Difference in memory cards?

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Question:

Is there a noticeable difference between the low cost Transcend type CF memory sticks and the high cost high speed versions such as Scandisk Extreme VI in terms of speed or picture quality when used with a Canon 40D camera?

Comments please!

[zona5101]

The Sandisk Extreme IV is very fast. I also have a medium fast card(Lexar) and a run of the mil card (Transend). In camera I can't tell the difference. All of the cards can keep up with the camera shooting raw out to about 12 frames @ 4 frames per sec. After that the buffer starts to fill up. When shooting action (sports) I typically find myself shooting for bursts of 3 to 6 frames then a pause then another burst - all the cards will keep up all day long.
Someone with a 7 or 8fps camera may notice a difference. Where I do notice a difference is downloading the images to the computer. The extreme is noticably faster...but I don't see that as a critical point in the process.
I have not experienced any data loss or card failures....yet.

[inkista]

Here. Take a look at Rob Galbraith's card performance database figures for the 40D:

Rob Galbraith DPI: Canon EOS 40D