At 5:40PM MST, my newly unboxed AC6900 went online using default settings accept for using 192.168.0.1 for the router IP address, Mixed mode on both 2.4Ghz and 5Ghz, manual channel 11 and 48 perspectively. Reserved IP addresses for all devices accpet for 4 devices, 2 NAS, Airport Express and one printer. ATTMicrocell in the DMZ. Xbox set in Media Prioritiztion and connected to a wireless AC bridge connected to the 6900s 5ghz radio. Apple Airport Express set up for static and bridged to the 2.4ghz radio.
SB 6180(ISP Modem)>EA6900>24pt Gb network switch<>all other wired devices connected to switch.
Mac Book Pro, Mac Mini, 2 iPhone 4S, Ipad and DIR-865L (xbox) bridged and Airport Express connected wirelessly to router.
FW Loaded: 1.1.42.158863
Room temp was 80-85F. Afternoon sun heats up the office.
After router was onlie for 1 hour: Operating Temp. 32 to 104°F (0 to 40°C) listed in User Manual.
Top center section of router temp was 105-109F.
Bottom center section towards back of router temp was 125-130F.
NO external cooling...yet.
Measured using laster temp gun.
Will let run for 24 hours then check and try updated FW maybe.