I have a bronze 600 watt power supply and was planning on getting the sapphire r9 390 when i noticed it had a tdp of 375 watts 0_0. However, for some reason the MSI one only has a tdp of 275 watts which makes no sense to me. Should I buy the msi r9 390 or can my power supply not even handle that? I would get the sapphire one but I feel like my power supply would not be able to handle it. Also, I do not plan on overclocking.