Single 280X card is stable at around 7mh/s.
Raped by super fast miner + the pools(nonce-pool already there,suprnova is on the way),SPR is quite likely to die at the infant bed.
Where I can download 7 MH/s SpreadX11 miner for 280x?
Don't be stupid.
Dev has spent so much time and energy on it. Do you think they will share it for free ?

There is no miner that will make a 280x mine at 7Mh/s, the best I have heard is about ~3Mh/s so ~50% gain from the public miner.
secondly, since you are a DRK troll I will go ahead and let you know that theres software for X11 that are much better than the public miners, what do you think of that?
fyi I think this whole thing with non-public miners is stupid but this is what happens when moneys gets involved, everything is done only for profit.