https://www.techpowerup.com/vgabios/192320/sapphire-rx560-4096-170419
Funnily, they do. I will force return two of them cause seller had them advertised as 7000mhz memory (even for gaming these are sick!)
I found by a complete fortune, that the Techpowerup bios (only one) is the same device ID by sapphire and is the 16 CU variant..... All of the cards accepted it, but i think the TDP difference being big (this link is probably for the Normal Sapp pulse 16 cu, with higher TDP) my main gpu one was struggling and choppy, but yeah, all of the 4 cards worked.... i just rolled them back to the 14 cu one, cause well, 6000mhz base memory speed sucks much.)
I do 420 h/s and 14 mh/s max with them on the 14CU original bios with timing mods with PBE

R0land, i really respect you man, used your Hynix MJR timings for my 580 8gb (complete rip off/downgrade compared to the lower priced aorus 4gb).
I have to say though, both your strap and that experimental xmr one do BSOD without errors within 2075-2100 mhz memory... not sure though, If those cards never give error, can i just use PBE straps and 2300++ mhz instead? whatcha think?
also your micron one, is it different than the PBE one? better you think?
I can share/ give access to any of my cards (2gbs gigabyte powered and non, also have access to 4gb non powered,strictly micron only (gigabyte too) )