I am thinking of buying an iMac at the apple refurbished store and there are two I'm currently interested in. One has an AMD Radeon HD 6750M graphics with 512MB memory, which is cheaper, while the other has a AMD Radeon HD 6770M graphics with 512MB memory . What kind of difference will the 6770M have with the 6750M.
At the moment I am using the computer for 3D models, digital paintings, mixing music, and video production.
No gaming? A 6750M and 6770M doesn't have a lot of difference, probably less than ~15% if there is any noticeable difference. If they don't have much difference at Cost, I would probably choose the 6770M since it should be generally better than the 6750.
Its your choice, if the 6770 one costs like 100$ more, then I will definitively choose the 6750 one. Since 100$ is not worth for less than 15% performance boost.