The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per macrumors.com: "…ps in August Intel plans to move up the launch of its 14-nanometer Coffee Lake processors, introduci…"
Wikipedia's Coffee Lake article gives the 25 September 2017 announcement and 5 October 2017 launch, the 14nm++ process, six-core i5/i7 and four-core i3 desktop parts, the i7-8700K's clocks and $359 price, and 300-series chipset requirement.
TechPowerUp's own headline, published 19 April 2017, reports Intel accelerating the Basin Falls unveiling and moving up the Coffee Lake launch - consistent with the pin's claim of an accelerated August 2017 Coffee Lake debut - though the article's full text sat behind a subscription wall and could not be retrieved to confirm further detail.
DigiTimes' own headline and 19 April 2017 publish date - the original source reflected in the pin's own sourceUrl - report Intel unveiling Basin Falls and moving up the Coffee Lake launch ahead of schedule, consistent with the pin's claim, though the article itself is paywalled and could not be verified directly.
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