Hello there! quick 2 questions for the community. firstly, I am getting a msi radeon rx 480 gpu and I would like to know the best OC speeds/voltages on it with the stock cooler it comes with. The second is in the future I plan on doing a 2-way crossfire with another card added on. Will my build which is here be able to handle it without extra cooling if I keep the OC speed and voltages at factory default? Thanks in advance!