I am running 4 7970s on one 890FXA-GD70 board with one HCP-1200 PS. Using BAMT and cgminer, and really the hashrates aren't that great. About 630 m/h at 1200 core/1050 memory. I'd like to see them get closer to 680 each, but I'm not sure what else to try short of diablo to get them up, and bamt isn't really set up for that. However, that's not really the main point of this post.
My main question is -- is it a bad idea to run 4 of these cards on on one Antec HCP-1200 PS? The PS is a 1200W, and I'm running pretty close to that. Killawat bounces between 1060ish and 1140. I'm not super excited about running the PS so close to the max, but it's a solid PS, so it should be able to handle it. If I could undervolt better in linux, this problem would be solved, but I don't think there's a way to undervolt 7970s yet in linux.
Does anyone have any opinions on whether it's ok to run all 4 of these cards on the one power supply, close to the max? Safety is really my first concern, as I don't want anything to ignite.