I am still a Mac Pro newbie, although, I know a lot, I really don't know a lot. That being said, I have a few Qs. I am using an old (as in, out of my no longer used PC) Sapphire radeon HD 7950 (2x6 pin) without a flash. I have ordered an Nvidia GT 120 so that I can use the boot screen. This setup will be until budget allows a GTX 980 or 970. In my PCIe slots I have the 7950, and Plextor M6e 256 SSD. After a bit of research, I am concerned about power draw when using this setup. Any pointers or suggestions are appreciated.