Hi, I have two gigabyte r9 270x OC edition GPUs. One of the GPUs mines fine at 1200 engine, 1500 memclock, and 18 intensity on X11. The other shows a hashrate but doesnt accept or reject anything. I recently RMAed the GPU that wasnt working and got it back and had the same problem, so i dont think it is a hardware problem. Any help would be great.
I don't have any AMDs myself, so just talking off my hat: Have you tried switching them out on the mobo? The card in the other ones PCIe slot. I myself had one broken pcie x1 once, everything else on the mobo was ok ^^