Unless you use an external PSU or do a Pixla's mod, you can't power this card. The reference model of VEGA 64, non-OC, is a 295W TDP GPU that can use more than 385.3W on short bursts. NITRO+ is an overclocked model.Is this card ok to use on a 2010 MacPro 5,1 using Mojave OS? I would guess its METAL supported but no boot screen?