I got a free IBM netfinity 3500. It old and slow but works. It has 192mb SDram with 1 p2 333 and a SCSI 4.3gb harddrive. I want to know, to add a second CPU(yes it is dual slot 1 LX motherboard) do the stepping codeds have to be the same I can not seem to find a match the to one I have. I can get a second one for $10.00 Also can celerons be used in dual slot motherboards. I have 2 cel 333 that are the same stepping but It will not post when I put the 2 in. I flashed the bios with the most current IBM has.