This the same hype we always see ....
Mantle is gonna change everything ... it didn't
HBM2 is gonna change everything ... it didn't
More cores was gonna change everything ... it didn't
Smaller nm is gonna change everything ... it didn't.
While it has been nice to see AMD narrow the gap, the 2700X remains the only CPU we currently recommend in a particular price / performance niche. If you on a low budget (< $300 CPU), and your workload is say 70 % gaming and 30 - 40% video editing, then the 2700X is an excellent choice. If you can manage an extra $200, the 9900k is a better fit. It is currently th best gaming CPU on the market and it has the highest "value" in video editing (Testing by Pueget Sound / AdobePpremier).
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If you need to be the 1st one on your block to have the new shiny thing, by all means go ahead and do so. I can not recommend it as a sensible choice. Buyer's Remorse sucks. Now if it's out and tested and does change the current price / performance picture ... by all means jump on it when the 2nd or 3rd stepping is shipping. I don't gamble, most people in engineering don't, must be the math focus. You may think it's a sure thing ... but so did the people who bet on heavyweight champ Anthony Joshua before he got beat yesterday by that guy with the beer belly.
I just don't see the value in pre-ordering ... weigh what you win versus what you can lose. Let's even forget about the situation where the product doesn't live up to the hype ...do you really want to live on the bleeding edge ? We recommend never buying 1st stepping products 'outta the gate'. Whether it be CPUs, MoBos, whatever ... the folks on the bleeding edge wind up with the bugs, the BIOSs, that won't be right yet for 4 or 5 revisions, the MoBos with non working features .... and the worst batch related to overclocking ... later steppings will improve in all these areas. Being the 1st one on the block to have the new shiny thing, leaves you exposed to all those headaches and the folks coming in behind you will likely wind up with a better product and a higher overlock.
Remeber the Intel B3 stepping fiasco w/ P67 / B67 ? Remember the issues nVidia had with 2xxx series GFX cards ? Ask those users how pre-ordering worked out for them. Not trying to be harsh here, but just can't see any advantage to going the pre-order / early stepping route.