OK I did some testing: bufferpools around 500 000 000 solves this problem, however, FSX starts to develop crazy...well....x-rated errors with this after a while:

http://img4web.com/view/8FS78E


but lowering the bufferpools to 400 000 000 brings back the flashing spikes and polygons in cockpit view.

@markoz
are you telling me to fly on less details with an OCed 4 Ghz CPU and 8 Gigs of RAM?

Do I really have to consider to go for a 300 € + Video Card with around 2 GB to have everything running fine?