Thanks for alle the advice. It seems thou that the problem was not my A3640 (at least not yet :-))but the order of my PCI cards. I changed the order and the problem disappeard.
From bottom up the order is:
Emty slot
Voodoo 3 3000
Soundblaster 128
D-link 530TX ethernet.
DoctorQ from DK (who helped me a lot :-) described the problem as DMA related. I think that i will eventually install a fan just in case.
No my only problem is that i can't get eternet card up an running. I will make a seperate post about that.
Once again thanks for all the help.
