White dots / lines
During vdpau testing I was tipped about increasing the memory clock. I went to nvidia x settings, and detected optimal clock.
What happen then is that I saw screen irregularities while detecting. These seems to show up since then even when the card is not clocked. Recent driver releases etc makes overclocking not needed.
Is this due to hardware damage that I see lines / dots once in a while? It's almost never occuring on SD deinterlace, but much more on HD. So I would guess this is GPU stress.
The lines / dots can best be described as an antenna signal when you get these small snow corns here and there due to interference.
No sign of this when playing back progressive material on vdpau.