I been thinking of getting a class 10 memory card cuz i'd like to load vids as fast as the internal memory of the N900 but if a class 4 has the same speed i'd just get that.

try and get a class 10 from newegg, n900 memory is still much faster at writing. I think it's about 18MB/s. But you said "load vids" which is read speed, SD card class only specifies write speed. But still, they have patriot, a-data, and other brands of class 10 16gb for around $40 now.

I think he means loading videos onto the n900 which means writing to the sd-card.