PC vendors that rely on AMD graphics cards are delaying their shipments scheduled for the first quarter of 2010 by nearly two months, say sources at the manufacturers, DigiTimes claimed on Thursday. Radeon HD 5000-series GPUs and HD 4000-series GPUs are reportedly facing shortages through a combination of factors. The shortage of the 40nm Radeon HD 5000 cards is due to a low yield at Taiwan Semiconductor Manufacturing Company (TSMC) 40nm factories, while the 4000-series GPUs scarcity is allegedly AMD's own doing as it has scaled back production of older technology af