What is RAM and ROM in smartphones

by Romeo Calvo - March 21, 2021

NowInquire article on What is RAM and ROM in Smartphone

The most common specs we always consider when buying a smartphone are the RAM and ROM because we know that it has something to do with the speed of your phone and the storage capacity of it to store data like images, videos, music, documents and applications data. But most of us don’t really know how it really works.

I will explain how these 2 really work and what are the benefits of having a higher number of them. And I will also give you the list of smartphones with the best RAM and ROM that we have on Now Inquire.


It stands for Random Access Memory, a rapid device that reads and writes data in almost at the same time and it only stores temporary information and data will be lost when the power is turned off that is why it is called volatile.


It stands for Read Only Memory, a data storage device that keeps the saved data even in the event of power failure or if the phone is turned off that is why it is called non-volatile.

How it works

Now that we know the concept of these two components, let us try to relate it in real life. Think of a RAM like a table and your ROM like a cabinet.

  • It is faster to get things on the table than it is to get things in the cabinet.
  • When you open the phone, it will get the operating system (OS) in the cabinet and place it on the table.
  • When you open an app, it will get the application data in the cabinet and place it on the table.
  • When you are bored and done using the first app you open and open another app, it will be placed also on the table which allows you to switch to these apps quickly because both of them are on the table.
  • When the table is full, the app you open or currently using will close automatically or you will experience slowness.

