Originally Posted by
GrumpyDiver
If you look at the D800 manual; the fastest approved Lexar card is the 600x Professional UDMA; so you are on your own wth the 1000X card. The Sandisk Extreme Pro is 600x. I'm shooting the Sandisk Extreme (400X) in my D800 and am fine with it. The higher speed cards are not something I was willing to pay for at this time, and the slower card is fine. Mostly this affects me only when I download images to the computer; I haven't run into a buffering issue while shooting yet.
The one thing that you do need to do is have USB3 capabilities on your computer and on top of having a USB3 card reader. In my case I installed an add-on USB3 card and my motherboard does not have native support. I haven't bothered with a USB3 card reader yet and do a direct connection to USB3 computer port using the port on the camera to download the files. It takes a bit of time for the camera and Adobe Bridge to set up a connection, but after that things move along quite nicely. Somehow my card reader is a bit hit and miss with CF card, so I'm not using it.