Is it ok for a GPU to run +1000 mem clock for long perioids of time? My MSI gaming X 1060 6gb can run +1000 mem clock without errors but i'm thinking perhaps it's not good to run such high speeds for a long time... My rig is 2x msi gaming x 1060 6gb, asus 1060 6gb dual fan and evga 1060 6gb.
As long as the rig is running stable and not over temperature, it's perfectly fine. However more in terms of overclocking, more is not always better and you might be using less than optimal settings with such a high overclock. If you're on Windows, a good way to find the most efficient settings is with the GPU utilization sensor in GPU-Z. Ideally you want to slowly increase your overclock settings until you reach 100% utilization. That should be the optimal setting for your card.