Well im currently using 64-bit at 32 GB ram, doesn't crash for me. by large scale I mean a whole planet subdivided and refined over and over. shame it doesn't let you use a console of sorts to write a routine to process tiles. im thinking of buying geocontrol2 to refine terrain and create more unique landscapes but im not sure if can handle large altitude variances or work with large swathes of landscape, if not I might have to subdivide a planet into thousands of calibrated tiles (kina lazy but if its a must) and again im not sure if it can do batches.