Hello,
is it possible make a custom rom with RX470 4GB an done for RX480 8GB ?
thx
I made a custom rom for my Sapphire RX470 8Gb card. I used the Polaris Bios editor tool.
It should work for any RX4.. card.
I changed the memory timings for the 2000 MHz strap to equal that of the next lower strap - and voila
the hash rate went from 23Mh/s to 25Mh/s just by that change alone. I also lowered the core frequency
from 1260 to 1150 to save some power. I will look at lowering voltages next ..
But the custom rom development is a pain here - Custom roms are done in Windows, then I have to reboot
into Linux to run miner tests...
The voltage is another story, you can set each vid for each dpm manually, but you'll have the risk that the controller won't deliver enough power to operate decently.
That's why it's more interesting to tell the voltage controller to start at a lower voltage offset.
in a lot of cases you can do this by modifying the vddc offset in the rom, but with these rx's, there is no voltage offset in the rom, you can add this though, but that's more than opening a tool and changing some numbers
Working on one for the 480's though
Going for minimal power and maximum hash!
