![]() ![]() You can force full memory retraining by resetting your PRAM ( Option Command P R during boot). Although I can’t think of a good reason why it would only happen for the 4+4 case, your firmware may not be recognizing a new DIMM has been installed and is trying to use a stale memory training table with the new card. ![]() When you ran your experiment, did you try both of the DIMMs alongside the 2 GB DIMM? And then did you try each of those DIMMs in the other slot alongside the 2 GB? In other words, you should have performed this experiment with FOUR different memory configurations. Crucial Memory and SSD upgrades - 100 Compatibility Guaranteed for Apple MacBook Pro Systems - FREE US Delivery Free shipping Shop the latest deals Home Products. ![]() Exactly search with Google: Timetec Hynix IC Apple 16GB Kit (2x8GB) DDR3 PC3-8500 1066MHz memory upgrade for iMac 20 inch /21.5 inch / 24 inch / 27. I solved perfectly with 16 GB of RAM purchased from Amazon.
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