Don't use gaming cards for professional purposes. Most CAD applications have specific optimizations which are only available in the professional driver suite. Some CAD programs will bitch and whine if you do not use a professional graphics card.
I have used Firepro and prefer Quadro. AMD/ATI drivers are always buggy. BTW, Pinhedd is correct. Gaming cards don't mix with 3D modeling if for no other reason than your software tech support personnel will use the card as an excuse to not help you.
As COLGeek said, it's important to know exactly what programs you will be using before selecting a particular card. There are certain issues that arise that are program dependent. Here are a couple of examples. When using game cards with programs that rely on OpenGL the AMD cards will perform much better than nVidia cards. (It appears that nVidia has crippled the OpenGL performance to push people towards the Quadros.) When using Pro cards, certain programs have far superior anti-aliasing using the Quadro versus the FirePros while other programs have no such issues.
One thing to keep in mind concerning the Pro versus the game cards is their differing purposes. While game cards are designed mainly to provide a smooth succession of images, Pro cards have a double purpose. They not only have to render the final images, they also need to provide smooth redraws when manipulating the data in the viewports. While modern game cards actually perform fairly well when manipulating the data set, they will start to have trouble on large datasets, especially when using display modes that show detailed textures. When it comes to rendering the final image, game cards will do okay, but they tend to have issues with "roping" on long narrow highly reflective surfaces like chrome.
A lot depends on your intent. If 3D is a hobby, then it just isn't so critical, but if you're making money and trying to impress a client, it pays to get the best Pro card that you can afford and that will work best with your software. Also, what ever software you are using, it is a good idea to ask these questions in the particular software users forums to get the best advice.
I recently bought an AMD FireproV4900 graphics card, and im running it on windows 7 64 bit with sufficient RAM and processor but everytime i open a game the just screen plays back continuous black waves and cant seem to hold an image still. I tried downloading drviers and upgraded from a DVI connection to display port-HDMI but I can't figure out what i am doing wrong. Btw im using only one monitor and its an ASUS VS247. anyone have any ideas?