Are you trying to mod your BIOS? What exactly are you hoping to accomplish?
If you're trying to overclock, you typically only need to resort to BIOS mods for extreme OCs. No idea what clock stretch is.
No, setting the fan above 100% will not make it run any faster.
I just copied off a bios that had my same memory and stuff like that from another rx 580
to get a nice stable oc so my coree is 1433 mhz and memory is 2100 mhz and its stable well it doesn't seem unstable I have a toasty card so I can never stress it for too long but on my games it runs well
I wonder if clockstretch is some kind of auto oc in it's own way cause i can't find any info on it
I might just call amd and ask them. and the new bios along with the timings makes my card real fast and fixed my artifact issues here is the benchmark
https://www.userbenchmark.com/UserRun/21906164 cause I used to get artifacts when on chrome its honeestly hard to tell why cause I'm pretty sure it happened without oc
the highest score I could get on my RX580 was 62.9% but that was unstable unless I wanted to give it dumb amounts of power