I have mac mini 1.1 with 1.5 single core CPU in it. I was planning to upgrade to Core 2 Duo T7200 and from 512 to 2Gb ram. Do I have to flash EFI if I upgrade 2Gb and that processor or that flash is only if you want more than 2Gb ram ?

I have mac mini 1.1 with 1.5 single core CPU in it. I was planning to upgrade to Core 2 Duo T7200 and from 512 to 2Gb ram. Do I have to flash EFI if I upgrade 2Gb and that processor or that flash is only if you want more than 2Gb ram ?