I happened to have 2 capstone 1000W PS's, and I believe a 750W (all gold rated) PS from work. But I made the mistake of buying an expensive (used) ASUS Motherboard with a i7 core on ebay, which, I'm not sure was all that necessary (holds 3 GPUs). In Feb, I want to build my first real rig, and I will ask u guys questions if you don't mind about the interconnections from the GPUs to the motherboard and setups etc. Also, I will need help with the GPU software tweeks .I was looking at getting 2-3 Sapphire 7970 GPU cards next week. Electronics/hardware is my strength, I'm not that great with software though haha. I have a 80/20 frame coming from some guy that builds rigs. I really believe in the X11 arch, and I believe this is going to take off, just my opinion.....Anyway, thank you so much for all of your help, this is a great forum with great info and people! Talk soon, TUP