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It probably depends on the web camera drivers and whether iPi DMC is enabled to take advantage of the framerate. The PS3 Eye camera, for example, has a potential framerate of 120fps but iPi has limited the framerate to 60fps because the image quality at 120fps is too grainy for accurate motion capture results.
If you're thinking about using a web-type camera other than PS3 Eye, you may be disappointed because iPi DMC is optimized to work with PS3 Eye. To make a different web camera work with iPi DMC you may have to use the camera's control panel to manage image quality and other properties of each individual camera, making the experience far more 'fiddly' and less 'plug-and-play'. (Speaking from experience with Logitech cameras.)
If you are using PS3 Eye, then yes, it actually can capture data at 60fps. The tricky part is maintaining a constant framerate with all the cameras and this depends on your hardware.
Ideally, you need a USB controller for every pair of PS3 Eye cameras, so for six cameras you need 3 controllers. You may already know this but the number of controllers you have is not the same as the number for external ports on your computer. I think most desktops have at least two USB controllers onboard; many laptops only have one or two. If you need more, you will need to add an additional USB controller card (or Expresscard in the case of a laptop.)
You will also need a very fast drive to capture from four to six cameras at this framerate, either an SSD or RAID. (I use an SSD dedicated to capture-only, and it's been the most reliable option--never a dropped frame. Avoid getting a really cheap one though.)
Optionally, you can reduce the resolution to 320 x 240 or use more compression. iPi has stated in the past that a fast framerate is more important than resolution or compression quality for getting accurate results. (Though in the case of Kinect, you're pretty much limited to 320 x 240 at 30fps, and the results are really not bad.)
Hope this helps.
G.
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