Gearing up to do my G4 cube build, got a shell of one, everything but the hardware itself. Great condition other than a chip on the top corner. My only concern is the PSU, I'm planning on getting a 150-160w picopsu but since that won't be enough for the GPU as well, I'm trying to see if there's a GPU only power supply. External AC to DC converter and then a DC to DC converter inside of it maybe? Is there anything like this? Thanks!