15.200.1055.0 is older branch without codepath for Fiji, so this is likely merging of 1055 & 1046 which is Fiji aware. http://www.3dmark.com/compare/aot/37817/aot/37847/aot/38332/aot/41285/aot/41338/aot/44926/aot/46847 1st launch driver for 8.1, no DX12. 2nd 15.200.1040.0 Tonga code path. 3rd 15.200.1040.0 Tahiti code path. 4th 15.200.1023.10 Fiji code path. (quite best in everything. On DX11 just a little bit) 5th 15.200.1046.0 (15.7 WHQL) 6th 15.200.1055.0 (original does not have code path for Fiji, but inf config added by asder00. So not fully Fiji aware.); While it does best in draw calls, its gaming performance is under 1023.10/1046.0 and crashes firefox in case you have game open and then open new tab. 7th 15.200.1046.2 Seems like it has improvements from 15.200.1055 but does not cause crashes. Edit: this 15.200.1046.2 crashes Firefox upon opening new tab exactly same way as 15.200.1055.0. So now it is certain where code came from. Edit2: Something in new Firefox tab kills it. Not sure what, but As I changed default new page from "about:newtab" to "about:blank" I can open new empty tab without crash.