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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 2.2 GHz More than 80% higher clock speed
Much newer manufacturing process 14 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.61 GHz vs 2.2 GHz More than 2x better overclocked clock speed (Air)
More threads 8 vs 4 Twice as many threads
Newer Jul, 2015 vs Nov, 2011 Release date over 3 years later
Much better overclocked clock speed (Water) 4.77 GHz vs 2.2 GHz Around 2.2x better overclocked clock speed (Water)
Front view of AMD Opteron 42DX EE

Reasons to consider the
AMD Opteron 42DX EE

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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
Much lower typical power consumption 32.5W vs 73.94W 2.3x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much lower annual home energy cost 9.64 $/year vs 21.92 $/year 2.3x lower annual home energy cost
Much lower annual commercial energy cost 35.04 $/year vs 79.72 $/year 2.3x lower annual commercial energy cost

Features Key features of the Core i7 6700K  vs Opteron 42DX EE 

clock speed

L2 cache

L3 cache

overclocked clock speed (air)

Core i7 6700K
4.61 GHz
Opteron 42DX EE
2.2 GHz

overclocked clock speed (water)

Core i7 6700K
4.77 GHz
Opteron 42DX EE
2.2 GHz

Specifications Full list of technical specs

summary

Core i7 6700K  vs
Opteron 42DX EE 
Clock speed 4 GHz 2.2 GHz
Cores Quad core Quad 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
Supplemental SSE3
AES
AVX 2.0

bus

Architecture FSB HyperTransport 3.0
Transfer rate 8,000 MT/s 6,400 MT/s

details

Core i7 6700K  vs
Opteron 42DX EE 
Threads 8 4
L2 cache 1 MB 4 MB
L2 cache per core 0.25 MB/core 1 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 14 nm 32 nm
Max CPUs 1 2

overclocking

Overclocked clock speed 4.61 GHz 2.2 GHz
Overclocked clock speed (Water) 4.77 GHz 2.2 GHz
Overclocked clock speed (Air) 4.61 GHz 2.2 GHz

power consumption

TDP 91W 40W
Annual home energy cost 21.92 $/year 9.64 $/year
Annual commercial energy cost 79.72 $/year 35.04 $/year
Typical power consumption 73.94W 32.5W
Intel Core i7 6700K
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AMD Opteron 42DX EE
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