question is , do you really need the max memory speed for the applications that you are running ? Most likely not and you can call it a day. the time it will cost you to maybe find something slightly faster won't be worth the trouble.
And not even 1 error should be allowed, not even a warning during rowhammer test should be ignored, it means your ram is running on/over the edge and will destroy your OS install in the run.
Bad ram and bios shadow functions....so many things go wrong eventually.