Mac pro efi firmware11/15/2023 ![]() ![]() Secondly, this reminded us of when after we were the first to qualify 2007-2009 Core 2 Duo MacBook Pro and MacBook models supporting 6GB max without experiencing a dramatic system slowdown, certain memory resellers pushed the same idea about 8GB compatibility. First, this is the first time in our recollection that an EFI update and a dot version OS update both combined to affect memory addressing. Pardon us for our initial skepticism on this larger memory capacity finding. You must be running Snow Leopard or later to address 8GB on these systems, and our testing was done with 10.6.6, which is the earliest version we’re currently supporting for this. Once you have ensured that the Boot ROM is the correct version, make sure your Operating System is updated to OSX 10.6.6. If your Boot ROM version does not match the numbers above, download the appropriate firmware updater for your model machine and install according to the instructions: If you have installed that update, your Boot ROM version will be 06. If you have this update installed, you’re already able to install the 8GB without any problems and don’t need to perform further updates to install more RAM.
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