geforce now on imac blurry screen

[Phantom_35]

ive been using geforce now founders for about a month now on my old imac 2008 (which still runs well) but whatever game iplay and whatever settings i do, on my imac, on geforce now or even on the game the screen is always super blury like its on a lower resolutuon

 

ive looked on th nvidia forums too and ther seems to be a bunch of other people with the same problem but no ones come up with a solution

 

pls help