The specs I was able to quickly find say that Nvidia card can use up to 2gb of your ram. So if your computer has 8gb system ram, then only 6gb is actually usable by your programs.
The answer to your question of 'is it sufficient' depends on many factors. Number one, which software? Number two, how complex is the work you plan to do? The more models you will use, and the more complex those models are, the more processing power you'll require.