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: "Intel Preparing to Launch New Xeon Processors for Potential Mac Pro Upgrade Aft…"
eWeek's own headline reports Intel unveiling the Xeon E5 Grantley family for server workloads, matching KitGuru's[3] coverage of the same early-September 2014 unveiling ahead of the pin's stored late-September/early-October date, though the page itself could not be verified directly.
KitGuru reports Intel unveiling the new Xeon E5 v3 "Haswell" processors with up to 18 cores on 9 September 2014, about three weeks ahead of the pin's stored 30 September/1 October date, consistent with the chips reaching the market before an anticipated Mac Pro refresh.
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