Everyone seems to be asking questions but I just wanted to thanks to all the guru's who are providing answers and helping us. I read and re-read the info on here and I am happy to say I have 7 290x running at 463KH/s a piece, on a 8gb ram stick.

I will give out a little info to help other people regarding RAM. On this rig a friend tried adding up to 32gb of ram. He had the same results as running 8gb of RAM. What he did find out though is RAM speed made a big difference. Using 8gb of 1333mhz he was getting only lower 300KH/s. Once put in 8gb of RAM with 1866mhz he reached the current speed of 463KH/s per 290x.

So if you are upgrading your RAM (which I see quite a few people talking about in this thread) make sure you get a decent mhz. Hope this info helps someone out there.