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Solved
CM1150V modem -Comcast 1Gpbs paired with R8000 X6 Tri band router
Firmwares all at currnet level (CM1150V v04.02.02) (R8000 - V1.0.4.62_10.1.74) CM1150V - Reset to Factory defaults and provisioned CM1150V firmware push from Comcast Xfinity Illinois Xfinity Illi...
The R8000 router's speed test in the QoS would never report over 400Mpbs
Had Xfinity/Comcast out they replaced Coax RG6 from pole(arial line) to house to NIB and then RG6 from NIB to splitter with one outlet to TV Box and one to Netgear CM1150V -- then direct connect CAT6 to R8000 wifi router and CAT 6 to PC/MacBook.
I had to reset router to factory defaults - using OoS speed test in Firmware on R8000 still wouldn't report over 400Mpbs
Then using PC wired ethernet to R8000 i was able to obtain 945Mpbs via Ookla and Xfinity speed tests.
Returned the XB7 - good to go.
Speed test inside R8000 is foobar
The R8000 router's speed test in the QoS would never report over 400Mpbs
Had Xfinity/Comcast out they replaced Coax RG6 from pole(arial line) to house to NIB and then RG6 from NIB to splitter with one outlet to TV Box and one to Netgear CM1150V -- then direct connect CAT6 to R8000 wifi router and CAT 6 to PC/MacBook.
I had to reset router to factory defaults - using OoS speed test in Firmware on R8000 still wouldn't report over 400Mpbs
Then using PC wired ethernet to R8000 i was able to obtain 945Mpbs via Ookla and Xfinity speed tests.
Returned the XB7 - good to go.
Speed test inside R8000 is foobar
You're right. The built in speedtest is borked.
Reason why is you can't switch what server it connects to for testing speeds and it rarely picks the fastest one.
Its why we usually recommend testing with a pc direct connected to the router.
I'm glad to see that you got the issue fixed though!
If you mark it solved, it might help the next person with your issue.