Upgrading MacBook Pro mid-2009 RAM I'm trying to upgrade my MacBook's RAM to 8GB (2x4 GB), but somehow when I install the new cards I got the 3 beeps + 5 seconds pause. The 4GB cards were already working in another early 2011 MacBook.
The point being that, if I install the memory in a mid-2009 in a 2GB+4GB configuration, the Mac runs well. I have tried to switch cards and slots and it works, too.
Does anyone know what's happening?
My bad! It was a matter of the frequency.
The 4 gb cards are 1600 MHz and the max admitted by mid-2009 is 1066 MHz.
When installing 2 gb (1066 MHz) + 4 gb (1600 MHz), the macbook automatically slows down the speed of the highest to the lowest one. But if both 4 gb are installed, the Macbook gives the error. That's it.
Thank you for the advises.