I don't see anything marked like that. I see, A, F, N0, N1, 4,8 and 16 as marked items along with one pad circled...
the card is v6.3d
Sorry my mistake. That was the previous generation stick. Not sure where the newpac probe points are. They will be mentioned in this thread somewhere.
The problem is, i don't find clear informations to setup voltage screw!, it's very nebulous... I tryed a freq of 500 MHz but i get lot of errors? Maybe the screw is not setuped correctly (i got the initial screw setup)
The voltage pot should have the flat side set to about 4 - 5 o’clock if the stick is orientated so the heatsink is laying on a surface and the usb connector is closest to you. These shouldnt need voltage adjustment though. I ran mine at stock voltage and got a freq of 650m.
Usually poor performance and errors is due the USB hub you are using.