XB7 vs XB6 initial performance disappointment

I never had the ability to measure the speed to the modem independently on the XB6. But 5 Ghz device speed tests to the rooms beyond where the XB6 was positioned yielded faster and far more consistent measurements. What was once over 400 Mbps with the XB6 now struggles to reach 250 Mbps on the XB7, often falling short of 200 Mbps.
Such device speed measurements seem to fluctuate widely on the XB7 to these same locations perhaps due to the unstable received modem speeds.

Tonight's random tests show these deficient speeds to the XB7 modem.
Earlier in the day, the speeds were generally holding over 1000 Mbps.
I wonder whether the problem is with the modem design or whether the local Comcast node is unable to sustain the promised provisioning without RF line repairs/uogrades. Or could it be a combination of both issues?
I hope they send someone competent on Saturday.

Oldmanriver1 - it urks me that I don't get your gateway test option. But your numbers would irritate me more. Since your xb6 worked well you're cable and connection to the modem should be good. I am convinced the xb7 is a failure. Like the directv wireless genie.. they kept saying an update was coming,, and several did. It would not transmit a signal worth having. I kept it one year, wrote BBB, and directv replaced the wireless with the wired that I had. .today I lost my xfinity internet. Checked outages and it said all is OK, nothing found. Yet it had the same substation with a red circle and ! In it. Said unplanned outage, 51-500 tv/phone/internet down. If you get the tech I got- enjoy his quick tone and explanation you will not get 1 gigabyte speeds, and lower speeds are normal, and they do fluctuate. But your numbers aren't even a good 600mbps plan. Let us know what happens. Ed

Received another firmware update on the XB7-T. I do not notice an immediate impact, but I will keep an eye.

adammusic22 - Sitting 4 feet from my xb7, my speedtest gives 658.31 down and 41.17 up , after unplugging it to get that best result, while it would give on a good day @940 and 41! Another 1gbit capable win10 pc gives 806.67 and 41.91. So I run their diagnostics check and everything looks good it says. I do their reset modem - and we wait.. aahhh, 855, 864 down and 41.93 up. Glad I'm only paying for 1gigabit service, and getting 86% of it.. the other system now gives a whopping 731.24d and 41.89 up. Ya just can't fight'em. Well we can, we just can't win. Must be all the kids online doing their school work.. yeh, thats it... Thanks for your post. Ed

Well great scott!!! I found the test to the gateway in the xfi app.

The tech visit on Saturday morning did not fix the problem of inconsistent effective gigabit modem provisioning.
These posted measurements were taken just a few minutes ago.
Early in the day yesterday service was stable above 1000 Mbps, but by 7:30 pm last night, as well, the measured speed from Comcast to my XB7 was lagging.
The contractor tech yesterday removed one outside splitter and then begrudgingly reinstalled a new splitter on the XB7 modem coaxial cable (only after the removal drove modem bonded downstream channels to over a 10 power level).
There was no discussion about my specific provisioning issue. The contractor tech never climbed the pole to the 4 way tap amplifier behind the property. He had little concern that his interventions rendered the signal to my two X1 4K DVRs to unacceptably higher power levels that result in noticably degraded image quality on a 75 inch TV, particularly on the on demand premium channels.
Just as I had imagined in my mind's eye, his concern was whether my service was merely operable, and not whether it was working optimally.
It was only my demand to speak to his supervisor that led to the installation of the newer splitter.
He actually tried to tell me that higher than a 10 power level on the modem channels was a positive thing when I knew that not to be true. Is it possible that he actually believed that?
When I was instructed by the xFi app this morning to schedule another service visit to to slower than expected speeds to the modem, the agent could not discriminate between speed to the modem and speed to my devices.
That person suggested that perhaps I was connecting too many devices.
She could not grasp that the core of my complaint was about inconsistent effective gigabit provisioning. She kept suggesting I try ethernet connectivity.
I was just plain sad.

