I'm having a similar issue and wondering if anyone can help. As you can see, one card is under-performing significantly.
http://imgur.com/P4idOaTIgnore GPU 0
GPU's 1-3 are R9 290 Tri-X
GPU 1 has a 1x riser plugged into primary pci 16 slot.
GPU 2 has a PCI 16x riser plugged into the 3rd x16 slot on the bottom.
GPU 3 has a 1x riser plugged into a 1x slot.
Try dropping Windows. I always ran into annoying issues with single cards under performing when using Windows.
And please, in the future, do not bring threads this old back from the dead. If nobody has posted in a thread in a few weeks, then you are better off making a new thread.
Thanks for the reply. Unfortunately, windows is the most practical option for me right now.
Normally people complain when people don't search and just randomly post new threads. Damned if I do, damned if I don't.
