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i want to replace the RAM of a A1269 from 2010. I already unsoldered the old chips. I want to replace them with some chips soldered on a ddr3 sodimm ram stick. Are there any restrictions (except of frequency) or can I just take any RAM?
No you must use same RAM chips as what this board model was shipped with originally. RAM chips must match SPD profile stored in EFI. A given board can come with a few different chips model, correct profile is selected with RAMCFG strapping resistors.
Anyway not sure why you're trying to replace RAM chips but it's most likely a waste of time.
Maybe some context is needed:
When I received the MacBook it failed to start (3x beeping) so I decided to reflow the RAM chips (because it also crashed on Memory Test).
After reflowing it started but threw kernel panic after some minutes. So I decided to remove the RAM chips. Now I found some chips of the same type and i will try to reball them and put them on the board.