TUAW reports that hardware parts vendor Other World Computer discovered that a newer version of the EFI, when combined with an updated Boot ROM, would let the computer use the full 8 GB of RAM without slowdowns or crashes.

Previous tests by Other World Computer revealed that these older Macs could accept 8 GB of RAM, but would come to screeching halt when an application tried to use the full 8 GB. The optimal RAM was assumed to be 6 GB according to tests by OWC. Despite this presumed limitation, reports circulating on the internet continued to suggest the older MacBook models could effectively use 8 GB of RAM with Snow Leopard.

  Some 2008 MacBooks, MacBook Pros can accept 8 GB of RAM