Nvidia or Ati

About nVidia 

Nvidia is a GPU (graphics processing unit) and motherboard chipset manufacturer based in Santa Clara, California (US). It was founded in 1993 and since then became one of the leaders in gaming and professional graphics. Nvidia was the first to introduce a graphics card with on-board transform and lighting (T&L) - the Geforce 256 - in 1999. The GeForce brand became highly popular and with the exception of FX series these cards have always been some of the best on the home graphics market. The popular gaming console Playstation 3 also uses Nvidia graphics.

In February 2008 Nvidia acquired Ageia Technologies and started integrating their physics engine, the PhysX into Geforce cards. All Geforce 8 cards and above now support PhysX hardware acceleration for PhysX-enabled games.

About AMD / ATI 

ATI was a major designer and manufacturer of GPUs and motherboard chipsets until 2006 when it was acquired by AMD. Even though ATI no longer exists as a company, the popular brand is still being used for graphics cards (at least until 2011, when it will be discontinued).

ATI was founded in 1985, producing graphics cards for PC makers like IBM. They launched a highly popular Radeon GPU line in year 2000. After ATI's acquisition by AMD in 2006 the newly renamed AMD Graphics Product Group continued making high-end graphics cards for gaming and professional work. The popular Xbox 360 console also uses an ATI graphics chip


 p/s- for me i prefer use the nvidia coz i'm gamer n nvidia give me good performance for gaming.