s e n wrote...
i solved my issue with fps drop with turnin (fromnvidia console panel):
extension limit ON
threaded optimization OFF
Did you apply as global setting or as a program settting.
For those who are interested this, you start the nvidia control panel under
control panel -> Hardware and SoundUnder the 3d settings menu, select the manage 3d settings sub field.
The panel should pop up with the global settings tab selected.
Extension limit
Threaded Optimization
are both options available there....
I honestly hope that this is the issue for all you 400 series owners.