dual channel with dedicated gpu

Solution
If you are getting a dedicated GPU you may want to buy a Ryzen 2600 instead, unless its outside your budget that is.

To answer your question the GPU has nothing to do with the RAM of the system, and you should always try and get dual channel, especially with Ryzen. If you don't you are effectively cutting the bandwidth of system memory in half, and in memory heavy applications, including many games this will be noticeable.
If you are getting a dedicated GPU you may want to buy a Ryzen 2600 instead, unless its outside your budget that is.

To answer your question the GPU has nothing to do with the RAM of the system, and you should always try and get dual channel, especially with Ryzen. If you don't you are effectively cutting the bandwidth of system memory in half, and in memory heavy applications, including many games this will be noticeable.
 
Solution