I have an ECS board that will support both ddr and sdram. 2.26 P4. BUT, NOT at the same time. It's either one or the other. Mine has 2 slots for ddr and two slots for the sdram.
Now you can not put sdram ram cards in a ddr slot or vice versa. The guide cuts in the ram cards have to mate up with pins in the memory sockets. You force them, pins break, you power it up, and you cook ram cards.
Now you can not put sdram ram cards in a ddr slot or vice versa. The guide cuts in the ram cards have to mate up with pins in the memory sockets. You force them, pins break, you power it up, and you cook ram cards.