I have an SB80DX. I'm sure when I put it on the D200 it would detect it (show the bolt symbol in the viewfinder). I could also have sworn that I used the camera in either A or P mode & got decent results.
But when I put it on the D800 I didn't get any connection symbol. It triggered, but it was generally way over exposed. Eventually I put the D800 in manual, set the ISO to the flash & speed to 1/320X. But in A mode I got awful results as well.
Before any smart asses tell me to update - it's not happening immediately. I generally use flash for family snapshots & a bit of outdoor fill flash, so it's not much used.
I tried the built-in flash but found it underexposed.