Fluca, its becasue Quadros running on lower frequency as normal Gamer cards. the 28x very, very power hungry, and if change for say 560Ti - 580 you get much more faster results. try do some calculations and you realize that just swaping for new card will save you a LOT of money for power bill.
just form head, in one year you save for new 580 card.......
again read a bit here on forum. Quadros are good, but for specific areas, to be specific, say you have CAD model of a car, and you need that ALL trangles are drawn correctly. gamer card can do it for 99,4 % but someone need to have 100 % so they buy Quadro. Quadros are mostly specialized ( just in drivers, hardware side, its the S A M E stuff as gamer card ) to draw lines and wires fast and preciously. you pay premium for good rivers and support, nothing more....... and they are clocked down, we can modify gamer cards with better cooling, overclock it and etc. and i can have 4-6 gamer cards for price of one Quadro, SAME hw inside !!!!!!!
http://www.cgchannel.com/2013/11/group-test-amd-and-nvidia-professional-gpus-2013/