I am building a computer for a friend and I know that this motherboards max mem is 256......What i need to know is if it supports the dual-channel feature......It has 2 slots for mem and it had 2X64mb in it to start.....I just a little cheaper to get a 256 Chip instead of 2X128's.....So how bout it?how do i know if it's dual-channel?.....thanks alot!