which one of those SLOTS labeled as 1,2,3,4 are the slots that power the back chips ?
Thank you !
Hard to tell. Usually connector 1 & 2 or 3 & 4 is in parallel. From the picture it seem not parallel.
I don't own sp20 so i can't tell, but if you had multimeter, you can measure the connectivity between connector 1 & 2.