Quote from: alanlee87 on January 10, 2014, 03:18:50 AM

Quote from: phzi on January 10, 2014, 03:12:43 AM

Quote from: Shaban on January 10, 2014, 01:38:43 AM

I have 2 7970's, 1 7950, and 1 280x on a 1200 gold rated psu. It should handle them no problem, I tried upping the voltage, and I tried it in both the config file and in msi afterburner with no luck Sad

and yes, all in 16x slots - two 7970's directly connected to mobo, and the others on 16x-16x risers

Heterogeneous card configurations almost always sacrifice performance. Specifically with 3 different types of cards, you're going to be losing at least some hash rate.

Go with Homogeneous card setups (all the same brand and model, preferably the same batch), if you want to really push your machines to the limit.

So true. Also, the 7970's and 280x run "gpu-threads" : "2" while the 7950 runs "gpu-threads" : "1" so you have to run 2 instances of cgminer or you will get poor performance.

Just FYI if anyone wants to know how to do this (with BAMT) I wrote a little guide that may be useful.

https://bitcointalk.org/index.php?topic=392331

or

http://www.reddit.com/r/litecoinmining/comments/1u1s8l/dummies_guide_how_to_simultaneously_run_multiple/