Hi i am looking to install some new RAM in a computer. It will support two 512 MB cards to make 1GB. It takes SD-RAM and DDR1 RAM cards. I have a question about the memory bus. my SD-RAM slots in my motherboard can support up to 133MHz and the DDR up to 266 MHz. If i brought a card that had higher than that, say 400MHz will it still work? will it degrade itself to 266MHz (i am buyin DDR1) I would appreciate any help.