Are you maybe thinking of CPUs back when they were marketed by clock speed? Because GPU naming has always been a mess. In the mid 2000s for example you had the Nvidia Geforce 7 series with product names such as: 7800 GS, 7800 GT, 7800 GTX, 7900 GS, 7900 GT, 7900 GTX, 7900 GTO, 7900 GX2. They've been moderately consistent with "bigger numbers in the name = higher end card" but beyond that you can't tell anything meaningful without comparing the cards in a table.