test 1 [null] [256] test 2 [256] [null] test 3 [256] [512] test 4 [512] [256] how about test 1 [null] [512] test 2 [512] [null] does it get detected in the 1st place?
how about borrowing another stick of RAM from someone to do some testing? try [256a] [256b] [256b] [256a] [512a] [512b] [512b] [512a] if possible