Well i've tried a couple more things. First of all I have now tried EVERY single available nvidia driver on the website and they all made bugger all difference.
Second I took delivery of a new G5 mouse (thanks overclockers). This new mouse has the option to enhance poll settings so after playing around I have this set to 1000 which does actually help a little bit on the source games.
Everything else still judders as before.
Looks like i'm now getting to the stage where my only option is getting a new card. Annoying really as I don't think i really needed to upgrade yet
Second I took delivery of a new G5 mouse (thanks overclockers). This new mouse has the option to enhance poll settings so after playing around I have this set to 1000 which does actually help a little bit on the source games.
Everything else still judders as before.
Looks like i'm now getting to the stage where my only option is getting a new card. Annoying really as I don't think i really needed to upgrade yet