List of Smartphones with best RAM and ROM

Asus ROG Phone 3 ZS661KS16GB512GB
Samsung Galaxy S20 Ultra 5G16GB512GB
Samsung Galaxy S21 Ultra 5G16GB512GB
Xiaomi Mi 10 Ultra16GB512GB
Huawei Mate 40 RS Porsche Design12GB512GB
Oppo Find X2 Pro12GB512GB
Samsung Galaxy Note20 Ultra 5G12GB512GB
Samsung Galaxy S20+ 5G12GB512GB
Samsung Galaxy Z Fold2 5G12GB512GB
Xiaomi Black Shark 3 Pro12GB512GB
Xiaomi Mi 10 Pro 5G12GB512GB
Xiaomi Redmi K30 Pro Zoom12GB512GB
Huawei Mate 40 Pro+12GB256GB
Oppo Ace212GB256GB
Oppo Find X212GB256GB
Oppo Find X2 Neo12GB256GB
Oppo Reno4 Pro 5G12GB256GB
Oppo Reno5 5G12GB256GB
Oppo Reno5 Pro 5G12GB256GB
Oppo Reno5 Pro+ 5G12GB256GB
Realme X3 SuperZoom12GB256GB
Realme X50 Pro 5G12GB256GB
Vivo iQOO 3 5G12GB256GB
Vivo IQOO 5 5G12GB256GB
Vivo IQOO 5 Pro 5G12GB256GB
Vivo iQOO 712GB256GB
Vivo NEX 3S 5G12GB256GB
Vivo X50 Pro+12GB256GB
vivo X60 5G12GB256GB
vivo X60 Pro 5G12GB256GB
Vivo X60 Pro+ 5G12GB256GB
Xiaomi Black Shark 312GB256GB
Xiaomi Black Shark 3S12GB256GB
Xiaomi Mi 10 5G12GB256GB
Xiaomi Mi 1112GB256GB
Xiaomi Redmi K4012GB256GB
Xiaomi Redmi K40 Pro+12GB256GB
Asus ROG Phone 3 Strix12GB128GB
Realme X50 Pro Player12GB128GB
Samsung Galaxy S20 5G12GB128GB
Samsung Galaxy S20 Ultra12GB128GB
Vivo IQOO Neo3 5G12GB128GB
Vivo IQOO Z112GB128GB
Xiaomi Redmi K30 Pro12GB128GB
Huawei Mate 40 Pro8GB512GB
Huawei Mate X28GB512GB
Huawei Mate Xs8GB512GB
Huawei P40 Pro8GB512GB
Huawei P40 Pro+8GB512GB
Samsung Galaxy Note20 Ultra8GB512GB
Samsung Galaxy S10 Lite8GB512GB
Xiaomi Redmi K30 Ultra8GB512GB
Asus Zenfone 7 Pro ZS671KS8GB256GB
Huawei Mate 30E Pro 5g8GB256GB
Huawei Mate 408GB256GB
Huawei nova 7 5G8GB256GB
Huawei nova 7 Pro 5G8GB256GB
Huawei nova 7 SE8GB256GB
Huawei nova 8 5G8GB256GB
Huawei nova 8 Pro 5G8GB256GB
Huawei P30 Pro New Edition8GB256GB
Huawei P408GB256GB
Oppo A92s8GB256GB
Oppo A93 5G8GB256GB
Oppo F178GB256GB
Oppo K7 5G8GB256GB
Oppo Reno 4 SE8GB256GB
Oppo Reno3 Pro8GB256GB
Oppo Reno4 5G8GB256GB
Oppo Reno4 Pro8GB256GB
Realme Q2 Pro8GB256GB
Realme X7 Pro8GB256GB
Samsung Galaxy M628GB256GB
Samsung Galaxy Note208GB256GB
Samsung Galaxy Note20 5G8GB256GB
Samsung Galaxy S20 FE8GB256GB
Samsung Galaxy S20 FE 5G8GB256GB
Samsung Galaxy S21 5G8GB256GB
Samsung Galaxy S21+ 5G8GB256GB
Samsung Galaxy Z Flip8GB256GB
Samsung Galaxy Z Flip 5G8GB256GB
Vivo IQOO Z1x8GB256GB
Vivo S6 5G8GB256GB
Vivo S7 5G8GB256GB
Vivo V198GB256GB
Vivo V19 Neo8GB256GB
Vivo V208GB256GB
Vivo X50 5G8GB256GB
Vivo X50 Pro8GB256GB
Vivo X51 5G8GB256GB
Xiaomi Mi 10 Lite 5G8GB256GB
Xiaomi Mi 10 Youth 5G8GB256GB
Xiaomi Mi 10T Pro 5G8GB256GB
Xiaomi Poco F2 Pro8GB256GB
Xiaomi Poco X28GB256GB
Xiaomi Redmi 10X 5G8GB256GB
Xiaomi Redmi 10X Pro 5G8GB256GB
Xiaomi Redmi K30i 5G8GB256GB
Xiaomi Redmi K30S8GB256GB
Xiaomi Redmi K40 Pro8GB256GB
Xiaomi Redmi Note 9 4G8GB256GB
Xiaomi Redmi Note 9 5G8GB256GB
Xiaomi Redmi Note 9 Pro 5G8GB256GB
Asus Zenfone 7 ZS670KS8GB128GB
Google Pixel 58GB128GB
Huawei Enjoy 20 Plus 5G8GB128GB
Huawei Enjoy 20 Pro8GB128GB
Huawei Enjoy 20 SE8GB128GB
Huawei Enjoy Z 5G8GB128GB
Huawei nova 7 SE 5G Youth8GB128GB
Huawei nova 7i8GB128GB
Huawei nova 8 SE8GB128GB
Huawei Y9a8GB128GB
Oppo A328GB128GB
Oppo A528GB128GB
Oppo A728GB128GB
Oppo A72 5G8GB128GB
Oppo A73 5G8GB128GB
Oppo A928GB128GB
Oppo A938GB128GB
Oppo F17 Pro8GB128GB
Oppo Find X2 Lite8GB128GB
Oppo Reno38GB128GB
Oppo Reno3 Youth8GB128GB
Oppo Reno48GB128GB
Oppo Reno4 F8GB128GB
Oppo Reno4 Lite8GB128GB
Oppo Reno4 Z 5G8GB128GB
Oppo Reno5 4G8GB128GB
Realme 68GB128GB
Realme 6 Pro8GB128GB
Realme 78GB128GB
Realme 7 (Global)8GB128GB
Realme 7 5G8GB128GB
Realme 7 Pro8GB128GB
Realme 7i8GB128GB
Realme Narzo 20 Pro8GB128GB
Realme Narzo 30 Pro 5G8GB128GB
Realme V15 5G8GB128GB
Realme V38GB128GB
Realme V5 5G8GB128GB
Realme X38GB128GB
Realme X50 5G8GB128GB
Realme X50m 5G8GB128GB
