That looks like it may need a VID mod, not a FB mod.
On the 5870 Lightning, a vcore hard mod requires cutting off the link between up6225 and up6266 to give direct feed voltage to the processor without going through 6266. Then moving the vid resistors around the 6225 to change vid.
Don't know if the 480 situation is analagous, but maybe someone with more circuit knowledge than I have can use the info.
Hope somebody cracks it before mine arrives.
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It exists!
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