Is there anyone within ATi that you know? If not, reach out to people relevant to your position (maybe one of the groups that are hiring) and express your enthusiasm and ask if you might be able to have a short chat on the phone at their convenience so you can learn more about it. When writing this e-mail, though, you have to be careful not to sound desperate or like you're sucking up -- the purpose of doing this is 1) to get a good sense of what the job is like and what it's like working at ATi, and to 2) get a sense of what the people are like at ATi. Ideally, try to reach out to the managers that will be doing the hiring, because they know what they're looking for and might be able to help you. If you have a good conversation and really click, sometimes the manager will recommend you for an interview (it's almost like a self-initiated phone screen) -- but the purpose of you doing this is not to try to get an interview; you really should use it as an opportunity to get as much info as possible.
[Whoops I didn't read your post carefully durr]
If you get an interview, again, try to reach out to people to get a sense of what the interview process is going to be like. GPA isn't always everything -- if you're a stellar candidate otherwise, fit what they're looking for work-wise, and are an awesome person, those things come first (knowledge, skills, abilities, and culture fit come before GPA -- GPA is sort of a tie-breaker / quantitative "measure" of your knowledge, skills, and abilities for most firms EXCEPT when you are at a professional school (e.g. learning finance) and your grades directly reflect your competency).
As far as the interview goes, prep hard but not too hard because you'll turn robotic. It really depends on what kind of interviews they put you through but know both your technical and fit stuff and be ready to talk about your strengths, weakenesses, how you work as a team, yada yada as well as whatever's relevant to the position.
Be professional and courteous and don't forget to send thank-yous to whoever might have helped you out or interviewed you -- 1, it's common courtesy, and 2, you'd be surprised how many people neglect to do this and it can help recruiters remember you.
tl;dr try to get in contact with someone in or familiar with AMD/ATi because they will be able to help you much much more specifically
Good luck!
Edit oh yeah if you get an interview, that's where references really help .. most companies pull your references after your 2nd or final rounds of interviews to sort of confirm their impression of you.
Edit two even if you don't get the internship, stay in contact w/ recruiters cuz there's always next year
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