There's really no hard and fast rule here. Yeah, a adcomms probably prefer a 3.5 from Stanford than a 3.5 from a less famous school. But, theres is no adjustment that they actually apply.
Keep in mind that adcomms look at your WHOLE application in total. Your GMAt, your essays, your undergrad GPA, your recos, your interview... All of these add up to help them understand who you are. They don't focus on any one thing and make a decision based on that.
So, no need to think of it as "overcoming" your GPA with the GMAT. Yes, a great GMAT score will help, but a 3.3 is not a weakness, no matter what school you attended!
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