On the hunt for a couple Tahiti BIOS, any help would be much appreciated! Currently using 15.12 drivers and Claymore v12.4.

• HIS 7970 IceQ X2 (Hynix), currently hashing at ~265
  
• Sapphire 280x Dual-X (Elpida), currently hashing at ~255

Looking for something to flash on that would lower the voltage of these power-hungry cards and maybe squeeze a few extra Sols out (290-310 looks to be the peak they can do, right?) I've tried a few older BIOSes from here:

https://drive.google.com/drive/u/0/folders/0B2XVfIhkHZlfcVR0QzhlQlhJYTA

...but none have gotten me as high as others are reporting.