The number of reads from the texture memory is also dependent of the filtering technique used. 100 points per polygon. We can see that the when we keep the Memory bandwidth limit of 280Mb in our mind the number of polygons possible is not that high. Still 100points per triangle might be a bit much. Well the more complex the scene the more polygons are used.
More polygons means more memory access.
Higher resolution means more points, more memory access. If we remember what we have learned about the Z-Buffer than we know that the Voodoo based cards draw and calculate all polygons whether they are visible or not. This means that the card is doing a lot of unnecessary memory access. This is the main reason why the Voodoo based cards are limited to 640x480. The PowerVR cards do not have this problem and can continue accelerating even up to 1024x768.