I am looking for powerline adapters which can do ~70-100 megabit/second with OpenWRT. I know this is very circuit dependent but still, some experience would be great here. How is the WPA8631P w/ OpenWRT? (The house is maltese stone, it probably would withstand a medieval siege but the wifi propagation is not that great.)
Not the question you asked , but...
Officially not supported, but they work with a 3rd party image, I think I maxed mine out at 250mbit.
The downside with the 8630/8631 series is the small amount of flash - you will not have much room for installing packages. The 8630P has been moved (or is begin moved?) to "tiny", whereas the 8631P still is on a regular build.
After running the 8630P (v1 and v2) for several years: IMHO the PowerLine part performs relatively well if you upgrade the firmware on the PLC chips - way beyound what's officially supported. I can't say too much about the speed as we had a 40MBit/s Internet connection. However, I'm more than happy that I no longer need them (I ran cables).
They don't like being on all the time, every now and then one of the PLCs would just crash (not the OpenWrt/WiFi CPU), a reset (even triggered via software) would restore the connection.
I realize I'm not answering the question you asked, but bear with me.
I've used all manner of powerline adapter. They all suck. Terrible performance.
If your house is wired with coaxial cable, you could consider using GoCoax's MoCa adapters. They're bulletproof. I use them currently to provide a wired gigabit backbone to which the 3 APs in my house are attached.
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Thanks! Where can I read more on upgrading the firmware of the PLC chips?
This is how I did it: Sysupgrade question for new device (TL-WPA8630P V2) - #83 by andyboeh