He mean to use the RAM of the GPU to decrypt ETH
And use the CPU of the GPU to mine somethink other,

Works, but you need more Power and also produce more heat from the Cards,
Because mining of ETH dont use the GPU to mine, most time the use the memory to mine ETH,
And a little of the GPU,
DCR and much other currencies can be mined on the CPU of the Display card while mining ETH on the same Card