Reballing RAM costs $200–$400 — usually not worth it.

Probably $200 to $400 all in, and I wouldn’t do it unless you really know what you’re getting into.

That price covers the labor (reballing a BGA chip is delicate, time-consuming work) and the new RAM chip itself. Lab rates for this kind of microsoldering run $100–$250 just for the rework, and the chip adds another $20–$100 depending on capacity and scarcity. So expect $150 on the low end, $400 on the high end.

The real problem: even after you pay that, you’ve still got an old laptop or console with old everything else. And if the tech messes up — which happens — you’re out the money and the device. For most people, selling the old machine and buying one with the RAM you want is cheaper and less risky.

Unless this is a rare vintage machine you’re restoring for keeps, don’t bother.