From the chart on the right, it can be easily seen that the Vcore is determined by 5 VID pins. Different combinations gives you different output voltage. (VID4 to VID0, logic "0" pin means connected to SGND, "1"- open).

In order to get 1.55v, we need to set VID4 to 0. In order to do that, VID 4 pin28 can be connected to SGND (pin 31) on the L6711 chip.

Since pin 29 is connected to SGND, you can just interconnect pins 28 and 29 using any conductive material.

In order to use 1.55v, you have to set it to 1.150v and the output voltage will be 1.55v. When you select 1.4 or 1.425 or 1.45V in BIOS), the output will remain as 1.4 or 1.425 or 1.45V.

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