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Originally Posted by lordpwn
Integrity checks on a GPU? Reliable source, please.
Artifacting and image distortion are also perfectly normal when you're overclocking the hardware and it's getting close to its limit. This is not a symptom of any damage as you claim, just the card temporarily malfunctioning from the high temperature. It'll usually get back to normal - not because of any magic "reroute" crap, but just because it works correctly when it's _not_ overheating.
I think you're confusing the component disabling done at manufacturing stage and sometimes through drivers (to work around bad shader units, etc.) with TV sci-fi or something.
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Oh please, reliable source? I design the fabs for GPUs and cache systems. I think I know what I am talking about.
Yes, if you read my post, overheating can cause artifacting. If the GPU continues to run at that level, it will cause gate cell degradation, which will in turn cause cession of the silicon, which in turn causes your card to...well, "die".
I am not confusing anything. We always put in additional gates and threads in case a small (and I mean small) section of the chip is damaged by heat degradation. A chip can't self heal, but it can reroute its ability through the backup transistor gates.
Let me show you:
You will notice that PMOS stress liner is adjacent to the NMOS liner. In a typical setup, the PMOS liner will saturate up, but if it is damaged, the PMOS can saturate down (this takes longer). NMOS gates can be symmetrical, unlike PMOS gates, and so the NMOS liner can draw both slow and fast. When the NMOS draws at low power, DC currents can go right through it, provided that the pull down is open. Normally this is seen as bad, considering that you get a low output and electron buildup, but when you are creating a rerouting path, you can use this to your advantage. If you make the CoSi2 layer thin enough, it can hold electric charge perfectly fine, until you actively open the PDN. This allows pass through upon significant damage to a small section of PMOS. This disadvantage is, however, that this reroute is much slower than the original pathways because they are not really "open". Make sense?