Replacing the whole motherboard for RAM is technically possible but usually not worth it.

Technically yes, but you probably shouldn’t.

If your laptop has soldered RAM, the only way to “upgrade” it is to swap the entire motherboard for one with more RAM. That means finding a compatible board (same model, different RAM configuration) on eBay or a parts supplier, then doing a full teardown. It’s possible, just like it’s possible to rebuild an engine in your driveway.

But it’s expensive — often $200–400 for the board, plus hours of labor. And you lose your original warranty, risk damaging ribbons and connectors, and end up with a machine that still has an old CPU and battery. For that money, you could sell the laptop and buy a newer model with the RAM you want. Or, you could have bought a laptop with upgradeable RAM in the first place.

So, yes, it works. But it’s a repair trick for tinkerers, not a practical upgrade path.

Next time, buy a laptop with socketed RAM if you care about longevity.