cpu supported list GIGABYTE TECHNOLOGY Socket 2011-3 - Intel X99 - GA-X99M-Gaming 5 (rev. 1.0)
turbo is only for 1 core, I will avoid 2686v3 qs all core boost only 2.3Mhz, it better 2683 v3, oem 2.5Mhz but some have 2.7Mhz all core.
I do flash, try reset bios or upgrade to p.5