Apparently I had this crappier Bios version (1240 MHz) of the Quadro P3000 on my card which I've been using in my Zbook 17 G2 (replaced K3100).
Stumbling on this thread, out of curiousity I tried this 86.04.70.00.1B Dell version from your post, and loo and behold, now my card is utilizing the full 100W the slot can deliver.
However, it is now boosting to a whopping 1746 MHz, and not only to 1493, as indicated in the GPU-Z readout.
I don't mind that at all, temps with max. 75°C are well within sound range, but I was wondering why the huge boost difference?
Is that a false readout, or can anyone explain a bit further?