I have 6 MSI 7950s (TF3). They get me just under 670 Kh/sec while undervolted to 1087 mV. I can push them a little bit higher if I run at stock voltages, but the increase in power consumption isn’t worth it.

I built a couple of these rigs about 2 months ago and highly recommend this guide:

http://www.cryptobadger.com/build-your-own-litecoin-mining-rig/

As a few others have said, the 7950 really is the best GPU for mining currently, and $4K is enough to get you three complete rigs (about 6000 Kh/sec).

Hey guys,

I built my own mining rigs (2 of them) following [url=http://www.cryptobadger.com/build-your-own-litecoin-mining-rig/]this guide[/url] about two months ago. I started mining Feathercoin when it took off, made a little bit on money on it, and I still devote a GPU to FTC. Just discovered this forum & hoping to get some insight as to whether FTC will ever be worth mining again!