I've been starting to have some issues with my Motorola SURFboard SB6141 so I went ahead and replaced it with a Motorola MB8600.
Running speed tests on the SURFboard were consistently in the 245 down / 23 up range.
Right before swapping out the modem it pulled 241.6 / 23.34.
However, a couple speed tests with the new modem are now pulling lower download numbers. I've run three so far and the highest it's hit was 200.92 / 24.04 (other two were in the 170 range).
Why would a newer (and faster) modem be pulling lower download speeds than the old modem?
there could be a few reasons,
Which tier are you on. try a factory reset on modem. Im assuming its activated already.
I've noticed quite a bit of times when first setting up a new modem. I have to have two separate Mac address's during initial setup. When rebooting the modem. I finally connect to my router. Then I'd get full speed.. Initial setup 75% of the time had slower speeds if I left the same Mac address "computer" connected without factory reset.
Secondly the sb6141 had 8 channels on downstream. docsis 3.0
the mb8600 has 32 channels docsis 3.1
the 8600 give the opportunity to have a much more linear form of bandwidth limiting.
QAM factors. 8 6Mhz channels of 256-QAM will give you a maximum theoretical 343Mbps
in a docsis 3.1 modem QAM factor raises significantly 4096-QAM. one channe 192Mhz can theoretically give you 1.89Gbps or 1890Mbps
if your modem is connecting on 3.1 currently and connected on 3.0 previously.. Comcast has now a greater and more efficient way of dialing back your speed to the provisioned rate subscribed.
I am assuming your subscribed to "Extreme 150"???
Thanks for the reply.
I'll try resetting the modem and see what happens.
I looked at my bill and it says "Extreme Internet" and "Download as fast as 300 Mbps"
Just an FYI. If you do perform a factory reset to defaults, you will lose any customized settings, and they will need to be re-configured from scratch.