Softpedia reports; A complex design like Nvidia’s Kepler or AMD’s Tahiti, out of the 3.5 billion or 4.3 billion transistors respectively, some might not function properly. As such, the companies will likely disable some units that contain the malfunctioning transistors and still be able to sell the GPU with a lesser profit margin.
Latest product, the Intel Ivy Bridge has a pretty good performance. The product was not much have a defect in iGPU. But the company believes the third quarter of 2012 increased the number of defective products.