i7-4790k & i7-3820 Memory Bandwith Problem?

Revenge96

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Jul 16, 2015
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(Sorry for bad english) Hello there, so, i'm making a new Desktop PC with an i7-4790k...i compared it with my old CPU, the i7-3820...and i saw that there is a particular specification, the maximum memory bandwith:
i7-3820: 51,2 GB/s
i7-4790k: 25,6 GB/s
That made me think, and i was wondering, because i'm pretty ignorant to these arguments, is it related to the RAM? does make it a difference if i have only 16 GB of ram?
 
Solution
In short : you would not see extra performance except if you have 4 x 4 GB ram sticks , do not upgrade into 4790 if you still have 3820 working ; you will not see any noticeable performance increase . however you get lower heat and temperature output , which is not worth buying 4790 over 3820

In details :
it is because of the memory channels in the processor 3820 has a quad channel and 4790 has dual channel
quad channel has higher speed than the dual channel for the same memory size but require more memory sticks

Motherboard generally have :
Dual channel ram slots
A1 colored black for example
A2 colored red for example
B1 colored black for example
B2 colored red for example

If you have 2 x 4 GB ram and you want to use dual channel...
In short : you would not see extra performance except if you have 4 x 4 GB ram sticks , do not upgrade into 4790 if you still have 3820 working ; you will not see any noticeable performance increase . however you get lower heat and temperature output , which is not worth buying 4790 over 3820

In details :
it is because of the memory channels in the processor 3820 has a quad channel and 4790 has dual channel
quad channel has higher speed than the dual channel for the same memory size but require more memory sticks

Motherboard generally have :
Dual channel ram slots
A1 colored black for example
A2 colored red for example
B1 colored black for example
B2 colored red for example

If you have 2 x 4 GB ram and you want to use dual channel ; you will install the first stick in A1 slot which is black , and the other stick in B1 which is colored black too , they come in same color to make it easy to install dual channel for you
Generally motherboard design ram slots :
On quad channel processors :
A1 red
A2 black
B1 red
B2 black
on the left of the processor
--------------------------------
c2 red
c1 black
d2 red
d1 black
on the right of the processor

to install quad channel memory you need to install dual channels on each size (put a ram stick in each black on a side and each red on the other side )
mean that you need at least 4 ram sticks to use quad channel
 
Solution
Lets say that i already bought everything, and i have 2 x 8 GB ram with a dual channel motherboard...i should put those 2 stick in: A1 the first one, and B1 the second one?
 

you will see 2 colors in ram slots on motherboard
Put the two sticks in same color slots (black if available)