Hello guys, I got few rigs set up on this Onda B250 D8P motherboard and all share the same problem - everything works great on every possible setup, except when you put card in 1st GPU slot(the 16x one), then it gives out constant 4Mh/s from a GPU that is in the first slot and other cards get unstable hashate(keeps jumping up and down), which also gives SMOS monitor wrong info on monitoring. It works perfectly on a 7 card setup with 1st slot being empty.
just got the same problem. With all my motherboards. Long time lurking and the fix is:
1) load bios
2) system agent
3) gpu settings
4) port 1 was set not like others. just set the same settings for port 1 like for others.
Wow thank you 100x . Spent all day looking for this solution.
If anyone is having trouble on the v4 motherboard just look for port settings and match port 1 settings with port 2 and 3 (set everything to auto).