Windows habits to search driver in manufacturer website killing people ability to think well.
Finally i try... and it was SO EASY to change binary driver to xf86-video-nv. Now i am completely free and can report bugs to kernel team, without being pinushed because of binary blobs (punished by myself, cause i will have to remove graphics and have to try reproduce bug in console).

Solved

Solved by removing 512+512. No idea why, but it was causing system to work unstable.

Before this RAM's was working fine.