This question obviously is highly dependent on specific VisFX's, so please answer IN GENERAL:
In general, which GPUs/GPU families and software (Mac, Windows, Linux) COMBINATIONS are best for rendering a large variety of VisFX in realtime on a live video feed (from a tethered camera)?
I'm asking in order to choose a netbook to purchase for realtime VisFX on a live feed; netbooks are fundamentally limited in GPU/CPU power, so I want to find a GPU/software combination that works most efficiently.