Hmm i think it might run that witcher.
Sure effects would not be on full, but who can play on full.
I always lag behind few years and am able to play all games just like anyone else.
Just tweaking settings until its playable.
Right now on old i5 - 3570 non-k with old r9 390
You can get this fairly cheaply, people are dumping it onto used-online shops all the time.
r9 can be especially cheap sometimes.
And its a old beast with 8 gigs of vram.
Its a funny case some series of them had this weird problem with overheating so people usually thought they were bad and often sell them cheaply
There is a known bug, it just never throttles the fans properly that is all.
All you need is some program (one of those overclocking ones from manufacturer) that will throttle those fans for you and run it after startup and voila (ps make sure to limit frames always, it will cook itself and crash, if not limited :-))