However, my Kingston 256Mb CF is definitely slower then my Sandisk 256Mb CF as I'm noticed during taking continuous burst shots with Canon S1.
The camera slowed down after 5-6 shots with Kingston CF, Sandisk over 10 shots still did not slow down.
My conclusion: Its hard to tell for those non-speed rated CF cards. Maybe my Kingston CF is from a lousier batch?
i think the question should be.... why do u need a high speed card? does ur cam writes very big file? like RAW? or ur dc is capable of shooting vga 30fps which usually require high speed card ...due to the need to write large files fast....