It doesn’t look like the OS is detecting your cards right. Instead of xxx-xxx-xxxx you should see the bios number. Mine was the same until I did a fresh install of hiveOS as people had recommended a few days ago (not self-upgrade or firstrun from command line, it needs to be fresh install with newest stable image on flash drive).
Once OS detects the cards correctly, mem values should work. Even when I try to set mine above 1075 in web UI, amd-info
will never show mem going above 1074 MHz.