Ever since I upgraded my GPU from an r9 270x to my r9 290, my computer has been emitting a faint smell, mostly when playing games. When not playing games, I can only slightly smell it when I hold my nose up to my computer. At first I thought it was my GPU, but later I noticed most of the smell seemed to be coming from the PSU. I don't exactly know what smell it is, but it is kindof a smell that more electronics seem to emit. For example, my new casio calculator also has this particular smell to it. Consider that my casio has the same smell, I don't think it would be burning plastic. Though I wonder, what could it be? My PSU is not really displaying any signs of failure, and everything else is fine hardware-wise. Anything I should be worrying about?