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Differences What are the advantages of each

Front view of Intel Core i5 6600K

Reasons to consider the
Intel Core i5 6600K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much newer manufacturing process 14 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 3.5 GHz vs 2.9 GHz More than 20% higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Newer Jul, 2015 vs Feb, 2009 Release date over 6 years later
Much better overclocked clock speed (Air) 4.54 GHz vs 2.9 GHz More than 55% better overclocked clock speed (Air)
Higher Maximum operating temperature 64 °C vs 55 °C More than 15% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.57 GHz vs 2.9 GHz Around 60% better overclocked clock speed (Water)
Front view of AMD Opteron 2389

Reasons to consider the
AMD Opteron 2389

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Significantly more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Lower typical power consumption 60.94W vs 73.94W Around 20% lower typical power consumption
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Lower annual home energy cost 18.07 $/year vs 21.92 $/year Around 20% lower annual home energy cost
Lower annual commercial energy cost 65.7 $/year vs 79.72 $/year Around 20% lower annual commercial energy cost

Features Key features of the Core i5 6600K  vs Opteron 2389 

clock speed

Core i5 6600K
3.5 GHz
Opteron 2389
2.9 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Core i5 6600K
4.54 GHz
Opteron 2389
2.9 GHz

overclocked clock speed (water)

Core i5 6600K
4.57 GHz
Opteron 2389
2.9 GHz

Specifications Full list of technical specs

summary

Core i5 6600K  vs
Opteron 2389 
Clock speed 3.5 GHz 2.9 GHz
Cores Quad core Quad 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
3DNow!
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 91W 75W
Annual home energy cost 21.92 $/year 18.07 $/year
Annual commercial energy cost 79.72 $/year 65.7 $/year
Typical power consumption 73.94W 60.94W

details

Core i5 6600K  vs
Opteron 2389 
Threads 4 4
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 6 MB 6 MB
L3 cache per core 1.5 MB/core 1.5 MB/core
Manufacture process 14 nm 45 nm
Max CPUs 1 2
Operating temperature Unknown - 64°C 0 - 55°C

overclocking

Overclocked clock speed 4.54 GHz 2.9 GHz
Overclocked clock speed (Water) 4.57 GHz 2.9 GHz
Overclocked clock speed (Air) 4.54 GHz 2.9 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

bus

Architecture FSB HyperTransport 3.0
Intel Core i5 6600K
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AMD Opteron 2389
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