Your "80%" estimate surely does not leave much -- if any -- room for COGS alone, nevermind R&D.
That leaves 200m/quarter, it s not unreasonable to assume that Intel mobile dpts RDs expense drain as much as AMD s whole RD, it s not like their mobile offering is not reusing IP from other CPUs, particularly the GPU wich is derived from the main CPU line.
As said if we are to follow the usual "specialists" estimations even secretaries and sweepers are millionaires at Intel...