Here's some more AI stock madness for you: Memory chip technology patent holder and licensor Rambus (NASDAQ: RMBS) is up 200% over the last 12-month stretch, driven most recently by hype surrounding new memory protocols needed for data center hardware and AI. 

This was confounding to me, as I'm (just barely) old enough to remember Rambus' checkered past. From the early 2000s through the early 2010s, the company earned a reputation as a patent troll. Rambus seemingly turned over a new leaf, and some investors are optimistic for the intellectual property (IP) portfolio in a new era for AI. Is Rambus stock worth your money? 

These days, Rambus makes the vast majority of its money from memory interface chips. The company also licenses its IP portfolio for various other memory and security technologies that companies use in designing their own chips. 

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Source Fool.com