As I just explained, THERE IS NO DIFFERENCE FROM PCI 2.1 TO 2.2 as far as the bus implementation goes. 2.2 just defines identification values for new card types - like WLAN - and rephrases a handful of paragraphs to make them clearer. That's all there is to it. The rest is just clueless sales and support people wasting people's time - or trying to trick them into buying new gear.