Advanced Micro Devices just delivered the sharpest single-day turnaround of the week. AMD shares closed Friday at $449.04, up $44.64 — or 11.04% — from Thursday's close of $404.40, after touching an intraday high of $459.80. Trading volume hit 45.2 million shares, roughly double the three-month average of 22.4 million. The trigger was not a new product or a rumour: it was AMD's own...
