At the height of mining craze I bought a Dell pre-built because it was the only way to get an RX 580 at a sane price. (At the time they were going for US$600+.) One of the limitations of this pre-built was the memory speed. It came with a single stick of DDR4 RAM @ 2400 MHz, and only supports JEDEC speeds (max 2666 I believe.) Upgrading to dual channel gave me a massive speed boost in some (mostly Ubisoft) games.
Would upgrading to 2666 ram net me a significant boost? Would it make sense to buy a X370 mobo and transplant my existing components and upgrade to 3200Mhz RAM?