actually the RX 460 is quite efficient, as efficient as the gtx 1050 and gtx 1050ti in terms of power consumption/perofrmance ratio: http://www.guru3d.com/articles_pages/msi_geforce_gtx_1050_and_1050_ti_gaming_x_review,7.html
Why is the RX 480 so in-efficient in comparison then?
Hey. I have a something like a problem but not exactly a problem. When I was with Win7 few years ago when my PC goes to IDLE (only monitor turn off not sleep state) my gpu fans was stopping after few mins. I upgraded back then to 8.1 and used it till Win10 came out. And upgrade to 10. In both 8.1 and 10 then my PC goes to IDLE the fans are not stopping. The GPU temp when not using (only MSI afterburner opened) is 31C