There is a serious lack of rig porn on this forum! I just spent a few hours getting one of my stubborn R9 290 cards up and running. Ended up having to make a custom BIOS for it to get it to stop crashing the drivers or whole computer, but at least this rig is back to 5 cards! Will move it back to the mining building tomorrow if it stays stable.
5x Sapphire R9 290 Reference Cards
ASRock H81 Pro BTC Motherboard
2x PSU (Antec 1300W Plat and Corsair HX850 Gold)
Some 2x1s, cheap metal racks, glue and screws
Total cost... I don't remember, they've paid themselves off several times tho!
Let's see your rig! Nothing too shameful to post - those 6 card rigs haphazardly arranged on your desk are just as good =p.