What is the maximum workable RAM on a modern PC?

"6x 2GB RAM is what most LGA 1366-Boards allow easily.

With Core i7 (Nehalem) CPUs it is still relatively cheap to reach 36 GB RAM using 9x 4GB Modules.

With more expensive 8GB Modules, and the more expensive server boards, you can go up to 192 GB RAM while paying less than for a compact car. If you need more RAM than that, its probably going into the $100.000 range."