To the OP or anyone else out there that has this problem: This is a MP problem only. If you are getting rof.exe errors the best thing to do is lower your settings starting with texture settings. When there's 30-40+ in the server, this is when it's more than likely to happen. To give you an idea I have an intel i7 / 480 GTX / and 12 gigs of DDR3 @1600 and I still occasionally get rof.exe error. It's more prevalent for me when a new mission loads, but it still happens occasionally. In SP this is a rarity. I know many are venturing over from the SP side to MP (which is very nice to see all the new faces), but just remember if you are getting errors like rof.exe/out of memory, just keep lowering your settings until they stop happening frequently. Then you'll be in the same boat as the rest of us

Don't fret it though. We all get em occasionally!
Cheers!