I installed the PSU and video card with zero difficulties. If I had more money I would have opted for a modular PSU design but I was able to easily wire-tie up and stow away the unused connectors/cables. Also, the GPU gets pretty hot (~75C) using default driver's fan control so I installed MSI Afterburner and all is well. GPU never gets above 60 C now. So anyone worried like I was that an upgrade like this won't work in an XPS9000, fear no more.