How much do preclinical grades matter compared to boards scores?

I'm a 2nd year student and I'm hoping someone can give me a little advice about how much preclinical grades matter down the road when applying to residencies. I'm currently doing well in my pre-clinical courses with about B+ average in most classes and a few A-'s. We recently learned our cumulative class average was ~85% and I'm currently at an 88% average, however I honestly don't feel like I genuinely KNOW the information that we've learned. My memory is pretty horrible and I feel like... How much do preclinical grades matter compared to boards scores?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums