Hello, I bought my black Macbook early 2007 ( I believe that it falls under the Late 2006 category). It came with 1GB RAM and I recently upgraded it to 2GB. Also, upgraded the OS to Leopard. Foll. are the system specs: Model Name: MacBook Model Identifier: MacBook2,1 Processor Name: Intel Core 2 Duo Processor Speed: 2 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 2 GB Bus Speed: 667 MHz Boot ROM Version: MB21.00A5.B07 SMC Version (system): 1.13f3 Serial Number (system): 4H7051JSWGM Hardware UUID: 00000000-0000-1000-8000-0019E334C64C Sudden Motion Sensor: State: Enabled My question is regarding the max. RAM supported by this system (firmware). I believe it is 2GB but is there any firmware upgrade, BootROM version that I can perform that will boost the supported memory to 4 GB or so? Also, what is SMC version? Can that be upgraded and will that help? I would really like to upgrade the RAM once again and put 4GB, but I do not want to buy memory unless I know for sure that it will be supported by my notebook. Thank you in advance.