Okay so the crashes just seem entirely random the black screen just happened Overwatche's menu screen whilst I was showering and I was playing GTAV yesterday on the highest settings I can without it being hideously low fps without a hiccup, I can only assume it must be the ram that caused an error?
The Card I have has the stock bios it's one of the 290s that first hit the market and it's using bios number 2 (switch on the card), due to the 1st one failing when the 290x flash came out, A few years ago. I've read a bit about the Sapphire model being bad for black screens and possibly updating the bios may fix it? Also some people say underclocking the memory helps does anyone have any experience with these? I'm not sure where to start with it really, had I of known the Sapphire would be such a pain i'd of replaced it when it was still under warranty.