Mark, I have a couple of boards here at home that are using DX50's (50mhz bus made it pretty speedy for it's time!)without Ziff sockets... No real problem to remove and reinsert chips..just have to take some extra care to be sure that you apply pressure evenly when removing and reinserting...ie..use the corner of a srewdriver to pry the chip up a little in each corner..then in the middle of each side...the usual precautions you would take with anything that had pins that could bend...With insertion..even pressure again though I have noticed that the chips go in more easily than they come out. DX266 is indeed a clock doubled 33mhz so bus speed remains at 33mhz Can't answer your memory question ...sorry. Best, Bob Chapel > socket....I haven't replaced one of these yet......how much or a > pain are these to upgrade? Do you just manually pull them out and > push them in....or is there a trick to it? > > of four.....can I leave 4 megs in and replace 4 with 4 meg 30 pin > simms or do some 30 pin boards require particular memory > configurations. > > Thanks > > Mark > [log in to unmask] >