In any given generation, Intel only makes 3-4 different consumer processor chips, and from those they derive dozens of models by selectively disabling features and limiting clock speeds. Sometimes the disabled capabilities are defective, but a lot of it is purely due to market segmentation. Intel even once sold software upgrade codes to unlock extra cache memory on some low-end processors, showing that all of those models had passed QA with the full cache, but shipped with a third or a quarter of it disabled.