I have the same issue 20hash. I tried the memory and clock at anyway and still doesn't work better than 23.
I have the latest Nvidia drivers,
Can you confirm is due to the 452.06 version?
Regards
I have 1 1660 super with hynix memory (MSI ventus xs) and i can get it run to 32 Mhs using -502 core and memory at 62% power limit. The driver i am using is the 446.14 version and it's stable for mining since june last year if i remember correctly. If you think it's driver issue then you can try to download another driver version but are you sure you have the hynix memory? not micron or samsung?
Well it's the EVGA GTX1660 Super ultra gaming; I guess it does have the same memory? but I'm not so sure.