I went through the same dilema with my new D800 and I have a variety of cards but not the new 800x.I can tell you that the 1000x 32GB CF card is noticibly faster than my 700x Delkin.I reviewed the specs as another poster quoted and the 800x cards only have a write speed of 45 MB/s where the 32GB 1000x have a write speed of 145 MB/s.I ended up going with 1000x 32GB Lexar and staying away from the 800 and I'm glad I did.
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