Question can't find answer to. Any help appreciated. I want to take memory out of one Dell 4600 and use both sticks in dell 4500. Currently memory is similar with the speeds different. So, can I use the 2 - 256MB PC2700 333 MHz and replace them with the 1 - 256MB PC2100 266 MHz that is currently in my Dell 4500. Dell 4600 will no longer be used, but I would like to utilize the memory. Can't find any answers on using existing (not new) memory. Looking to upgrade with spare parts. Any reason this won't work? Thanks