Hewlett-Packard has quietly begun selling a new series of Pavilion PCs, revealing a growing interest in using Advanced Micro Devices' processors in its desktop systems. Of the nine new a500 series Pavilions, seven use AMD's processors. Limited details about the HP Pavilion a550e, a550y, a530e, a510e, and a500y PCs were available on HPshopping.com Wednesday afternoon, and by Thursday, the full specifications were available on HP's site. An HP spokesperson confirms the PCs are currently available. Read more: PC World.