The Unofficial 6GB RAM in 2009 MacBook White?
It officially supports 4GB RAM. Previous MacBooks that officially support 4GB have been found to actually work with 6GB.
But I'm wondering if Apple may have blocked this for the latest model. They do seem to be actively blocking 6GB in the 2009 mini as it can really only take 4GB, while using (nearly) identical hardware to the Late 2008 MacBook Aluminum (also officially 4GB, but actually can take 6GB).
I don't quite trust info from RAM sellers as everybody seems to be confused about the existence of this model -- thinking the plastic MacBooks have all been replaced by the aluminum ones...