** Shares of networking and custom AI chipmaker Broadcom AVGO.O fall 1.3% to $257.20 in extended trade

** Company forecasts Q3 revenue of about $15.8 billion, above estimates of $15.71 billion, according to data compiled by LSEG; forecast fails to impress investors

** "We expect growth in AI semiconductor revenue to accelerate to $5.1 billion in Q3, delivering ten consecutive quarters of growth, as our hyperscale partners continue to invest" - CEO Hock Tan

** AVGO posts Q2 revenue of $15 billion, roughly in line with analysts' estimates

** AVGO up over 12% YTD

(Reporting by Juby Babu in Mexico City)

((Juby.Babu@thomsonreuters.com;))