It seems,
5700 come swith Micron D9WCW MT61K256M32JE-14:A they are specified to run at 1750 MHz (14 Gbps GDDR6 effective).
5700xt comes with Samsung K4Z80325BC-HC14 : they are specified to run at 1750 MHz (14 Gbps GDDR6 effective) too.

waiting for results with optimised kernels...