Neo HD or Neo4k on CS5 when using CUDA?
 

What would be the difference in performance if you are using a new workstation with FX3800 CUDA Card/CS5? (in terms of acceleration cineform vs. if later you add neoHD)
Is neo HD improving the acceleration process even more once you have the recommended CUDA cards?
Sould I have to go Neo4k to notice any improvement? (like third party color correction realtime or other plug-ins in real time)

Thanks