Don't upgrade soldered RAM on a 10-year-old laptop.

No. It’s not worth it.

First, if the RAM is soldered, you can’t upgrade it anyway. That’s the whole point of soldered RAM – it’s permanently attached. You’d need a new motherboard, and that’s basically a new laptop with extra steps.

But even if you could upgrade it, a 10-year-old laptop has other bottlenecks: slow CPU, outdated storage (probably a spinning hard drive), maybe a dying battery, and a low-resolution screen. Throwing $50–100 at more RAM won’t fix any of that. You’ll still have a slow, heavy machine that can’t run modern software well.

Comparatively, a $300–400 new laptop today smokes that old thing in every way – faster, lighter, better screen, and a warranty. The upgrade cost is usually half of what a decent budget laptop costs, and that new machine will actually be usable for years.

Save your money and your sanity. That 10-year-old laptop had a good run. Let it retire.