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Hello everyone, today we will learn how to upgrade the memory of Apple laptops

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Ordinary Apple laptop memory upgrade is actually very simple

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For this kind of pluggable memory,

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we can directly replace a memory with a larger capacity

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In the process of replacement, some problems need to be paid attention to

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For example, the memory capacity cannot exceed the maximum memory limit supported by the chipset

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What does that mean?

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For example, Intel's sixth-generation CPU supports a maximum of 16GB

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After the upgrade, the memory cannot exceed this limit

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If it exceeds, it can only recognize up to 16GB

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DDR3 memory, DDR4 memory, and DDR5 memory, they cannot be mixed

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Try to make the memory frequency the same as the original memory

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Here's how to upgrade the memory of a regular Apple laptop

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Next, there is another type of onboard memory

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For models like A1465, A1466, and A1502,

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their memory is soldered to the mainboard

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This kind of memory upgrade is a little bit more difficult

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Because it does not support plugging and unplugging,

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when upgrading,

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you must buy 4 memory chips with a larger capacity than the original machine for replacement

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When replacing, we need to configure its memory parameters

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according to the table of CPU DRAM SPD Straps provided in the circuit diagram

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Let's take a look, the memory of the original machine is 4GB,

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if you want to upgrade to 8G,

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you can use Hynix memory or Samsung memory

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You can also use Elpida or Micron memory

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It can also be upgraded to 16GB

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If you upgrade from 4GB to 8GB,

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you need to modify the configuration according to this configuration table

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These original machines are "L", which means low level

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After the upgrade, they are still "L", so we don't care about them.

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Like this one, it used to be "L", but now it becomes "H", high level state,

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this one should be changed to high level

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We just need to search for this RAMCFG2 pin in the circuit diagram

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RAMCFG2 is in this place, there is a pull-up resistor and a pull-down resistor

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The original machine is 4GB, after changing to 8GB,

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the request in the form is changed to "L", we can install the pull-down resistor

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RAMCFG0 and RAMCFG1 must be low, and these two pull-down resistors must be installed

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For RAMCFG2 to become high level, this pull-down resistor must be removed,

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and this pull-up resistor must be installed, RAMCFG2

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The RAMCFG3 pin remains low

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The four original pins are all low, and they are all equipped with pull-down resistors

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After upgrading to 8GB memory, we only need to move the pull-down resistor to the position of the pull-up resistor

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Just move the RAMCFG2 pin and pull it up to 3.3V

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For models like A2159, its configuration table has undergone a little change

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This kind of memory only has two chips, just buy two chips and replace them.

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The combined capacity of these two chips is larger than that of the original machine,

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which is called an upgrade

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For example, the original machine is 8GB,

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if you want to upgrade to 16GB, it is still Hynix

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If we want to change, just follow this form to change

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The original 8GB is like this,

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RAMCFG4 is in low level,

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RAMCFG3 is also low, RAMCFG2, RAMCFG1 and RAMCFG0, which are all in low level

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There are a total of 5 resistors,

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if all these resistors are installed, they will all be in low level

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If it is not installed, it is pulled up to a high level by the chipset

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After removing the resistor, it defaults to high level

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If you want to upgrade to 16G, you only need to keep the four pins low,

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RAMCFG4, RAMCFG3, RAMCFG1, and RAMCFG0

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Only RAMCFG2 is not mentioned here, we will dismantle it,

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after dismantling, it will be high level

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What is not listed in this table means to remove it and keep it at a high level

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After the memory upgrade, some models need to refresh the BIOS

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Ok, here's how to upgrade the memory on an Apple laptop