As a side note, according to an
AMD rep, the HBM in Fiji can only run at 500, 545, 600, or 666.6MHz. It rounds to the closest, and any other reading displayed via software is incorrect.
If this is true, then any review where they overclock the HBM between 525-570 is actually 545. It appears that 545 is virtually guaranteed, and 600 is rare without a good liquid setup.
I'm not really interested in testing myself, unless there is an easy canned benchmark that usually has parity (which I would define at 1440p as a 970 performing in-between a 290 and 290X/390, as this is where it usually lands on aggregate index summaries.) I can push my Fury Core 3840 higher than 1066MHz if I overvolt it, so I'd do any testing at 1100MHz which has proved stable thus far with an overvolt. And for the record I would not be interested in your arbitrary no bios mods, as this almost seems like leftover brand wars salt from 6950 to 6970 unlock > 570 days. It's a variable much like max stable overclocking is.