Opteron 61KS
2 GHz

overclocked clock speed (water)

Core i7 6700K
4.77 GHz
Opteron 61KS
2 GHz

Specifications Full list of technical specs

summary

Core i7 6700K  vs
Opteron 61KS 
Clock speed 4 GHz 2 GHz
Cores Quad core Octa core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
AVX 2.0

bus

Architecture FSB HyperTransport 3.0

details

Core i7 6700K  vs
Opteron 61KS 
Threads 8 8
L2 cache 1 MB 4 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB 12 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 14 nm 45 nm
Max CPUs 1 4

overclocking

Overclocked clock speed 4.61 GHz 2 GHz
Overclocked clock speed (Water) 4.77 GHz 2 GHz
Overclocked clock speed (Air) 4.61 GHz 2 GHz

power consumption

TDP 91W 115W
Annual home energy cost 21.92 $/year 27.7 $/year
Annual commercial energy cost 79.72 $/year 100.74 $/year
Typical power consumption 73.94W 93.44W
Intel Core i7 6700K
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AMD Opteron 61KS
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