Hello Eliovp, actually it is possible....
Hey! I also own a 5700 and i flashed a XT bios on it and copied 1500 straps to 2000.
I'm getting 57.3 Mhs out of it, but I saw your post. You said you changed "tRef (that gave me +1MH for ETH)". Where can I find this value in BIOS?
Can you help me? I dont use AMD MEm Tweak XL since I use HiveOS and I need to change that value in the BIOS itself.
Here you are, this is Micron 1500 Mhz strap (f0490202 in BIOS) example:
800900007D040000000000006A09000040020000142619133D00170006060002100000000508080 018000000218E06000000010101000101001C1800220B00000A0A0000B4000000B40000008A206C024C0000000A00040A130300011F2A0C00A500000002F 4130FA500000000000000
I changed 220B (tREF 2850) to E02E (tREF 12000)