NVIDIA interview questions

Applied to position through the company's job website. Went through phone screen which was all technical. Was not given the chance to ask any questions. About a week later made it for onsite interview. I interviewed with about 5 engineers including the engineering manager and an architect. Because all of the interviews consisted of hard problem-solving technical questions and none of which focused on behavioral interviewing it was a mentally taxing interview (8 hours long) and led me to believe that likely there are some hard-to-deal with people in the group. I answered all of the technical questions correctly. But then the manager asked me a simple question about the design. I at first didn't understand the question and didn't answer it correctly. This peeved the manager who re-asked the question --but this time in a very irritated tone. Even though I had answered his technical questions (some of which are better suited to a software engineering developing C++ than a DV engineering coding SystemVerilog) correctly I feel something interpersonal happened. Anyway, after a week of waiting I never did get a yes/no answer back from the company and had to email the HR person to find get the final answer. It's always better for the company to give an answer back, because if the company never responds yes/no it makes the company look very disorganized and unprofessional which I think is probably an aspect to the group I interviewed with and is also evident from my experience working with former Nvidia employees who are touted as the "best and brightest" from this organization.