[QUOTE=Matthew12222;2162497]Cannon power shots 8 megapixel and up should be able to support atleast 4Gb cards. A650, A580 and A720 Tested well with a 4Gb SDHC but it won’t get advantage over Class 4 ultra II[/QUOTE]
And some of the 7 megapixel Canon compacts can accept SDHC cards. (My Canon SD750 is one example of a 7MP camera that’s already SDHC compatible out of the box.) Speed is another story: Most compacts simply cannot shoot fast enough (in continuous burst shooting mode) to take full advantage of even a medium-speed card (my SD750, for instance, barely takes advantage of Class 4 speeds - and only the very slowest of the Class 2 cards make the SD750’s buffer fill up more quickly than other cards, and even with the buffer completely full, the SD750 could still shoot continuously at about 1 fps).
The SanDisk Ultra II cards have become faster within the past year: The new ones are now rated at 15 MB/s (100x) speed for both reads and writes. They have replaced the 10 MB/s (66x) read/9 MB/s (60x) write cards with the same name. The new cards are, predictably, nearly as fast in both benchmarks and in real-world use as the then-133x (20 MB/s) Extreme III cards, forcing the Extreme III line to increase its speed to 30 MB/s (200x) in its SD/SDHC versions.