I wanted to give some feedback, after a lot of research and feedback from Fullzero I would recommend to anyone that it issuing a 4-6 GPU system to use 8GB of RAM minimum instead of 4GB. I have been running my system now for 5 days and have not had any "random freezes/crashes" even with pushing some OCs in testing the new ver 0017. I think this is something we overlook.
What makes you think that there's a need for additional RAM? Top is showing that I'm not using more than about 1.2GB with four cards. I'll test this weekend on my 6 GPU system, but doubt it would use more than 2GB
I thought the same thing until I really looked into it fullzero had suggested it had to do with the possibility with the DAG and virtual memory for Linux and or Windows. Before I had random freezes, kept the same settings, added the RAM and no more issues.
Depending on the Algo ram will matter more or less.
When mining ZEC 4gb should be good.
When mining Ethash, especially Ethash + another algo when dualmining; you will have better stability with more ram.
In general; more ram less problems.