There are two letters different, of which i think i've determined that the B-C stands for the 16->32gigabit upgrade and the A->M stands for the A revision->M revision. The ones i ordered are hopefully of the same series, the H9CCNNNCLTMLAR-NUD version. For your record, a partial list:įurther digging on the website turns up their 8GB model also has Hynix memory and thanks to their awesome board-photo's i can determine the model RAM on their board (i will need to open my Macbook at some point still to confirm). The manufacturer code 0x80AD translates to SK Hynix, which is fortunate because it matches the brand i've ordered my chips from. Today i did some digging. Turns out the 'About my mac' menu can tell you the RAM manufacturer. So it seems my memory might be compatible for my plans! So my chip is the H9CCNNNCLTMLAR-NUD and that translates to:ĬL - I assume 32Gb, QDP, 1Ch, 2CS (but not confirmed), 8GB is the BLĭ - Not sure yet, but related to operating temperature Besides their annual reports, catalogues and some other stuff i hit the jackpot: the LPDDR3 naming scheme! Which downloaded SK Hynix entire archive for me in a few minutes. So i've asked a friend of mine to write a little scraper: for i in do wget -content-disposition - no-clobber "$i" sleep. I suspect it might still be in their archive, just not on the website anymore. It is however incomplete: the document for LPDDR3 is missing. The SK Hynix site does have some documentation on some of their chips and how it is labeled. My chip has two different letters in it's code compared to the original Macbook RAM as shown by iFixit. Well i have a shipping notice on the RAM, but i still need to confirm everything might work. My questions now: is my reasoning correct in assuming the three chips i've mentioned will probably fit and work? Where can i obtain these chips? A testing document by Intel in which they've tested compatibility of various RAM chips for the specific CPU i'm using:Īnd with a bit of puzzling i've figured out (i think) what each of the 4 configuration settings does: Now what model of RAM should we buy? Apple provides one type in the schematic: The different options of RAM are controlled by a few GPIO lines on the CPU which are either pulled high or low with a few resistors. So this seems to be pretty straightforward. And apparently all models use 1866mhz DDR3, either by Hynix, Epida or SamsungĪnd you can configure the amount of RAM using some config-lines! So all different models of this macbook are done with the same logic board. In the schematics we're off to a promising start
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