Since PD15 I have this hardware check failure on my iMac Pro (VEGA 56 PRO 8GB) when playing GTA 5 (via steam) and the game keeps crashing almost instantly and Windows 10 gets suspended. The graphics setting in GTA 5 don't matter at all, even at it's lowest settings I have this error. Strangely enough when using my MacBookPro (GeForce GT 750M 2GB) I have the same hardware check failure but the game does work without crashing. And than I don't even play on it's lowest settings. Before (when using PD14) I could play GTA V and GTA Online without any issues on the iMacPro.