Convince a noob that Quadro cards are noraml cards with diffrent bios

Help me!

I got into an aruguemtn with some noob here:

http://www.tomshardware.com/forum/288207-31-build-workstation-gaming-parts#t2132790

HE refuses to ackknowlagege that Quadro cards and Firegl cards are just normal cards with flashed bios.

(With the excpetion of a few cards wthat have more mmeory)

I showed him sources, I gave him a list of flashed cards, flashible cards, nada.

I can't drill it through his thick skull.

Somebody please help me expalin it to him in 5 letter and smaller words.

Pretend you are talking to small child or an metally disabled person.

Thank you.