I have the exact same issue, as do many others. My system exceeds recommended requirements and I have diagnosed the issue to the best of my ability with no positive results.
I can almost guarantee you that OP is having the same issue, and it isn't being caused by his RAM deficit.
If one would think logically that insufficient ram would almost never crash the video driver this way, perhaps we can actually solve this issue.
Further to what OP said, I wasn't having an issue until the Live Fire update. Also, the crashing stops if I replace my AMD gpu with an ancient pair of GTX460's sitting in my desk, which are well below minimum performance requirements. Further proving this game is not crashing due to insufficient memory of any kind but because of Driver issues.