If you are thinking of buying a new computer, you should pay very careful attention to the graphics card recommendations for Vectorworks. If you purchase a new computer that does not match the graphics card recommendations, you will have constant trouble with the computer.
If you are thinking of upgrading your Vectorworks with your existing computer, you should also pay very careful attention to the graphics card recommendations. Upgrading your Vectorworks to a computer with a less than satisfactory graphics card will result in constant frustration.
The Vectorworks knowledge base has several articles about graphics card recommendations:
Vectorworks 2012 System Recommendations