real talk 1700x vs 1800x

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ok so i understand the fact that /g/ isnt a great place to have any actual conversations (4chan in general really) but im just curious, assuming you have a 1700x and a 1800x in the exact same build and both running at the same clock speed, they are going to have 98% identical performance correct?

im not sure how i can justify the ~$500 price for the 1800x if clock for clock its the same as the ~$400 1700x.

also how does their xfr thing work? does it have a hard limit for the 1700x and the 1800x has a higher limit? because assuming they are both under the same cooling solution they should hit the same clock speeds right? Honestly unless its really easy to OC to 4.5Ghz i dont think id put a manual overclock any higher then that