AMD or Nvidia?
Well both have there ups and downs to them. For example the AMD cards tend to be less power than the Nvidia cards. The reason for that the AMD cards tend to cost less and have more sales than Nvidia. The newest Nvidia card to drop is the the Gefore 780 TI.
The newest AMD card to drop is the AMD RadeonTM R9 series graphics which is many types of cards which also promote the new game from EA Battlefield 4.
Both Nvidia and AMD both have these technologies with fancy names for example on Nvidia it's G-Sync:
NVIDIA G-SYNC monitors feature revolutionary NVIDIA technology that eliminates screen tearing, reduces VSync input lag, and enhances the capabilities of existing monitor panels, resulting in the smoothest, fastest, most responsive gaming experience ever seen. The result: scenes appear instantly. Objects are sharper. Game play is smoother. Every time.-Nvidia
AMD also has some names for there products as well such as AMD CrossFire.
AMD CrossFireTM technology is the ultimate multi-GPU performance gaming platform. Unlocking game-dominating power, AMD CrossFireTM harnesses the power of two or more discrete graphics cards working in parallel to dramatically improve gaming performance.1 With AMD CrossFireTM-certified AMD RadeonTM HD graphics cards ready for practically every budget and the flexibility to combine two, three or four GPUs, AMD CrossFireTM is the perfect multi-GPU solution for those who demand the best.-AMD
Now many people are thinking why put this subject in gaming becuase let's face it that is all we use the cards for and that is also what the two companies are aiming for. If you ask anyone what is a graphics they would say, "What's that some new Apple product." This is why this is under gaming!