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Lars where did you source the Transcend 400x UDMA 7 cards? BH shows images of the Transcend with UDMA written on it and not UDMA 7. They are also described as being UDMA 6 cards. On Transcend's site the 64GB 400x UDMA and UDMA 7 cards share the same part number.
Are you planning to get Lexar 64GB memory cards at 800x and 1000x speeds? Based on your results of the UDMA 7 400x cards it is safe to assume that Transcend 600x and 1000x UDMA7 cards will have nearly the same number of shots for a 30 sec burst.
Amazon have the 64GB 400x UDMA 7 cards at these prices
60MB/s read & 45MB/s write Lexar $99.59
90MB/s read & 60MB/s write Transcend $103.98
With a 128GB UDMA7 card you can have these many RAWs & L JPEGs. These figures were based on what was written in each body's manual.
1D X & C - 19,200
1D4 - 22,144
5D3 - 16,160
5D2 - 19,840
7D - 18,976
1D X & C - 4,480
1D4 - 5,600
5D3 - 4,160
5D2 - 4,608
7D - 4,960
Divide by half to get how many images can be taken with a 64GB UDMA card.
Before CF5.0 spec the max capacity was 256GB.