I meant all GPUs in general. Your's is ok. It depends on the ambient temperature around the rig. Mine is idling at 48C right now, with the fan speed at 70%, and the ambient is around 30C. 50C is acceptable, but it could be better. But if it starts idling at 60C, then you gotta turn up the fan speed. Or turn the AC on.
And then again, some graphic cards just run hotter than others because of their power consumption, type of cooling, fabrication process, etc.