I had my first crash too, but i was pushing it as well I have 8gb Ram, and while playing KSP at max graphics inc texture replacements etc noted earlier in my reply, I was also running alot of chrome pages, and streaming youtube vids on a second screen, I was hovering at 500-800mb system Ram free, eventually screen locked up. after reboot i just ran KSP only, and was hovering with 1.2-2gb free RAM and no crash, ran out of RAM, guess i should up it from 8 to 16, but im ok with running lean and use my laptop instead for streaming and browsing.