Marvell (MRVL) -10% AH after: 1) Warning it expects FQ3 (Oct. quarter) revenue of $765M-$785M, below a consensus of $813.4M. The chipmaker blames weak hard drive controller sales caused by soft PC demand. 2) Announcing CFO Clyde Hosein has resigned to "pursue other opportunities." Corporate controller Brad Feller will serve as interim CFO until a replacement is found. Rival LSI could trade lower in sympathy. Hard drive forecasts have been quickly going downhill.