I got my K7S5A two months ago. As far as performance is concerned, i'm quite pleased under WinXP. The only problem i'm having is that my HDD (30GB Maxtor 7200rpm ATA100) scores poor rating in Sandra 2001. I'm trying to find a solution for that and i found a lot of people that had that problem too. The truth is that i don't experience a slow down in real-life performance, but those results made me quite surprised. Another suspicious thing is that voltages shown in BIOS are not precise, but this is supposed to be a problem with my generic power supply. I'd recommend using a high-quality one. Those bad voltages lead to a hang up in every warm boot (after shutting down or restarting XP hangs at the screen with the white line). After shutting the pc for about 15min everythings is fine. I'm not sure if this has something to do with my CPU temperature(42-46C), but I can't figure out another explanation for those hang-ups. As we forget about those issues the system is completely stable and doing well in performance. I noticed a 10% increase in 3DMark2001 after installing Windows XP !!! I wish you had no problems with that MB, guys...