If there's an RTX 2080-equivalent GPU coming without RT cores then ray tracing is in big, big trouble
A third possibility is that Nvidia has a fallback plan. If the inevitably lousy first gen of a new tech (RTX in this case) fails to capture enough of the market, the Turing architecture will still work very well without it, under the GTX umbrella, hopefully for consumer-friendly prices. Yet another possibility is OEM options meant for specific applications, not as boxed products.
Besides, it's clear by now that Nvidia loves to release a wide range of products even under the same model number. Take a look at the no less than 5 iterations of the 1060.
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