Hey all. I'm thinking of buying a second hand Radeon R9 270 from a friend. I'm however concerned about my Power supply. I've asked a few people and I never get a direct answer. I have a DE 480 PSU. I7 4790s cpu. 8gb Ram ddr3. One 120mm fan. I've used a few online calculators and it estimated that load should be about 350W. Would I be fine with my current PSU?