Hi Claymore,
I have many problem with many my grids: x 5 r9-270, x 6 r9-270, x 2 r9 - 270
When I run, I received 1 or 2 cards with stop driver VGA.
I use version 2.1, try with many config such as: ss - 2, HC: 512, 256 and default core, mem but still error. I can't fix it.
My command:
NsXpmMiner.exe -o ypool.net -u abcd.1 -p 1 -di 0 -ss 2 -sd 0 -hc 512
di 0-> 5
Ex: Card 0 stop driver, card 1 stop driver and no have TRT, CHD.

But no this error with other grid:5 x r9 280x or 5 x HD 7950.
Please see & resolve it for me.
Thanks