Historically speaking, nVidia has always produced an order of magnitude more GPUs than AMD. And this time, I wouldn't be surprised it is two orders of magnitude, considering nVidia has the China market cornered (they're effectively a monopoly there).
Also, the usual reminder: the DYI is very vocal, but a minority still. Most of the sales are combined laptop, OEMs, SIs and DYI, out of which, I'd be surprised if it's single digits even.
On the other hand: as long as AMD is selling everything they're producing in the markets they're targeting, they'll grow. The thing is: long term, nVidia may not be worried about AMD outselling them in DYI*, but they'll be scared and start worrying if they encrouch in the bigger markets like OEM (think Dell, HP, etc) and Laptop. SIs, while not much bigger than DYI, AMD at least has a decent presence there.
Well, those are my thoughts.
Regards.