I use Ubiquiti access points with a wired only router. Their APs have features like power control on the individual radios, minimum bit rate selection to help your device pick the "best" signal. But it is the device that is in control of what radio to choose.
It is possible that you just had too few APs. Instead of two maybe you needed three to get enough coverage. If you have wired infrastructure, then add APs, IMO.
I don't believe that my house has enough space to justify having access points, my one router is centrally located and I have about 50-60% signal strength at the far ends, in fact I can receive enough signal to stream near HD at the end of my driveway (200+ feet long) so rather than deal with that from a setup perspective, and spend about the same as some of the newer 802.11ax routers (cheapest I could find on a quick search for 3 AP's would run about $250 from Ubiquiti) its much simpler to get a single router.
You can be the sucker...err guinea pig that tries out new technology first
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The primary reason it has more speed is it is using 160mhz of bandwidth rather than 80mhz. There is only 180mhz total bandwidth that is not subject to the rules to avoid stuff like weather radar. This means it is now impossible for you and your neighbor to coexist without interfering.
Maybe they have some magic but this is like putting more cars on the road when you already have massive traffic jams.
I am playing wait and see for a year or so. Anything I really care about performance on I use ethernet and anything I use on wifi is not being limited by the current technology.
I understand where you're coming from, I'm not usually one to jump into a new level of tech, I like to wait until it is vetted and reformed, I have just been having issues with my router lately and need an upgrade anyways so why not just ump right in.
Neighbor interference is a virtual non issue, through the whole house I can only see a neighbors wifi at one end and it is a super low signal, even sniffing for hidden signals, there are 3 networks total I can see, a hidden network that shows sometimes depending on the weather at minimal detectable levels, a neighbors network at minimal levels on one end of the house, and that same neighbors "xfinitywifi" network which indicates that they are using an Xfinity provided wireless router which forces this, all networks visible are 2.4GHz and on channel 1, I believe 40MHz bandwidth (if memory serves). So minimal to no interference for the new signals.
Sort of tangential, but is there a particular reason you're interested in reducing power draw? The power consumption of just about any router is going to be pretty miniscule in the grand scheme of things.
Also, from a quick bit of reading it seems that the touted power savings of Wifi 6 are more on the device end, not the router end. Which makes sense, to try and save battery life for mobile devices.
Every bit helps man, once I get to the point of upgrading clients (namely light switches and stuff) there should be a fairly significant reduction in power consumption during idle state, I understand that overall I may reduce power consumption by maybe 50-100W overall, maybe even not that much. Even 25W of continuous usage adds up to about $50 per year worth of electricity, and that's money that could be spent on other things.