Hi seotton; Your story (re PC533 memory types) partially checks out. I went and checked the RDRAM specs to see if 533MHz was possible. It is, but I didn't find any references to it in a quick look at the Dell site. Such a slow RDRAM system would be very bad news, but I doubt that anybody is selling one.
Until I see a real link, one showing somebody selling a system with 533MHz RDRAM, preferably referencing a 33% speed improvement over SDRAM, I will continue to think that suggestions of the existence of such a system is just FUD. Maybe someone mistook the CPU speed for the memory data rate. If someone finds me a link, I will share it with my engineering buddies, and we will laugh our heads off, it would be an exceptionally silly system.
Spec note:
Maximum Tcycle for 128Mb type Samsung RDRAM is 3.83ns. (True for all three speed grades, -600, -711, and -800.) That gives a BW/pin of 522MHz, so that 533MHz system is 11MHz within the legal minimum speed limit. At 533MHz, the overall bandwidth would be 1.066GB/sec. Compared to the 800MB/sec of PC100 SDRAM, this is indeed a 33% speed bandwidth improvement.
Specs from Samsung data sheet, page 44:
usa.samsungsemi.com
If this is true, what a joke!!! I wish it were, but I have to see the link...
-- Carl |
