How to increase RAM on Xiaomi with a memory card: myths and reality

Introduction: why users want to expand RAM on Xiaomi

Xiaomi smartphone owners — especially the budget line Redmi and POCO — often face a shortage of RAM, apps close in the background, games slow down, and multitasking turns into anguish, and many people stumble upon advice to “increase RAM with a memory card” in search of a solution — but does this work in practice?

Spoiler: It is impossible to extend RAM via microSD at the physical level, but there are workarounds that allow you to optimize memory usage or create the illusion of increasing it. In this article, we will examine all available methods, from official MIUI functions to controversial root-rights “life hacks”, and explain why some “tips” from the Internet can harm your device.

Important: Before experimenting, check whether your Xiaomi model supports certain features. For example, virtual memory (RAM Expansion) is available only on devices with MIUI 12.5+ and Qualcomm Snapdragon 6xx/7xx/8xx or MediaTek Dimensity chipsets. Outdated models like Redmi 4X or Mi A1 are not available.

Myth №1: “Memory card becomes RAM” – why it’s impossible

There is a myth that microSD can be turned into RAM, just like a paging PC, and in fact RAM and storage are fundamentally different types of memory:

• 🔹 RAM is a volatile memory that operates at 1800-3200 MHz. It provides instant data access for the processor.
• 📱 microSD is a flash memory with a read/write speed of 20–100 MB/s (100–1000 times slower than RAM). RAM technically impossible.

Even if that trick worked, the performance of the device would drop dramatically. Imagine that instead of taking data from ultrafast RAM, the processor had to wait for it to load from a slow card, the result being lags, hanging and overheating.

⚠️ Note: On the Internet there are “instructions” for creating a swap file on a microSD through ADB or appendices ROEHSOFT RAM-EXPANDER. These methods do not work on Android 10+ and may result in loss of warranty or "brick" of the device (breaking firmware).

The official method: Virtual memory (RAM Expansion) in MIUI

The only legal way to “boost” Xiaomi RAM is with RAM Expansion (aka Memory Extension or Dynamic RAM), which doesn’t add physical memory, but instead reserves a portion of the built-in storage (not memory cards!) for the app cache, which allows you to keep 1-2 more apps in the background.

How to turn on:

1. Open Settings → About the phone → All the parameters.
2. Find the RAM Expansion (in Russian firmware – “RAM Extension”).
3. Select the amount of virtual memory: 1 GB, 2 GB or 3 GB (maximum depends on the model).
4. Reset the device.

The model is MIUI 12.5+ (Android 11+)

Free space in internal memory ≥ 5 GB

Snapdragon 6xx/7xx/8xxx chipset or MediaTek Dimensity

No root rights (otherwise the function may not work)-->

Important nuances:

• 📉 Performance won’t grow – virtual memory is slower than physical RAM, but helps keep more apps open.
• 🔋 Battery consumption will increase by 5-10%, as the system more often accesses the drive.
• 🚫 Does not work with microSD – the function uses only internal memory.

Alternative methods: RAM optimization without a memory card

If your model doesn’t support RAM Expansion, try these ways to free up RAM:

• 🧹 Background Clearing: Enable aggressive application closure in Settings → Annexes → Autostart. Turn off autostart for unnecessary programs.
• ⚡ Use Facebook Lite, Messenger Lite, Twitter Lite – they consume 2-3 times less RAM.
• 🔄 Reboot: Reboot your smartphone regularly (every 1-2 days) and clears the cache and frees up the “hung” memory.
• 🛠️ Disabling animations: In Settings → Special facilities → Remove animations reduce the scale of animations to 0.5x — This will reduce the load on the RAM.

For advanced users:

If you have root rights, you can edit the file /system/build.prop by adding a line:

ro.config.low_ram=true

This will force Android to optimize memory for devices with ≤2GB of RAM, even if you have more.Risk: There may be interface glitch.

💡

Before optimizing, check the actual use of RAM in Settings → About Phone → Memory Status. If free >30%, the problem is not memory, but firmware or background processes.

Controversial method: Swap file on microSD (for experienced ones only)

In theory, Xiaomi with root rights can create a swap file (similar to a paging file on a PC) on a memory card.

• ⚠️ Not supported by Android 10+ — The kernel blocks swap on flash memory.
• 🐢 Slows down the system – even a class of microSD A2 100 times slower than RAM.
• 💥 Data loss risk – frequent swap file overwriting reduces card life.

If you want to experiment (at your own risk!), the following instructions are:

1. Get root rights (for example, through Magisk).
2. Install Terminal Emulator and execute the commands: su dd if=/dev/zero of=/sdcard/swapfile bs=1M count=1024 mkswap /sdcard/swapfile swapon /sdcard/swapfile
3. Add /sdcard/swapfile swap swap defaults 0 0 to /etc/fstab.

⚠️ Note: This method has not been tested on MIUI 14+ And it can lead to a reboot cycle. On new firmware, Android ignores swap on removable media.

How to choose a memory card for Xiaomi, so that the system does not slow down

Although the memory card won't become RAM, it can help unload the internal memory, which will indirectly improve performance.

• 📁 Move the applications to SD: B Settings → Annexes → [Select an application] → Press the storage room "Move to the SD» (It does not work with all programs).
• 🎮 Save the game cache to the card: In game settings (for example, PUBG Mobile or Call of Duty, select SD data storage.
• 📷 Photo and video on the map: In camera settings → Storage set up to save on microSD.

The criteria for choosing a map for Xiaomi:

💡

Moving applications to a microSD doesn’t increase RAM, but it frees up the internal memory, which indirectly improves performance, since the system doesn’t have to constantly clean the cache.

What to do if nothing helps: upgrade or new smartphone

If your Xiaomi is slowing down even after all the optimizations, it may be time for radical measures:

• 🔧 Replacement of the motherboard: In service centers, you can change the fee to a version with a large amount of RAM (for example, with a large amount of RAM). 3/32 GB 4/64 GB. Cost: 3–7 Minus: the guarantee is lost.
• 📱 Buying a new smartphone: If you have an older model 2020 year (e.g. Redmi Note) 8 or Mi 9T), It is more reasonable to upgrade to the device with 6+ GB RAM: Budgetary options: POCO X5 (6/128 GB), Redmi Note 12 (8/128 GB).
• ⚙️ Custom firmware: Switching to LineageOS or Pixel Experience may improve memory management, but requires unlocking the bootloader and root rights.

Before buying a new device, check it against these criteria:

• 🔍 Chipset: Snapdragon 7 Gen 1 or later / MediaTek Dimensity 1080+.
• 🧠 RAM: Minimum 6 GB (optimum 8 GB for multitasking).
• 🗃️ Memory: UFS 2.2+ (faster than an eMMC).

FAQ: Frequent questions about increasing RAM on Xiaomi