[hcc]

Does the 200x memory give a tangible speed increase over 166x? Or is the buffer going to fill up before it ever becomes a factor?
Since the 166x memory is about half the price per GB.. I'm trying to figure out if the extra speed is worth the money...

Coming back to the original post, the notion of 200x or 166x is not really hepful. You want to compare the transfer rate of cards: 10 Mb/s, 30 Mb/s.

The transfer rate of the rate is particularly important when you do use movies and Hi continuous shooting. When you shoot at 5 fps (continuously), the shot is initially stored in an in-camera buffer memory before being transfered to your SD card. If the card transfer rate is too slow, the buffer will fill up until it is full and the camera will slow down.

Similarly, when you take a video, the camera will stop to record once the buffer memory is full.

With Hi continuous shooting, you may adjust your file size to ensure that you can transfer 5 fps continuously without saturating the buffer memory. The larger the card transfer rate, the larger file size you may choose. For example, with the K-7, a JPEG file with 2 stars is about 3 Mb. At 5 fps, you need a card transfer rate larger than 15 Mb/s to prevent the buffer saturation when you take long sequences.

Hope that the comment will help....