I have a powercolor r9 380 4gb gpu. Overclocked it since day one and hasn't given me any issues. I believe it's been around 8 or 9 months now. It's not the greatest high end brand name but it works
Powercolor has actually been around for years. I remember seeing them make previous GPUs when it was still nVidia vs ATI (before AMD bought ATI). They also make PSUs. They're more of a 2nd tier brand, but I haven't heard or read anything overly negative about them. They primarily compete against Sapphire in the GPU market.