I just went through this with our Dell rep. The generations aren't totally successive, if you count the non-Quadro RTX 4000 series, which is Ada generation but

I just went through this with our Dell rep. The generations aren't totally successive, if you count the non-Quadro RTX 4000 series, which is Ada generation but not part of the RTX 4000 Ada series. Add to it the card variants, and there's a chance that you might still end up with the wrong part if your purchaser isn't careful.