AMD recently announced its 40th Anniversary celebrations. Coincidence has it that the company reached another milestone at around the same time. It celebrates shipping its 500 millionth x86 processor, what the company specializes in. As the company, like most other companies is facing turbulent economic weather, the celebrations are largely low-profile. To reward its loyal customers, the company announced a contest that involves following AMD on Twitter, answering the question(s), and standing a chance to win one of four HP Pavilion dV2z ultrathin notebooks powered by AMD's Athlon Neo processors. Details of the contest can be read here.