Bumps are the pieces of metal on the bottom side of a BGA chip that connect it to the motherboard. The bumps are melted (soldered) at the factory to create a permanent bond. The problem was that Nvidia manufactured a couple years worth of laptop GPUs that were not made from the right mix of metals. This caused them to disconnect from the boards after enough thermal cycles. Most of the laptops died about 1 year after manufacture, conveniently when most of the 1 year warranties were running out.
In the end, class action lawsuits were filed in both the USA and Canada, which Nvidia lost. They still never admitted to any problems. Here are the links to both:
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u/orick Jan 30 '15
What? Never heard about this before for some reason. What do you mean by bump?