Heh, after the joke you're supposed to put the real answer. It will actually implode causing your cd/dvd-roms to suck inside your case. OR it will be fine as long as you make sure both sticks conform to the right specification. As in your motherboard supports PC2100 RAM, make sure both sticks are PC2100 or more. PC2700, PC3200, etc are all backwards compatible and will run at the slower speeds automatically. Sometimes you will get a stick that doesnt play nice backwards, but doesn't happen too often.