Hi Aaron,
Well, I did it. I bought the AMD rx480 card and installed it. VegasPro14 no longer crashes so it is happier. The playback is better than before but certainly not anywhere near as good as the performance I get in Premiere Pro with the Mercury Engine software. Sure wish I could edit in Premiere Pro the way I do in Vegas but each time I try, I come crawling back to Vegas. It would be perfect if I could get the playback quality of Premiere with the editing capabilities of Vegas!!
The only knock I have against the RX480 is sometimes the fan gets really loud. Like both fans are running at 100%. The only solution to stop this is to reboot the computer. This tells me there is a bug of some sorts but not sure how is easy it will be to solve.
Erik