"Older, single-threaded, 32-bit applications benefit very little from large expansions of system memory when only one application is running. We know from previous benchmarks and articles that 32-bit games running in 64-bit environments don't benefit much (sometimes at all) from system memory sizes above 4 GB, at least not in terms of frames per second."
http://www.tomshardware.com/reviews/...de,2778-8.html
I have 4 gig. I once put in another 4 to make 8gig and benchmarked the black death track... it made no difference.
I'll stick with 4gig