I get similar reactions with my system. I only have 512Mb in my Dell 2.6 with Geforce4MX420. Has a real hard time at some airports, but runs fine at high level. I get 20FPS in clear skies, but will crash after a short flight on finals if I have VC open or GPS. I assume it's the same problem as FS9 in that the program (remembers) every thing you do in the flight and runs your pc out of virtual memory. I increased the VM to a few gigs of HD space and it's ok for light aircraft. I'm adding another 1/2gb stick and waiting for a DX10 card to see if I can still get a half decent approach on visual.
i hav a GeForce 4 MX440 AGP 8x, and
you can run fine??? wat??? >:( >:(

FSX hates me!!!!!!!!!!!!!!
FS Water Configurator+ has new modifications in the works, plus DirectX 10, Service Pack
1, and Radeon HD 3+ Series support.