

My late father went to cook a steak in his propane stove/oven one evening. Usually his steak would come out fantastic, but something went seriously wrong that evening.
The stove started smoking and stinking the place up pretty quickly. What was the problem? There was a fucking dead rat in the bottom of the oven!
Needless to say, steak was not consumed that night. Hell, even after daddy threw out the steak and cleaned out the dead rat remains, he never even used the oven again.
Part of this has to do with inevitable flaws in manufacturing. Nothing is ever totally perfect.
GPUs have many multiple identical cores running in parallel to achieve the processing power they do. But during manufacturing, let’s say for simplicity that the GPU is designed with 64 cores. But in testing, only 57 of those cores actually function as expected.
So what are they gonna do? Well they’re damn sure not going to scrap the entire chip, they just basically block out the bad cores and sell it as a lower end model with reduced processing power. I’m practically certain this also affects the potential bus width of the final product.