AMD's margin gains are driven by growing strength in end markets.AMD raised its revenue guidance by $1.0B for FY 2021 and gross margins are edging closer to 50%.AMD's dollar sales growth is cheaper than Nvidia's and AMD might even grow faster.The most interesting revelation of AMD’s Q2’21 earnings, however, was the trend in gross margins. AMD's gross margin jumped 4 PP to 48%, 1 PP above guidance because of a better mix of higher-priced Ryzen processors and Radeon graphic cards. The uptick in g