oldmanriver1 - that is exactly how my tech acted weeks ago. Flat said what he wanted and I had to accept it. Won't get 1gigabit, and it fluctuates. But, I checked today and surprise, I was to the gateway fine. And have you seen that xfinity is dropping our free security from Norton? Going to provide us with their security. Somehow I find that as protecting as, uh, nothing. Free Norton is a big plus for me staying, along with there is zero competition. Sorry to hear you have no recourse, perhaps writing BBB.ORG. It'll at least get you above the texting to a tech. It ALL started with a simple modem replacement, xb6 to xb7. Drop in service quality was immediate, multiple xb7 replacements do the same thing. AS MINE DID. I tried 3 xb7, and the dvr will not indicate 4k speed, but my xb6 did!!! You're in olive branch?? Go to the xfinity store on goodman, take your xb7, and ask for an xb6. They didn't have one at the store my last time and had to order one. Don't call xfinity for one, they charge for the shipping while the store doesn't!!! My xb6 came in as I got my 3rd xb7 working and I was hopeful that wifi6 was worth something. Absolutely worthless, as is the xb7 wifi. Good luck, you could use some!! Ed

I just found the gateway test in the xfinity app once again. I am getting 1196mps speeds tonight. We’ll see if this lasts.

daveg6 - looks good. I wonder it the kids being online for school actually are tapping bandwidth, or if xfinity backs us down during school hours. I'll be looking through the days and evenings now that I found the test. I'm pleased seeing my numbers and yours is encouraging. But oldmanriver1s speed to the gateway is pretty poor and his tech didn't help at all. Plus the wifi, for my testing, is not as strong as the xb6 was. Thanks for the info.

My speeds to the modem were still deficient intermittently yesterday, but by 7:30 pm they were roughly half of my gigabit provisioning.
Worse, I just noticed that somehow the contractor installer had managed to chronically cripple my upload speeds that were reliably just above 40 Mbps. Now the upload struggles to reach 30 Mbps.
Last night the xFi speed to modem measured my upload at 15 Mbps.
To summarize, the tech visit did not improve or stabilize my download provisioning or effective devices speeds.
His odd choice of splitter repositioning, only on the coax route to the XB7, caused my upload speeds to be compromised.
And without the aid of the splitter on my two X1 dvr coax lines, he raised the power levels beyond 10 dBmV which causes the tuner frequencies servicing the premium channels and others to suffer a loss of image quality on a very large screen 4K TV.
Because he was primarily dispatched to remedy an Internet problem, he had little concern for how his interventions might adversely effect my video signals.
He had promised to coordinate a trouble ticket to the maintenance department for my local drop amplifier and share that information with me. But after a while on his cell, he pulled away without providing the promised update.
I will try again today.

oldmanriver1 - thats maddening !!. Good luck.

A intended plea for help in a chat to explore canceling my services and moving to ATT gigabit out of necessity led no where on the repair side, but yielded another small service credit.
A real phone conversation with an overseas advanced repair tech led to remote diagnostics confirming that there is in fact a signal issue coming to my residence from the Comcast rf network, so they scheduled another tech to come tomorrow. Hopefully that person will not be another contractor/installer.
Thank you for your replies.

I had a superior older gentleman "fixer" tech last night. He was patient, informative, and a good listener.
He strung a new coax line from my rear yard utility pole to the house to fix one unspecified issue.
He removed the suspect in-home splitter leading to the XB7 that was installed by the contractor install tech.
He submitted a trouble ticket to maintenance due to the low signal to noise ratio on my upstream service, which had been a chronic problem for many years
now.
He gave me his cell number for follow up on the situation.
I told him upon leaving that my worst fear was the my issues were due to deferred maintenance on the local rf network.
He told me that concern was a possibility.
I am giving his new configuration a week or so before making a judgment because he indicated changes might be made from afar coming from the plant.
I want to see this through.
As he climbed his ladder to being down the old drop coax I heard him say - "Sometimes the best is not good enough". He repeated that line twice.
He was great.