Had with my old HP computer with XP only 1GB of memory in it. Then wanted the 2 Bank equip with 1 GB. Property me then but considering both banks to re-equip. Last I then but only bought a 2GB memory, hoping that XP recognizes both banks. In the beginning it was not because I had the 2 bank used by 2 GB. When I had put the 2GB in the first place recognized XP Prof. both banks and thus I now have 3 GB of memory. Now everything is more stable and faster.