I updated a little bit my system : Athlon XP-M 2800+ (2133 Mhz- 16*133), on an old Abit KT7a (from 2001) 1 GB of classic SDR 133Mhz (not DDR !) An ATI 9550 - 128 Mb on a Seagate Sata 7200.11 500GB plugged on a SIL 3512 sata1 PCI card. The hard drive is really faster than before : Under Vista : 95 MB/s for the sata 500GB, compared to 55 MB for the IDE 200 GB Moreover the added memory boosted the Vista SP1 refresh2, vlited. It is now really usable, not as fast as XP SP2, but quite OK ! I really think that 1 GB memory is indispensable under Vista.