Nice! Did you have any issues overclocking the non-PCIe 6-pin MSI cards? Mine are crashing if I push them even a little (just got some in the mail yesterday). I'm finding that my cards that have six-pin PCIe cables are more stable. I think this may have to do with a limitation of the power delivery from the molex header on the USB 3.0 riser cards.But, it seems like you have a mix of both types of risers and mostly non-six pin cards and have no problem hitting 300+ kH/s. I wonder if my ASUS Z87-Pro is to blame at all?
If I plug the MSI card directly to x16 slot, I have no problems pushing it to 320+ kH/s.
Edit...now I'm starting to confirm my thoughts that it's a power delivery issue...that can simply be mitigated by not applying any OC changes while the GPU's are mining. If I adjust clocks when cards are idle, then restart mining, seems like this may be more promising. I'll have to play with this later tonight after work. Maybe I won't have to RMA after all.....
Edited by gfgrimm - 3/11/14 at 11:38am