high end PCIE graphic cards all can be in 4 way GRAID max (GRAID is Parallax SLI/CF) XH is have 2 XM GPUs in one die, so still 4 way able XL and XM are 2 slot, 31cm long and have 4GB 512bit memory to be 4K ready XH is 4 slot, 36cm long + 2cm extra width and have 8GB of 512bit memory XL is 6+8pin for 320€ XM is 8+8pin for 450€ XH is 8+8+8pin for 1100€