Hi, been reading the OOM. threads. Still unable to get my head around the ram issue. after about 1hr into a flight i get OOM. restart FSX. Even though the resource monitor showes only 44% use. None of the fsx sliders are maxed out.I also get low frame rates.

I am surprised you get OOMS with 64bit. I upgraded to 64bit and never have had one. Even on 32bit I only got them with the PMDG aircraft. I still don't understand it in full.