Extrme Gamer, sorry for the misleading information I have posted regarding BIOS. I was misinformed regarding that.
This is a wrong information. In my 1st post, I have asked you check the Hardocp review of the three cards, 770 Lightning, 680 Lightning and Gigabyte HD 7970 OC. Here is the link: HARDOCP - MSI GeForce GTX 770 Lightning - MSI N770 Lightning Overclocking Review
Even with voltage tweak, they were not able to overclock a GTX 770 over 1300 MHz. And mind it, it is a MSI Lightning version, not a stock one. And please read the performance summary or conclusion page properly. I am quoting from them:-
I guess I am putting the facts here, not hearsay
Did I ever say that the GTX 770 can cross 1300Mhz? Did I? I said I have yet to see a 7970 that can cross 1300Mhz in safe voltages. Besides, you can't do a clock for clock comparison between two GPU architectures to give brownie points to AMD.
Also, did you know that HardOCP never does apples to apples comparisons between GPUs? The test with highest playable settings for each card. That means the compared framerates are nothing but horseshit.
In this review they do seem to be using equal settings, but you are forgetting that these are tests in XHD (1600p/1440p), where the 7970 is advantaged by memory. In this configuration, we're giving him a 1080p (or was it 1200p?) monitor.