Okay. I forgot that my RX 470 is sitting right above my RX 480 (reference blower) inside my case. I put them both at 90% fan speed and now the RX 470 is at 64C and the RX 480 is at 57C. I suppose I could swap them around and see how they do.
*Update: Yeah now it's the other way around. RX 480 is on top and 65-69C and RX 470 is on bottom at 56-59C. I'm going to switch them back. The card on top has to run at faster rpm to keep cool, which with the blower is more noise. The RX 480 on top gets hotter (now 71C) than the RX 470 did on top.