got that card last week, no problems with it so far, temps are at 75C, at 60-65 % fan, and not as noisy as they seam on most of reviews. clock 1080/1500...
OP please check BillionCoin, it has very big support from China and is growing very stable. Its price has tripled past 2 days after it is added to Chinese exchange. I expect iCoin much better than BIL.
Good luck finding a BIL pool that pays what you deserve.
The Sapphire Toxic 280x can be bios modified to lower the voltage.
how?
VBE7. I can confirm it does work on the 280x toxic as I also did it yesterday. I'm starting to wonder if most new cards can now be modified. I made this thread before I knew about doing so.