I have useda16GbExtreme III on my 40D for roughly 18 months now and it bogs downafteraround 7-10 shots when shooting continuous RAW.


Considering the potential write speed of the 7D (surely dual processors has a huge impact on buffer size and write speed)along with the much larger file size (comparitive to my 40D) associated with the extra megapixles I think it would be wise for fork out the extra $$$ and step into the Extreme IV.


At the end of the day you only pay for the card once - so you might as well do it right. I'd rather be a bit lighter in the pocket than miss shots. You've spent the bucks and got yourselfone of the best crop sensor cameras available- I reckon you should take full advantage of its capabilities.