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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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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much higher clock speed 4 GHz vs 2.4 GHz More than 65% higher clock speed
Significantly higher turbo clock speed 4.2 GHz vs 3.3 GHz More than 25% 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
Significantly lower typical power consumption 73.94W vs 93.44W More than 20% lower typical power consumption
Significantly more l3 cache per core 2 MB/core vs 0.98 MB/core More than 2x more l3 cache per core
Significantly better overclocked clock speed (Air) 4.61 GHz vs 3.3 GHz Around 40% better overclocked clock speed (Air)
Newer Jul, 2015 vs Jun, 2012 Release date over 3 years later
Much better overclocked clock speed (Water) 4.77 GHz vs 3.3 GHz Around 45% better overclocked clock speed (Water)
Significantly lower annual commercial energy cost 79.72 $/year vs 100.74 $/year More than 20% lower annual commercial energy cost
Significantly lower annual home energy cost 21.92 $/year vs 27.7 $/year More than 20% lower annual home energy cost
Front view of AMD Opteron 6278

Reasons to consider the
AMD Opteron 6278

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Much more l2 cache 16 MB vs 1 MB 16x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 16 vs 4 12 more cores; run more applications at once
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
More l3 cache 15.63 MB vs 8 MB More than 95% more l3 cache; more data can be stored in the l3 cache for quick access later
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
More threads 16 vs 8 Twice as many threads
Higher Maximum operating temperature 69 °C vs 64 °C Around 10% higher Maximum operating temperature

Features Key features of the Core i7 6700K  vs Opteron 6278 

clock speed

Opteron 6278
2.4 GHz

turbo clock speed

Core i7 6700K
4.2 GHz
Opteron 6278
3.3 GHz

L2 cache

L3 cache

Opteron 6278
15.63 MB

overclocked clock speed (air)

Core i7 6700K
4.61 GHz
Opteron 6278
3.3 GHz

overclocked clock speed (water)

Core i7 6700K
4.77 GHz
Opteron 6278
3.3 GHz

Specifications Full list of technical specs

summary

Core i7 6700K  vs
Opteron 6278 
Clock speed 4 GHz 2.4 GHz
Turbo clock speed 4.2 GHz 3.3 GHz
Cores Quad core 16 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 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

bus

Architecture FSB HyperTransport 3.0
Number of links 0 4
Transfer rate 8,000 MT/s 6,400 MT/s

details

Core i7 6700K  vs
Opteron 6278 
Threads 8 16
L2 cache 1 MB 16 MB
L2 cache per core 0.25 MB/core 1 MB/core
L3 cache 8 MB 15.63 MB
L3 cache per core 2 MB/core 0.98 MB/core
Manufacture process 14 nm 32 nm
Max CPUs 1 4
Operating temperature Unknown - 64°C Unknown - 69°C

overclocking

Overclocked clock speed 4.61 GHz 3.3 GHz
Overclocked clock speed (Water) 4.77 GHz 3.3 GHz
Overclocked clock speed (Air) 4.61 GHz 3.3 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
Intel Core i7 6700K
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AMD Opteron 6278
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