ok.,i'll try later.,but if i increase the Vtt the cpu reference will auto increase on the same time.,is it ok or do i need to set it back to default (0.760)?
Yes, Set VTT1.20 and MCH ref to 0.68 as you set it before, then go raise up VTT to 1.26 you 'll notice MCH Ref will auto increase It doesn't matter. Go and check in ET6 you 'll see it still 0.68 in Windows because it just a Ratio of Vtt and MCH Ref only.