DDR @dfi nf4 sli-dr in Processors, Motherboards and Memory Posted September 13, 2007 More than that, DDR2 ram won't fit in the socket. The position of the key slot changed between the two types. Also, a DDR socket only has 184 pins to make contact, whereas DDR2 requires a socket with 240 pins. DDR3 is also 240 pins, but again, the position of the key slot changed, so you can't accidentally mount a dimm of DDR3 in a DDR2 socket. As to would it work if it fit? No, in fact, it would kill the board. I've been a part of a force-fit test, and the board went boom.