Yeah, about oom it doesn't happen to me. I am using 737, 777, vector (not all option are checked), global, asn, flytampa, flightbeam,fsdt.
2048 res, ultra water, custom ai traffic, 2m mesh, shadows on high. I get av mid 20fps with 6600k,16gb ram and 7870 amd
It depends on your settings. I know lot of people are using ftx norcal and other ftx region and the will mostly get oom. If you fly tubed liners all that ftx region are not important.