^^ Which does nothing to address the simple fact that:
A: Ramdisks are still slower then normal RAM
B: If the system needs to extend the Swap File beyond what the RAM can physically handle...[BSOD's galore].
C: 32-bit applications are still bound by their 2GB Address Space, so beyond a certain point, you will actually get diminishing [and even negative] returns due to using the (slower) Ramdisk when not needed.
D: CPu's are smart; they do background tasks during IO operations, so the inherent benifit of lower IO times actually amounts to minimal performance gains. The highest priority [active task + OS events] gets a slight boost in performance, but thats about it.
My point stands: Adding RAM beyond 4GB or so will not lead to any significant performance increases for games, because that RAM WILL NEVER BE USED. Period, end discussion. If its 32-bit, you have slightly less then 2GB to play with for any single application.