Wait a minute...you're not considering shooting JPEGs with your D800, are you?
Only time I ever shoot RAW is in the second slot for weddings.
Even then, 99% or more of the time I use the Quality Priority, Large, Fine JPEGs.
At Large Events, I shoot thousands of Medium size JPEGs to greatly help my workflow.
For Landscapes I shoot Large, Fine JPEGs.
I never shoot DX, but will often crop a photo.
According to what I see in the manual and these forums,
I must have a defective D800.
It allows me to use a frame rate at 5 in any JPEG setting.