Bouncing Zabaglione Bros.
Legend
They aren't all falling apart.
For instance, HP has no mention of the dv2500 14.1'' series laptops on their Nvidia GPU RMA support page, even though it has two different variants of the G86 chip (8400M GS -64bit- and 8400M GT -128bit-, both coming with 1.2GHz GDDR3), and it has existed for much longer that the "G86-failure scandal".
How do you explain that ?
I'd take it that a critically-heating, massively produced defective GPU inserted into an old, smaller than standard chassis (14.1'', instead of 15.4'') would have been the first to show any symptoms, and yet...
I never said "fallling apart". The connections between the chip and the pads on the substrate are breaking due to thermal stress and migration.
How do you explain that Nvidia is replacing all underfill material in all it's chips, and switching to eutedic balls, even for chips that are effectively reaching the end of their lives anyway? It's very expensive to rebuild and requalify this kind of thing, it's not something you just do for a laugh, or drop 200 milliion on and hurt your stock price on unless you really, really have to.
Read the article, because I can't believe that you have done so if you have to keep asking these questions. Charlie has got the spec of the old underfill material, and it's rated only up to 60 degrees, and at 80 degrees it's a hundred times weaker. Nvidia chips run hotter than that at the balls and pads, which are effectively heatsinks into the chips themselves. This underfill failure is exactly what Nvidia pinpointed themselves when they finally admitted the problem, but you can see the underfill isn't rated for the very high temps seen on the balls/pads between the chip and it's substrate. The underfill works within it's spec. Nvidia is using it way outside it's specification.
The failures are caused by the materials and the way they interact with the heat stressing caused by the design and nature of these chips. Some will last longer than others because of the environment they are in, how they are cooled, how they are used. Others will fail more quickly for the same reasons, and laptops are currently the worst case scenario for failures. They are not the only case scenario though.
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