Question: Does the way a packet is built up affect the speed of a transfer. E.g. If I wanted to transfer a frame of video data from 1 area of VRAM to another - If I considered a 'line' to be 1 pixel, a pack to be a line and a packet to be a frame - would this be slower (or faster) than choosing a video line to be a 'line', a pack to be a frame and the packet holding 1 pack. Or is there no difference at all between either methods ? :

Answer: The overhead of each packet transfer is about 18 cycles. You do want to transfer a whole block of data at a time instead of breaking them up into small transfers if you wish to have better performance.