I know one thing for sure. On my nForce4 board, with all drivers manually integrated (using OemPnpDriversPath method), I see no problems at all, everything runs stable. So it should mean, nVidia drivers are fine, maybe the DP is accidentally stumbling somewhere, or something else is conflicting. I integrated: nVidia ForceWare 81.95 nVidia nForce drivers v8.22 (which contains drivers for ethernet, SMbus, SATA/RAID, IDE) I can confirm that its fine on both, XP Home (32-bit), and XP Pro (x64).