Higher mobo costs, higher psu costs, higher heat management costs (more heatsinks, fans, etc). And if you want to upgrade from that, you'll have to sell both cards.
What is wrong with selling your current card and getting a higher end version? Is really more economical to you? Or does it just line nvidia's pockets?
Remember, nvidia makes from the nf4 and from the extra chip sales that would otherwise be lost.
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