@ infa :
that was exact my problem.
But I though PCIe goes through NB.
I had to clock down the memory. Now I a waiting for response from OCZ cause my mem should work @ 1600 ... but when I clock my RAMs to 1600 it´s only a matter of time till nvlddmkm.sys quits.... it recovers a few times but over the time I´ll get a bsd.