SODIMM VS UDIMM | Difference | Comparison

Computer memory comes in two varieties: UDIMM (unbuffered dual Inline Memory Module) and SODIMM( Small Outline DIMM). Their compatibility and physical characteristics are the primary differences between the two. So let us check out the difference between SODIMM and UDIMM to better understand this topic.

What is SODIMM?

SODIMM stands for dual inline memory module. As the name suggests, SODIMMs are smaller than DIMMs. JEDEC specifies that SODIMMs have to thickness of 3.8 mm and a height of 30 mm. SDR, DDR, DDR2, DDR3, SODIMMs measured 67.6 mm in width. The DDR4 and DDR5 SODIMM measured 69.6 mm and were 2mm wider. The remaining measurements are similar to PC DIMMs, which are almost twice as wide at 133mm.

What is UDIMM?

The volatile memory chip known as an unbuffered dual inline memory module or UDIMM for simple terms, is mostly found in desktop and laptop computers. It is a standard type of RAM. A particular kind of UDIMM is modern-day DDR memory chips. With only one or two modules per memory channel. UDIMM usually outperforms RDIMM(registered dual inline memory module). 

SODIMM VS UDIMM | Difference between SODIMM and UDIMM

Memory registered status

SODIMM is registered memory, while UDIMM is Unregistered memory.

Memory module pins

SODIMM has 204-240 memory module pins, whereas UDIMM has 240 memory module pins.

Connector types supporters

Use SODIMM connector 204, while using UDIMM connector 260.

Maximum transfer rate

The maximum transfer rate of SODIMM is 14928 megabits per second, in contrast, the maximum transfer rate of UDIMM is 25600 megabits per second.

Compatibility

SODIMM is used in laptops and other small systems, whereas UDIMM is used in servers and workspace computers.

Transmission estimate

The transmission estimate of SODIMM is 800 MT/s to 1866 MT/s, but the transmission estimate of UDIMM is 1866 MT/s to 3200 MT/s.

Size

SODIMMs are physically shorter and have fewer pins than UDIMMs.

Capacity

The capacity of SODIMM is 2 GB, 4 GB, and 8 GB, whereas the capacity of UDIMM is 4GB, 8GB, and 16 GB.

Installation

SODIMM is more compatible with installation in laptops, desktops, and small form factor basis. When installing SODIMM into a laptop, they are typically titled at a 45-degree angle, but the UDIMM is the most common form factor of memory used in desktops. 

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