~$1550 rig (no case), 700w, 1600khash/s (1500 WU)

[jumpmanjay]

MSI 970A-G43 Motherboard
AMD Sempron 145
4GB RAM
4x GIGABYTE GV-R927OC-2GD R9 270
EVGA SuperNOVA 1000G2
500GB HD
Windows 8.1 Pro

http://secure.newegg.com/WishList/PublicWishDetail.aspx?WishListNumber=24947226

4x powered PCIe risers:
http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313.TR2.TRC1.A0.Xusb3+pci+express+riser&_nkw=usb3+pci+express+riser&_sacat=0&_from=R40

This is all without a case. Recommended to not put this all in a regular case, but to spread the GPUs out. I made some ghetto-fabulous case while my openrigs case arrives. The cards are about 5" apart and am getting <70*C in an open area (not even using a box fan). 1600+ khash/s and pulling 630-700w from the wall. Seems like a solid, efficient build if anyone was looking for some ideas.