I dont have any problem with AB .....

Left memory clock first...try raise Core step by step...I start from 1200 VGPU +200 - 1250 VGPU +250 - 1300 VGPU +275 - 1350 VGPU +325 - 1375 VGPU +350 -1400 VGPU +350 - 1410 VGPU +350.... after you get good core try raise Memory clock....I run Memory Clock 1225 VMEM +300 and PLL +300 PCIE Set From Bios 115.