Using this procedure:- I get: -6mv = hex FF convert to dec 255 -13mv = does not work, try it and you will see what's going on. -19mv = hex FD convert to dec 253 -25mv = hex FC convert to dec 252 Now usually we apply the formula (hex value) convert to (dec value) multiply by (6.25mv) , now that formula would not apply here. If we have a formula that made sense of this then performs it warrants a test, otherwise I think we need to not do it due to lack of information. I think I did take a risk when adding GPU voltage offset codes to a bios that did not have it and flashing for testing, I was lucky it didn't cause an issue. Now I wish to tread careful with this as it could lead to a damaged card. I will view your bios to see if it has gpu offset hex in the Voltage ObjectInfo table.