No they don't.
How ever, you can get motherboard that will take the new CPU and still keep your SDRAM investment. Asrock does one of these board.
That is the 6th time is abot 3 weeks that i have been asked this question. 3 of those times were from people should of known better.
"Everytime some one asks me if DDR Ram and SD Ram can work together, God kills a kitten. Please help save the kittens."