Compressed modes chart

Below is a table that shows the possible resolutions and framerates for the webcams. On the left, all physical resolutions generated by the webcams are listed; at the top, the various framerates.

If a cell is blank, it means the combination of resolution and framerate is not supported. A green cell means the combination is supported uncompressed; a red cell indicates that combination is only available in compressed mode.

Size PCA 645/646 & VC010   PCVC 675/680/690   PCVC 730/740
3.75 5 7.5 10 12 15 20 24 5 10 15 20 25 30 5 10 15 20 25 30
sQCIF
128x96
                                       
QSIF
160x120
                                       
QCIF
176x144
                                       
SIF
320x240
                                       
CIF
352x288
                                       
VGA
640x480
                                       

VGA resolutions are indeed limited to 15 fps: there isn't enough bandwidth available on the USB bus to squeeze through more, even with compression.