I hear all professional users always talking about Quadro cards. Even when I look at Boxxx workstations, they come with Quadro. But why is it that when it comes to gpu rendering, I always hear everyone saying to go with a high end gtx card instead? Even in this thread I noticed that oldguy has a quadro in his machine, but luxxeon said he's using a gtx. So what's the difference, and why are quadro's almost double the cost of most gtx cards? I'm asking because I want to get a new system for gpu rendering, and want to choose the right nvidia card to get the fastest results. If anyone has any insight or can share their own story about why they use the nvidia card they use, that would be great!