@The_Big_1 

Just for comparison. I own a pair of Powerline adapters of a different brand, but also rated at "1000 Mbps" and if I plug them in adjacent sockets of an extension cord with multiple outlets and no other electrical appliances plugged into either the extension cord's remaining sockets or the pass-through sockets of the Powerline adapters, then I get a maximum data throughput of 300 Mbps. This is probably as close to an "ideal" condition as one can possibly arrange at home.

It could be that in your case there are still some electrical interferences from nearby appliances at play, even though both Powerline adapters plug into the same dual wall outlet.

  @The_Big_1 

hi ya.

is there any sort of things that cause interference?

happy to try different things but if 1000mbps is no way ever achievable then that not what I paid for. If two units in the same plug socket can not get any where near 1000, not even 50% then that's just not right?

  @The_Big_1 

Unfortunately, that's how it is and has ever been.

I do agree that for users who haven't previously come in contact with this technology it can be quite shocking when they find out how low data throughput speeds tend to be during actual use.

There is usually small-print on Powerline products that goes like "actual data transfer speeds may vary", but it does not quantify the magnitude of the varying.

On older generations of Powerline adapters a good giveaway (hint) was that various manufacturers made Powerline adapters of the 500 Mbps class or 600 Mbps class that were equipped with 100 Mbps Fast Ethernet ports, knowing that in most use-cases the practically attainable Powerline speeds would not exceed the 100 Mbps-mark anyway. (obviously, using Powerline adapters within the same room is not considered a real use-case, as people usually buy them to get a network connection from one room to another room within the house)

As for interference in the electrical circuits.
Sources of such interference (or noise) are often electric appliances that incorporate so-called switched-mode power supplies. These are used in all sorts of electronic devices, like computers, TVs, stereo's, Wi-Fi routers, etc.
 

Anyway, if you need to get 1000 Mbps across any substantial distance from location A to location B, then the preferred solution (the "gold standard", if you will) would be to install Ethernet cables between the two locations.