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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 1.6 GHz Around 2.5x higher clock speed
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much higher turbo clock speed 4.2 GHz vs 2.8 GHz More than 50% higher turbo clock speed
Much newer manufacturing process 14 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much better overclocked clock speed (Air) 4.61 GHz vs 1.6 GHz Around 3x better overclocked clock speed (Air)
Significantly more l3 cache per core 2 MB/core vs 1 MB/core 2x more l3 cache per core
Newer Jul, 2015 vs Nov, 2011 Release date over 3 years later
Much better overclocked clock speed (Water) 4.77 GHz vs 1.6 GHz Around 3x better overclocked clock speed (Water)
Front view of AMD Opteron 4256 EE

Reasons to consider the
AMD Opteron 4256 EE

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Much more l2 cache 8 MB vs 1 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
Much lower typical power consumption 28.44W vs 73.94W 2.6x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
More cores 8 vs 4 Twice as many cores; run more applications at once
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much lower annual home energy cost 8.43 $/year vs 21.92 $/year 2.6x lower annual home energy cost
Much lower annual commercial energy cost 30.66 $/year vs 79.72 $/year 2.6x lower annual commercial energy cost

Features Key features of the Core i7 6700K  vs Opteron 4256 EE 

clock speed

turbo clock speed

Core i7 6700K
4.2 GHz
Opteron 4256 EE
2.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Core i7 6700K
4.61 GHz
Opteron 4256 EE
1.6 GHz

overclocked clock speed (water)

Core i7 6700K
4.77 GHz
Opteron 4256 EE
1.6 GHz

Specifications Full list of technical specs

summary

Core i7 6700K  vs
Opteron 4256 EE 
Clock speed 4 GHz 1.6 GHz
Turbo clock speed 4.2 GHz 2.8 GHz
Cores Quad core Octa core
Is unlocked Yes No

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

power consumption

TDP 91W 35W
Annual home energy cost 21.92 $/year 8.43 $/year
Annual commercial energy cost 79.72 $/year 30.66 $/year
Typical power consumption 73.94W 28.44W

bus

Architecture FSB HyperTransport 3.0
Number of links 0 2
Transfer rate 8,000 MT/s 6,400 MT/s

details

Core i7 6700K  vs
Opteron 4256 EE 
Threads 8 8
L2 cache 1 MB 8 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 1 MB/core
Manufacture process 14 nm 32 nm
Max CPUs 1 2
Operating temperature Unknown - 64°C Unknown - 64°C

overclocking

Overclocked clock speed 4.61 GHz 1.6 GHz
Overclocked clock speed (Water) 4.77 GHz 1.6 GHz
Overclocked clock speed (Air) 4.61 GHz 1.6 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics 530 N/A
Number of displays supported 3 N/A
GPU clock speed 350 MHz N/A
Turbo clock speed 1,150 MHz N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3-1600
Intel Core i7 6700K
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AMD Opteron 4256 EE
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