Iwant to increase the sdram on my HP Pavillion 8580c.It has 128mb of sdram standard running at 100mhz. The tech sheet on the unit says there are three sockets that will accommodate three 168 pin sdram,100Mhz Intel PC unbuffered DIMMS for a total of 384mb(3x128).Everyone in town(retailers) has 133Mhz DIMMS in stock and says that there is no problem adding two 133Mhz Dimms to the 100Mhz DIMM already installed as they are backward reading and there will be no conflict.What do you think..can I safely use two new 133's with the 100 or should I hold out for 100's I'm running windows 98se at 500mhz Don