Home › Google Adwords Question When there are both CPM and CPC ads in an auction, what will the AdWords system do? By · Wednesday, November 19, 2014 When there are both CPM and CPC ads in an auction, what will the AdWords system do? Answer - Calculate the effective CPM for ads. Google Adwords Question GA Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.