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From Nvidia's point of view, they can sell more cards to different audiences instead of having them all fight over the same cards.
As an example, gamers want Ampere and not Turing. Miners want cards that are good at mining but doesn't really need cards to be all that good at gaming. So instead of only making Ampere for mining and gaming, they can make Ampere be gaming focused while Turing be mining focused and thus making more GPUs and selling more. The reason is Ampere is based on Samsung and Turing is based on TSMC. Nvidia knows Ampere will sell no matter what and they can't make more Ampere GPUs because Samsung is at full capacity on their 8nm node. So instead, they try to limit Ampere's mining performance while creating a new line of GPUs called CMP which is mostly based on Turing thus producing more GPUs and making more money.
This can also apply to next generation. Lovelace will go back to TSMC where Ampere based CMP cards can be on Samsung.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850
