NVidia drivers problems for 9800 series

Xorg uses 30-40% of cpu. 2D performance affected. 3D works like a charm.
Tested on 3 other pcs.
2 workstation an one notebook (dell d630 NVS135M)
Affected pc:
intel quad q750
4gb ram
nv 9800gt 1gb ram 256bit

Solved it.