Memory

It supports SDRAM AND DDR RAM

It does not support both at the same time, so do NOT TRY, it will kill the motherboard.

it's 3GB max for the SDRAM or 2GB max for DDR.

That is what Asus say but in reality only support 1.5 gig of ddr memory.
Try any more than that you will have all kinds of problems even bios flash will not help.