This is more of a question for my general knowledge, but I always wanted to know the difference between the gaming and professional graphics cards. I used to work for an HVAC company in the IT department and had ordered 2 new PCs for the CAD guys. They requested a certain graphics card that at the time was $700+, but the gaming equivilent was around $300. I see there are GTX equivalent "Professional Cards" that run twice the cost. Could someone elaborate on the difference?