Bro really MSI gaming edition is a real crap.MSI Gaming is also very good.. but for single card configs only. As is XFX DD. These guys use a custom cooler specifically designed for Hawaii. Asus and Gigabyte got lazy and re-used coolers designed for Gk110's larger die size.
I have no idea what Bitcoin is and tbh it just sounds like some weird fad that'll go nowhere, maybe I'm wrong, I haven't looked into it at all, however stuff that is too good to be true, always is.
Two are 1200p, one is 2000 something by 1080 (21:9) and the other is 1080p because it's my TV. I just like to run them all at the same time doing different things...
If Crossfire will give me issues I will just skip AMD and wait for Maxwell then, I had nothing but problems with it in the past, went to Nvidia with the 400 series and haven't had any experience with AMD since..