AMD interview questions

Got a call from HR recruiter from AMD for a 20 minute phone screen. She asked me basic information of why go to go to a competitor, why do you want to relocate and what type of job are you looking for. She said that some of the managers will be in contact with me soon. That soon ended up being 2 weeks. I did an hour phone interview and they asked me questions about my resume and said he will get back to me within a day to see if they would like to proceed forward. A couple of hours later, I got an email saying they would need my services sooner and I said that it would be a stretch, but can be negotiable if I get along with the team and manager. I did not hear back until a week later and did some follow up emails. I got a response back in a week saying that they hired a candidate and that he will forward my resume to other managers.

It's 3 hour technical interview with three different managers. They are friendly and helpful. The questions are basic. After three month, I get an offer. But I have already joined in another company.