Same risers, same positions for all of the 6th. But I did change the riser on the 7th once the first one was fried. Also, how can a riser, cause such havoc?
it is a dead short trust me.
I killed the slot the gpu and the psu when I did it. My guess is I had a 750 watt psu and you have a beast to do 7 gpus so you feed it more juice and killed more gear.
I do smaller rigs and rarely bother with a lot of risers. Shorts are a big reason and my double cataract repaired eye are okay but not great for depth perception and close up stuff.
I did change the riser the second time as I suspected it might be a cause. I also checked the risers for obvious soldering issues on the capacitors or the PCI 1x connector that goes on the mobo to see if there is any shorting (e.g. solders touching etc). As far as I can tell, I don't see anything that stands out or not normal.