Hi, I have currently got 512MB DDR Ram and have another module of 512MB SDR Ram, so my questions are: 1.) Is it possible to have both SDR and DDR running alongside in same machine? 2.) Would the system recognise and use both RAM modules? My spec is: P4 512MB DDR 80 Gig HD Sis 645 Motherboard OS: Win XP Professional. Thanks in advance. Daz. -- This email has been scanned by Norton Internet Security software and is virus free!