i have bought a new 1gb ram chip to go with my other 1gb ram stick they are both the same speed 533mhz but when i put them both in together windows 7 only recognises 1gb stick and cpu-z only says its running in single channel mode i know the motherboard supports dual channel mode and the ram works in the slot on its own so the ram works but they dont work together and the bios says its only single channel any help would be aprreciated