Canon 1Dx - what brand and speed compact flash card(s) are you using?

Have (7) Transcend 32GB 400x cards and

(1) Lexar 32GB 1000x card.

I cannot really coment on performance because I have only had the camera a couple days and have not shot any bursts with it yet.   I probably will not use my older cards in this camera  (4 Sandisk 8GB Extreme III) cards (30Meg/sec) which are probably too slow.

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