Hello *. Problem: As soon as 64-bit nvdia driver is used on a Opteron / Asus SK8N System with SATA disks applications get only 10 % CPU performance left KDE / Grafic performance gets down ... strange: there are a great number of NMI's showing up: NMI: 11979329 cat /proc/interrupts: 11: 1003701 XT-PIC NVidia nForce3, nvidia Model: GeForce FX 5950 Ultra IRQ: 11 Video BIOS: 04.35.20.36.00 Card Type: AGP Questions: -someone has a Asus SK8N working with hardware accelerated open gl capable agp-card ? are there other 64 bit supported opengl cards recommended ? -kernel options like noacpi or bios settings concerning agp did not change the problem anyone hints what causes the conflict ? ( irq or agp problem assumed) TIA Micha