Card speed will make zero difference. The 1D MkIII can't even make use of UDMA so it has a maximum write speed of around 15 MB/s. Any card faster than this (which is just about all of them nowadays) will not make any difference to the way the camera operates.
A fast card may increase the speed at which images transfer from the card to your computer. But, if you use USB2 that'll top out at around 30 MB/s - probably less.
So splashing out a load of cash on anything faster than 30 MB/s will be a waste of money.
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