You're 100% correct, the RAM wasn't on the official list of supported RAM, because if used in Dual Channel Mode with two sticks, and running as fast as it can, it simply looses data and causes crashes.

When tested one at a time the DIMMS are fine, 2 at once = whole world of errors!

Long story ...

I had some driver errors yesterday while downloading a different game, so I updated the wifi drivers as suggested elsewhere and when that didn't help I've switched over to wired internet.

This seems to have eliminated crashes in everything but factorio - which ran for much longer this time, but ...

I've just started a save from an older playthrough with fewer mods, and that's crashing in a similar fashion.

I've attached the savegame and crash dumps to this post.

So I'm in the process of moving computers, and just installed Factorio on the new one from Steam. I moved over my most recent save via dropBox because for whatever reason the steam cloud didn't want to co-operate.

Whenever I load the save on the new machine it runs for a short while - sometimes ...