So ive been planning a new build for a few weeks and looking today certain components seem to have taken a nosedive in price. The latest build I have come up with (ordering day after tomorrow (Thursday)) is this.
1) it is a serious overclockers board, it's pretty much made for LN2 benchmarking.
2) if you're getting a 650W PSU then you sure as heck aren't getting a second 4890 in there without power issues later on. and a 4890 doesn't use up 16 PCIe lanes, you could run two 4890's and they wouldn't use up all those PCIe lanes.