The last memory upgrade on my machine I was told by the shop that mixing DDR PC2100 (266Mhz) and DDR PC2700 (333Mhz) would not be a problem ........ It seems OK, but does anyone know if the 333Mhz then only runs at 266Mhz ????
BTW: I now have 896 Mbyte of RAM and would definetly say that its the cheapest way of gaining performance.
(RL supplies selling PC2700 DDR 512Mbyte for £42inc ).