These are good points, but I am using a HCP-1200.  From what I understand, this power supply is designed to run pretty close to peak capacity for extended times.  I wish I could undervolt to get the power usage down a bit, but I really don't want to run windows, and linux doesn't seem to be able to undervolt 7970s yet.

Thank you.  I will look into the other exchanges you mentioned.

It has literally taken days for mtgox to process my last couple withdraws.  Several days.  For anyone trying to use bitcoin for transactions that need to go to USD, this seems totally unacceptable.  Is anyone else bothered by this?

Yes, air cooling.  I think the hashrate is too low also, but that seems to be the best I can get with BAMT/cgminer.  Not sure why it's so low.  It's annoying especially at the higher power consumption.  Hopefully BAMT will improve 7970 support soon.  I could just run it on ubuntu, but I like running everything on BAMT for the monitoring.

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.

It took me awhile to get the 7970s working.  I can't remember exactly what I did, but I'm pretty sure I updated the drivers based on info I found in the forums here.  Sorry that I can't remember more details!  I have msi 7970s.  The error I get now is just that it doesn't recognize the 5830s when the 7970s are in the machine.

Since I am forced to post in the newb section

I have a rig running with 2 7970s on a 890fxa-gd70, and I'd like to fill the other 2 slots with a couple 5830s I have sitting around.  The PS is an antec hcp-1200, so I think it can handle those 4 cards.  However, I can't seem to get bamt to recognize 58xx and 79xx cards at the same time.  It will recognize the 5830s if the 7970s are gone, and vice versa, but all together, it doesn't see the 5830s. 

Has anyone been able to make the 5 and 7 series successfully coexist in one box, preferably BAMT?  I'm just trying to maximize those open slots on the gd70s, and I'm pretty sure the power supply won't handle 4 7970s in there.