quick question.
i have a mixed rig. with amd and nvidea.
one is a 4gb amd and the other an 8gb amd.  and the others are bigger than 4gb nvidea
i want to continue to mine eth with my 8 and etc with my 4gb.
how do i turn off the 4gb?
i understand i will need to run to instances of the miner.
just not sure the command.
thanks to any help.