Will this graphics card suffice for 3d modeling and cad?

next year my engineering class is going to to use a program called autodesk inventor as well as some other 3d modeling program. im building a new computer but im trying to save some money. will a radeon hd 6770 suffice? if not will a radeon 6850? im pretty sure the 6850 will but like i said i have a budget so if a 6770 will work i can use that extra money on something else. thank you in advance