My card is HIS 7970 IceQX2 (non Ghz).
1.After try many BIOS , I cannot break 1150Mhz on core regardless of how many voltage (@ 1150Mhz stable voltage is 1.263V) actually it can go to 1220Mhz with 1.32V but not stable (lot of glitch , snow dot , chess table etc). Is this limit because chip...