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Differences What are the advantages of each

Front view of Intel Core i5 6400

Reasons to consider the
Intel Core i5 6400

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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
Higher clock speed 2.7 GHz vs 2.5 GHz Around 10% higher clock speed
Significantly better overclocked clock speed (Air) 3.67 GHz vs 2.5 GHz More than 45% better overclocked clock speed (Air)
Slightly more l3 cache 6 MB vs 4 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
Newer Jul, 2015 vs Mar, 2012 Release date over 3 years later
More l3 cache per core 1.5 MB/core vs 1 MB/core 50% more l3 cache per core
Much better overclocked clock speed (Water) 4.34 GHz vs 2.5 GHz Around 75% better overclocked clock speed (Water)
Front view of AMD Opteron 3250 HE

Reasons to consider the
AMD Opteron 3250 HE

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Slightly higher turbo clock speed 3.5 GHz vs 3.3 GHz More than 5% higher turbo clock speed
Lower typical power consumption 36.56W vs 52.81W More than 30% lower typical power consumption
Lower annual home energy cost 10.84 $/year vs 15.66 $/year More than 30% lower annual home energy cost
Lower annual commercial energy cost 39.42 $/year vs 56.94 $/year More than 30% lower annual commercial energy cost

Features Key features of the Core i5 6400  vs Opteron 3250 HE 

clock speed

Core i5 6400
2.7 GHz
Opteron 3250 HE
2.5 GHz

turbo clock speed

Core i5 6400
3.3 GHz
Opteron 3250 HE
3.5 GHz

L3 cache

overclocked clock speed (air)

Core i5 6400
3.67 GHz
Opteron 3250 HE
2.5 GHz

overclocked clock speed (water)

Core i5 6400
4.34 GHz
Opteron 3250 HE
2.5 GHz

Specifications Full list of technical specs

summary

Core i5 6400  vs
Opteron 3250 HE 
Clock speed 2.7 GHz 2.5 GHz
Turbo clock speed 3.3 GHz 3.5 GHz
Cores Quad core Quad core
Is unlocked No 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 65W 45W
Annual home energy cost 15.66 $/year 10.84 $/year
Annual commercial energy cost 56.94 $/year 39.42 $/year
Typical power consumption 52.81W 36.56W

bus

Architecture FSB HyperTransport 3.0

details

Core i5 6400  vs
Opteron 3250 HE 
Threads 4 4
L3 cache 6 MB 4 MB
L3 cache per core 1.5 MB/core 1 MB/core
Manufacture process 14 nm 32 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.67 GHz 2.5 GHz
Overclocked clock speed (Water) 4.34 GHz 2.5 GHz
Overclocked clock speed (Air) 3.67 GHz 2.5 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 950 MHz N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3
Intel Core i5 6400
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AMD Opteron 3250 HE
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