Originally Posted by Griegor Mcvennor
I'm not sure if this will help but try making your settings go all medium and set your shadow quality to off. See if that helps your crashing.
I did that with my current temp GFX card and I survived a 30 minute siege with more units than last time and didn't crash. It's possible it has somthing to do with the shadow rendering.
Thanks for the suggestion Griegor. I'm have been playing with all settings at low.