As shown on this photo, Apple chose to use a single 1 GB RAM module instead of 2 modules of 512 MB each. If this is a good news for owners willing to upgrade their Mac mini to 2 GB, leaving a single RAM module installed will degrade graphical performance of the GeForce 9400M as the chipset will not be able to use double channel shared memory. By adding a second RAM module, the shared memory allocated to the GF 9400M shift from 128 MB to 256 MB.
So, if you planned to add more RAM in your Mac mini, and wanted to go for the entry level model with 1 GB, then rather purchase the model with 2 GB, and then add an additional 2 GB module to boost performance, the price difference is minimal. It could even sometimes be cheaper to buy the 1 GB model than replace the single RAM module with 2 modules of 2 GB each.
