Guide

SO-DIMM vs Soldered RAM: Is Laptop RAM Soldered?

Last reviewed 10/6/2026

SO-DIMM RAM is a removable memory stick, so it is never soldered and can usually be upgraded. Soldered RAM (typically LPDDR) is fixed to the motherboard, so it cannot be upgraded.

Which one a laptop uses depends on the exact model, and sometimes on the configuration. Some laptops mix both: a soldered baseline plus one SO-DIMM slot.

SO-DIMM vs soldered RAM at a glance
	SO-DIMM	Soldered (onboard)
Removable	Yes, a stick in a slot	No, chips fixed to the board
Upgradeable	Yes, up to the model's maximum	No, capacity is fixed at purchase
Typical memory type	DDR4 or DDR5	LPDDR4X, LPDDR5 or LPDDR5X (some use soldered DDR)
Space and thickness	Needs room for the slot	Thinner and lighter designs
Repair	Replace the stick	A memory fault usually means a board repair
Usually found in	Business, workstation and many gaming laptops	Ultrabooks, thin-and-light laptops, Apple Silicon Macs

SO-DIMM

SO-DIMM (Small Outline Dual In-line Memory Module) is a removable memory stick that clicks into a slot on the laptop's motherboard, similar to a desktop DIMM but smaller. It can be removed or replaced with a screwdriver to open the access panel, which is what makes a RAM upgrade possible after purchase.

Soldered (onboard) memory

Memory chips attached directly to the motherboard during manufacturing. This allows thinner designs and can slightly improve power efficiency, but the installed capacity is permanent. There is no user upgrade path, and a memory failure typically means replacing the whole board.

CAMM2: a newer removable alternative

Some newer laptops use CAMM2 (Compression Attached Memory Module) or the LPDDR-based LPCAMM2, a flat single module that replaces a pair of SO-DIMMs. It is still removable and user-serviceable in laptops that support it, so it is not the same as soldered memory.

How to check yours

The most reliable source is the manufacturer's specification page or maintenance manual for your exact model. It says whether memory is onboard (soldered) or lists SO-DIMM slots. Each model's RAM upgrade page on LaptopCompat gives that answer with its source link.

Find your exact model first (see the guide on how to check your laptop model), then open its specification page.
Look at the memory line. "Onboard", "soldered", LPDDR5 or LPDDR5X normally means it cannot be upgraded (LPCAMM2 is a removable exception). "SO-DIMM", "DDR4 SO-DIMM" or "DDR5 SO-DIMM" means removable modules.
On Windows, open Task Manager → Performance → Memory. "Slots used" and "Form factor: SODIMM" point to removable modules; soldered memory often shows no form factor or "Row of chips". Treat this as a hint and confirm it against the spec sheet.
Check whether the maker lists slots separately from onboard memory: a laptop can have 8 GB soldered plus one free SO-DIMM slot, so the answer can depend on the configuration.
Apple Silicon Macs use unified memory built into the chip package, which is not user-upgradeable.

Why manufacturers choose one over the other

Ultra-thin and fanless designs often favour soldered memory to save the vertical space a SO-DIMM slot needs. Business and workstation-class laptops more often keep SO-DIMM slots so IT departments can upgrade and repair them over the device's service life.

Frequently asked questions

Is SO-DIMM RAM soldered?

No. SO-DIMM RAM is a removable memory stick that fits into a slot, so it is never soldered to the motherboard.

What is the difference between SO-DIMM and soldered RAM?

SO-DIMM is a removable stick you can replace or add to, while soldered RAM is fixed to the motherboard and cannot be upgraded. Soldered memory is usually LPDDR and allows thinner laptops.

Can I upgrade soldered RAM?

No. Soldered RAM is permanently attached to the motherboard, so the capacity you buy is the capacity you keep. Some laptops pair a soldered baseline with one SO-DIMM slot, which can be upgraded.

How do I know if my laptop has SO-DIMM or soldered RAM?

Check the manufacturer's specification page for your exact model: it lists SO-DIMM slots or states that memory is onboard. On Windows, Task Manager → Performance → Memory shows the form factor as a hint.

Is LPDDR5 RAM always soldered?

Almost always. LPDDR5 and LPDDR5X are normally soldered to the board, with LPCAMM2 modules as a removable exception in the few laptops that support them.

SO-DIMM vs soldered in our database

Of 325 laptops where we know the memory design, 145 have soldered RAM, 179 have removable slots only and 1 mix a soldered baseline with a slot.

Soldered RAM examples

MacBook Air (13-inch, M5, 2026) — Unified Memory (LPDDR5) soldered, not upgradeable
ASUS ROG Zephyrus G14 (2026) (GU405) — LPDDR5X-8533 soldered, not upgradeable

Removable SO-DIMM / slot examples

Framework Laptop 13 Pro (Intel Core Ultra Series 3) — removable, LPCAMM2 LPDDR5X, up to 64 GB
HP Omen Max 16 (2025) — 2 slots, DDR5-5600, up to 64 GB

Soldered plus a slot examples

ASUS Vivobook Pro 16X OLED (N7601) — 16 GB soldered plus 1 slot, up to 32 GB

Laptops with user-upgradeable RAM

Verified examples from our database (highest supported memory per brand):

Explore nextLaptop memory reportSee the real DDR5 / soldered / max-RAM numbers across our verified laptop database.

More guides

How to Know if Your Laptop's RAM Is UpgradeableHow to tell whether a laptop's memory is soldered, partially upgradeable, or fully user-accessible before buying RAM.DDR4 vs. DDR5 Laptop RAMThe practical differences between DDR4 and DDR5 laptop memory, and why they aren't interchangeable.How to Check How Much RAM Your Laptop Can SupportWindows and macOS only show the RAM you have now. Find the maximum your exact laptop supports, how many slots it has and what type of memory fits.

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