Realme X78GB128GB
Samsung Galaxy A Quantum8GB128GB
Samsung Galaxy A318GB128GB
Samsung Galaxy A32 5G8GB128GB
Samsung Galaxy A42 5G8GB128GB
Samsung Galaxy A51 5G8GB128GB
Samsung Galaxy A718GB128GB
Samsung Galaxy A71 5G8GB128GB
Samsung Galaxy A71 5G UW8GB128GB
Samsung Galaxy F628GB128GB
Samsung Galaxy M318GB128GB
Samsung Galaxy M31s8GB128GB
Samsung Galaxy M518GB128GB
Samsung Galaxy Note10 Lite8GB128GB
Samsung Galaxy S208GB128GB
Samsung Galaxy S20 5G UW8GB128GB
Samsung Galaxy S20+8GB128GB
Vivo IQOO U18GB128GB
Vivo iQOO U38GB128GB
Vivo S1 Prime8GB128GB
Vivo S1 Pro8GB128GB
Vivo S7e 5G8GB128GB
Vivo V20 Pro 5G8GB128GB
Vivo V20 SE8GB128GB
Vivo X508GB128GB
Vivo X50 Lite8GB128GB
Vivo X50e 5G8GB128GB
Vivo Y308GB128GB
Vivo Y508GB128GB
vivo Y51a8GB128GB
Vivo Y51s8GB128GB
Vivo Y52s8GB128GB
Vivo Y708GB128GB
Vivo Y70s8GB128GB
Vivo Y73s8GB128GB
Vivo Z5x8GB128GB
Vivo Z6 5G8GB128GB
Xiaomi Mi 10i 5G8GB128GB
Xiaomi Mi 10T 5G8GB128GB
Xiaomi Mi Note 10 Lite8GB128GB
Xiaomi Poco X38GB128GB
Xiaomi Redmi Note 9 Pro8GB128GB
Xiaomi Redmi Note 9 Pro Max8GB128GB
Apple iPhone 12 Pro6GB512GB
Apple iPhone 12 Pro Max6GB512GB
Huawei P30 lite New Edition6GB256GB
Google Pixel 4a6GB128GB
Google Pixel 4a 5G6GB128GB
Huawei Enjoy 20 5G6GB128GB
Huawei MatePad 10.46GB128GB
Huawei MatePad 10.86GB128GB
Huawei MatePad 5G6GB128GB
Huawei P40 lite6GB128GB
Huawei P40 lite 5G6GB128GB
Huawei Y8p6GB128GB
Oppo A316GB128GB
Oppo A536GB128GB
Oppo A53 5G6GB128GB
Oppo A736GB128GB
Oppo K7x6GB128GB
Realme 6S6GB128GB
Realme C176GB128GB
Realme Q26GB128GB
Samsung Galaxy A126GB128GB
Samsung Galaxy A21s6GB128GB
Samsung Galaxy A51 5G UW6GB128GB
Samsung Galaxy F416GB128GB
Samsung Galaxy M216GB128GB
Samsung Galaxy M21s6GB128GB
Samsung Galaxy M31 Prime6GB128GB
Vivo IQOO U1x6GB128GB
Vivo Y31s 5G6GB128GB
Xiaomi Mi 10T Lite 5G6GB128GB
Xiaomi Poco M26GB128GB
Xiaomi Poco M2 Pro6GB128GB
Xiaomi Poco X3 NFC6GB128GB
Xiaomi Redmi 10X 4G6GB128GB
Xiaomi Redmi 96GB128GB
Xiaomi Redmi 9A6GB128GB
Xiaomi Redmi 9T6GB128GB
Xiaomi Redmi K30 5G Racing6GB128GB
Xiaomi Redmi Note 96GB128GB
Xiaomi Redmi Note 9S6GB128GB
Apple iPhone 124GB256GB
Apple iPhone 12 mini4GB256GB
Huawei Enjoy Tablet 24GB128GB
Huawei P smart 20204GB128GB
Huawei P smart 20214GB128GB
Huawei P Smart S4GB128GB
Huawei Y7a4GB128GB
Huawei Y8s4GB128GB
Oppo A53s4GB128GB
Oppo F154GB128GB
Realme 6i4GB128GB
Realme C15 Qualcomm Edition4GB128GB
Realme Narzo4GB128GB
Realme Narzo 104GB128GB
Realme Narzo 204GB128GB
Realme Q2i4GB128GB
Vivo Y3s4GB128GB
Vivo Y514GB128GB
Xiaomi Poco M34GB128GB
Xiaomi Redmi 9 Power4GB128GB
Xiaomi Redmi 9 Prime4GB128GB
Xiaomi Redmi 9i4GB128GB
Xiaomi Redmi Note 9T4GB128GB
Huawei P40 lite E4GB64GB
Huawei Y6p4GB64GB
Huawei Y7p4GB64GB
Oppo A124GB64GB
Realme 5i4GB64GB
Realme 7i (Global)4GB64GB
Realme C154GB64GB
Realme C34GB64GB
Realme C3 (3 cameras)4GB64GB
Realme Narzo 10A4GB64GB
Realme Narzo 20A4GB64GB
Realme Narzo 30A4GB64GB
Samsung Galaxy A02s4GB64GB
Samsung Galaxy A20s4GB64GB
Samsung Galaxy A414GB64GB
Samsung Galaxy M02s4GB64GB
Samsung Galaxy M114GB64GB
Samsung Galaxy Xcover Pro4GB64GB
Vivo Y204GB64GB
Xiaomi Poco C34GB64GB
Xiaomi Redmi 9C4GB64GB
Oppo A33 (2020)4GB32GB
Vivo Y12s4GB32GB


The more RAM and ROM a smartphone has, the better experience you will have.


1. What is the difference between ram and rom in mobile?

Answer: RAM is basically like a brain that can read and write at the same time, that is why it is called super fast-type memory. ROM is a data storage device that keeps the saved data even in the event of power failure.

2. How much RAM does a phone need?

Answer: At least 4GB of RAM.

3. What is RAM used for in mobile phones?

Answer: It is responsible for how fast your phone is and handing the running applications.

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