Ok lets clear a couple things up
From this
We can deduce that Nvidia sold ~100 million desktop GPUs alone last year. Nvidia don't actually sell full cards they sell GPU dies to board partners who then manufacture a card which includes a PCP board, RAM, Power supply, ports and connectors etc then they box up the card and sell to retailers. For the $1000 Titan for example the part that Nvidia sells for US $115.79 / piece so given Intrinsic's lowball $1b estemate (GPU sales accounted for $3.2b of Nvidia's sales last year and most of that is consumer GPUs) that would be 8.6 million Titans. According to the Steam hardware survey the GTX 770 is their most popular high end card at the moment one of those is just $65 and keep in mind these prices are via a reseller so Nvida probably charge less.
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