Okay, here is the story on vpll mod for REX: 1. vpll is controlled with AS324 above PCI-E x1 slot. AS324's non-inverting input is controlled by DAC and we need to disconnect this DAC from pin 5 of AS324 and set the voltage on this pin manually. I had issues trying to lift the leg of AS324 and broke it so I had to completely remove AS324 and replace it with LM324 (same as AS324): 2. Before soldering LM324 back I have lifted up the 5th pin of this IC (the picture also indicates how to connect
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