What Is Difference between dual channel and single channel?Is there any difference in performance

Solution
To expand a little bit: Quad channel really does have almost twice the memory bandwidth of Dual channel, which really does have almost twice the memory bandwidth of Single channel.
The catch is that, for most applications, memory bandwidth isn't the bottleneck - so increasing the memory bandwidth doesn't improve the ultimate application performance very much.

V1ctor89

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Usually, motherboards with 4 RAM slots are paired (coloured). If you insert 2 RAM sticks into same colour slots, then they will work in dual-channel. Dual-channel is about 20% faster than single-channel.
 
To expand a little bit: Quad channel really does have almost twice the memory bandwidth of Dual channel, which really does have almost twice the memory bandwidth of Single channel.
The catch is that, for most applications, memory bandwidth isn't the bottleneck - so increasing the memory bandwidth doesn't improve the ultimate application performance very much.
 
Solution

Thanoj

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So You tell there is little no difference on ram for gaming. Now Another Doubt what's a quad channel
 

Quad channel is to Dual channel as Dual channel is to Single channel - running the memory "4-wide".

It is only supported on the higher-end chipsets like x79 or x99 - workstation and server chipsets basically.

What do you mean by 'Doubt' - there is no good reason to run a dual channel capable motherboard in single channel mode - 1X8GB stick is usually within a few dollars of 2X4GB sticks (example assumes 8 GB total memory).