Just been doing a test and I'm getting nothing like the buffer Nikon state. 14 bit lossless compressed RAW I'm getting low 20's, 12 bit lossless compressed I'm getting mid 30's, that's some way off the 51 and 170 stated by Nikon. This is writing RAW only to the XQD with no SD card. Admittedly I'm not using the fastest Sony, I have the Lexar 1400x 210mb/s, and the Sony M series R 440mb/s, W 150mb/s. Using the battery grip an 9fps it reduces slightly further still. Does anyone know what cards Nikon state these big buffer figures are tested with? For some reason I had it in my head that it was the M-series Sony and not the fast G-series.
Don't get me wrong, a mid 30's buffer is enough for me but I don't get why I'm not getting the performance I thought. I used MF to rule out AF interfering, and have active d-lighting, vignette control etc etc turned off.
Edit: Just seen in the manual that those figures are obtained with the G-series card. I'm surprised the card can make that much difference to the buffer, changing 12-bit from mid 30's to roughly 170
I can't wait until Lexar start shipping cards again. Latest date is June.