Laptop RAM vs. Desktop RAM? All You Need to Know

Last Updated/Fact Checked on May 5, 2023 by Irslan

RAM performs the critical function of providing short-term memory for a personal computer. It is mandatory on all sorts of PCs, including laptops and desktops. Although RAM performs the same duty, it is physically different in desktops and laptops. There is a significant difference in size and shape between the two RAMs. 

Laptop RAMs are smaller with SODIMM modules, while RAM in desktops is competitively bigger and possesses DIMM modules. On average, the DIMM module RAMs are 4.5″ in size, while the other is only 3″. One thing is understood, these RAMs can’t be used interchangeably. The performance is somehow comparable in terms of capacity, though.

Dual Inline Memory Module (DIMM)

Desktop computers use Dual Inline Memory Module for RAMs. Unlike a single inline memory module (SIMM) with 32-bit channels, it has 64-bit channels for data transfer. It consumes 3.3 volts of power to operate. The DIMM module contains more than one RAM installed on a single printed circuit board. This module is widely used in modern-day computers, which has obsoleted the SIMM module. 

DIMM comprises a series of dynamic random access memories (DRAM); it is responsible for primary short-term memory that continuously reads and executes stored instructions directly to the CPU. The exciting part of DIMM is the availability of connectors on both sides of the chip. Thus, the data is stored in a separate capacitor using the system bus, and the motherboard has direct access to the data.  

Small Outline Dual Inline Memory Module

SODIMM is a smaller version of DIMM, typically used in laptops. The reason for the smaller size is the enhancement of portability, and as it consumes less power, it also plays a vital role in battery timing. Unlike DIMM, it uses integrated circuits rather than printed circuits to save extra space. 

The initial versions of SODIMM had only 72 pins, allowing a maximum data transfer speed of 32-bit. However, the latest SODIMM has 144 pins with an outstanding data transmission speed of 64-bit. SODIMM is primarily used in laptops, but small form factor computers such as the HP Compaq Elite DC7900 also use this module due to its compact size.

Laptop RAM vs. Desktop RAM: Major Differences

The key distinctions are the RAM’s size, speed, and compatibility. Let us look at the significant differences between laptop and desktop RAMs. 

Size of the RAM

Size does matter in RAMs. Physically bigger RAM means enhanced data transfer speed and better performance. While desktop RAMs are usually bigger than laptop RAMs, the most common DDR4 module has around 240 pins, and those used in laptops have roughly 204 pins. 

The pin configuration is an essential factor in measuring the performance of RAM. Concerning dimensions, the desktop RAMs are about 4.5 inches in length, while others are only 3 inches. Physically bigger RAM delivers better and more seamless performance.

More Options for Upgradation

Most laptop manufacturers solder the RAM directly into the motherboard to make the notebook more compact, portable, and lightweight. It disappoints enthusiasts that can’t upgrade it once purchased. With no additional expansion slots, you are left with a basic configuration. However, very few laptops have the option of upgrading, but it will cost you the portability and compact design of the machine. 

On the other hand, desktop computers offer improved flexibility in this regard. There is always room for RAM upgrades with additional slots. The desktop motherboard usually has two DIMM slots. It is easy to use one desktop RAM in another desktop PC; the removal and installation are easy. Desktop RAMs have better upgrade options than laptop RAMs. 

Compatibility 

These RAMs are incompatible due to visible differences in modules, one using DIMM and the other using SODIMM. Besides a difference in modules, a noticeable difference in size makes it impossible to use them interchangeably.

For instance, the DDR2 memory used in laptops has 200 pins, while the one used in desktops has 240 pins. Moreover, RAMs used in notebooks are designed to run on low voltage and consume minimal power. It won’t tolerate high voltage if you somehow connect its RAM to the desktop. 

Final Words

Due to the significant difference in module type, RAMs in desktops and laptops are pretty different in size. One has 240 pins while the other has 200 pins, although the data transfer speed is the same, 64-bit. You can’t use these interchangeably as one is 4″ long and the other is 3″ long.

The reason for the smaller size is to make the board smaller and more compact, thus creating great portability. Also, the SODIMM module utilizes very little power to improve the battery life of a notebook computer. If you are looking for upgradability, desktop RAMs are the choice. 

FAQs

These are some related questions.

Can I use desktop RAM on a laptop?

Technically, yes, you can. But before opting for this option, you have to ensure that your laptop motherboard supports the desktop RAM; you can check with the manufacturer of the RAM and board to ensure compatibility. It is mandatory to ensure its compatibility before buying. 

Which RAM is more expensive?

The desktop PC’s RAM is more expensive than the notebook’s RAM. One primary reason is the competition between RAM manufacturers for home PCs. 

Can I use these RAMs interchangeably?

Unfortunately, you can’t use it interchangeably because of the difference in size and low power required for the laptop’s RAM.