Ian - I think some have missed the point...
I don't think anyone has missed the point.
PC Vendors have been making machines which has the new capacity for years now. We are not talking about high-end mid-range systems, but regular old SUN PC platforms had this capacity for awhile.
Many of the other vendors got out of the 8 socket PC market (i.e. HP, Dell, IBM, NCR, etc.) when proprietary CPU vendors started announcing dual-core... and SUN entered into that market to take up the slack for the lack of desire to retain the engineering capability during the post-year-2000 financial challenge years.
Making memory chips a little bigger does not mean vendors should exit the market of trying to avoid I/O bottlenecks for applications.
For some vendors, like SUN, it means providing a PC with 512 Gig or 1 Terabyte of RAM while other vendors are providing 288 Gig.