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. Adding OWC memory to your Mac is one of the best things you can do to extend the life, and accelerate the performance of your computer. Non-Stacked ICs: Ramjet uses a Non-stacked module for the 4GB SO-DIMM. Were adding more models as fast as we can, but if your product is not listed. They steadily ratcheted up performance but internally the devices are very similar. Choose your computer model from the list below or use the filter. From 2009 to 2012 Apple changed little about the way the 13-inch MacBook Pro was made.
Order the right RAM for your 13-inch MacBook Pro. It may be that one of your 4 GB SO-DIMMs is of marginal quality and is failing during one of the training steps. Maximum Memory: TheUnibody MacBook Late 2009 and newer have a system maximum of 8GB. So I ended up budgeting for a nice beefy RAM upgrade that maxed out this older Mac’s ability.Now let’s consider a couple of possibilities: Instead, like the 13-inch MacBook Pro, it has a combined audio in/out port. Yet this MacBook, like its aluminum predecessor, lacks FireWire. According to Apple, the mid-2009 MacBook Pro does support up to 8 GB:ĤGB (two 2GB SO-DIMMs) of 1066MHz DDR3 memory two SO-DIMM slots support up to 8GB introduced a new polycarbonate unibody plastic MacBook, classified as MacBook 6,1 (13-Inch, Late 2009) with a rubberized anti-skid bottom. Let’s consider the most common.įirst, let’s make sure your system supports 8 GB. 3 beeps + 5s pause means your memory failed training.
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