Yeah, I don't see the 4 x 480. While AMD seems to have gotten the Poltergeists outta CF support w/ 2 cards ... more than that has always been a bit of an adventure. On top of that, multi card performance just hasn't been all that impressive for either side even w/ two cards. Can't really say why just yet ... have to wonder if nVidia is sitting on SLI tweaks at present as the impact of good SLI performance on the 1070 will only affect the sales of 1 card ... the much more profitable 1080.
Also, the MSI 480 Gaming draws 200 watts per card during gaming ... 850 watter isn't going to cut it. The 1080 Ti is gonna drop any day now and with what 4 x 480s will cost, I think the money will be better spent there. OTOH, with 4 x 480s, ya can turn off the heat in winter
What resolution ?