Seeking to improve Rx 480 performance.

- SAPPHIRE NITRO+ (100406NT+4GOCL) RX 480 4GB model with V9  runs at 220 H/s at factory  core 1306 / mem 1750  ( I think I can do better )

I tried pushing the mem over 2000 to duplicate other settings I saw posted on this thread but the PC crashed.
Card was headless so I plugged a monitor to it, same speed.  (ULPS is disabled for the card)

I have a Sapphire Fury running on same PC at 330 H/s using V9.

I see lots of references to bios mod's is the outcome the same as manually setting the Core and memory clocks in trixx or msi afterburner ?
 
Also I recall back in the day of Silt bios modes AMD was using signed bios's so it was reported to be impossible to modify bios without have a certificate to re-sign the bios file. Did AMD that drop that requirement ?