I bought Asus z87-pro,I5 4670K,2x2GB Kingston Ram(1600MHz),some Cooler Master power supply,I am not sure which one,on the box write RS-500-PCAP-I3.I am planing to upgrade my GPU and I am thinking about AMD Radeon R9 280 Powercolor TurboDuo 3GB DDR5.I would like to get advice from you guys is it good to buy this GPU with my other hardware,my bugdet is near max for GPU.I would also like to know is it risky to use 500W power supply with that GPU.I am not planing to overclock anything soon untill I get better cooling and power supply.I am also open for any other GPU suggestions