Just had to share this story that happened last week. My housemate had a 17" Early 2011 MBP. Radeongate; the old girl finally gave up when he was doing work on Final Cut Pro X. Wouldn't boot into recovery mode, into the OS... you know the score. He took it into the Apple Store. Immediately failed on graphics test. Because he's in the U.K. with consumer law and because it was originally purchased through the Apple Online Store, they offered him a brand new 15" 2017 with the 460 Radeon and 512GB SSD. No quarrel, no quibbles, just went in and they did that for him. So just a quick bit of reassurance: if you're also struggling with Radeongate, you're in the UK, and your MBP was originally purchased through Apple, it's worth a shout to take it in to a store. You never know! All my best.