Brad has an AAR from a game with Ashes of the Singularity, and talks about some of the tech behind it in an article on Wayward Strategist.
"By the time I finally wiped out the AI opponent, I had over 8,000 units. I mainly wanted to see how far we’d come on performance. We’re doing pretty well with memory. We might be able to bring down the memory requirement to 6 GB. Video memory is still 2GB minimum. You need a 2013 or later video card. I’m playing this on a Radeon Fury. Performance remained good throughout the game but obviously I have a pretty high end system."
Read more here.... http://waywardstrategist.com/2015/12/08/brad-wardell-catches-us-up-on-the-amazing-tech-behind-ashes-of-the-singularity/