another problem is what if i buy 3. 390x
how scaling 3x vs 2x crossfire setup? is my 1200 watt supply enough?
my mainboard is 8x 8x 4x pce for 3 card.
Just stick with 1 GPU on the x16 bus. x8 is a waste, anything lower is pointless.
You want 2 x16 if you plan to use bridgeless CrossFire and the GPU to their full potential.