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.
Good one!, I am running standard kingston sticks, 8GB or 12GB makes no difference, will try to lower it to 1066 and again at 1600 to see if anything changes it, did you test that? so we can confirm that system ram speed affects vtc mining?, because it is very important issue!.
thank you for the info, I will do some tests and report back here, too bad I don't have any premium ram sticks to test out, I have never ever needed it,or I will had bought some.