djbordie, thank you very much for this suggestion! I overclocked my ASUS Strix GTX 980 and wow what a difference! I don't get framerate drops in EXTRACTION SITES with SHADOWS ON anymore!!! This is really, really awesome. I had no idea there was that much unused video card left over.
For anyone else considering overclocking, keep in mind that if you increase the stock voltages you'll also increase the heat generated by your video card and this can have an adverse effect on performance. See how much you can OC on stock voltages before considering overvolting your card. My card seems able to handle a fairly aggressive 1350mhz GPU clock (1425-1445mhz in-game with 'boost', whatever that is) with a 7.5ghz memory clock. I increased by power target to 110% and modified my fan curves to be 10% faster from 60c to 70c and to max out at 100% at 80c.
These numbers don't make a hell of a lot of sense to me since I don't know how graphics cards even work these days. YMMV. Also the Strix 980 (which I only bought because it was the only 980 in stock at Fry's at the time) seems to be abnormally good at overclocking for some reason, or at least that's what the internet seems to be saying.