Originally Posted by raghu78
you will have to run it at 1150 mhz and be satisfied. the gigabyte cards are voltage locked. the cooler also doesn't seem to be helping. if you can return the card do it and get a Sapphire HD 7970 OC with dual X cooler. they have unlocked voltage and good cooler.
My reply is mostly directed to the OP with the gigabyte wanting 1200mhz core..
I just recently replaced my gigabyte 7870 Ghz edition and upgraded and bought a Sapphire 7970 OC Dual-X Edition with a bios switch for two bios..one switch at 950mhz core and the other switch for 1000mhz core...it is voltage unlocked as you said but the most stable clock i can get where i see ZERO artifacts is at 1175 core/1600 memory...i recently built a rig for a friend as well with the same kind of card...the same exact limit when overclocking with his same sapphire card...most of these 7970's reach a ceiling limit of 1200 mhz "IF" you get lucky but honestly...anything over 1100mhz core clock is still great because it isnt just the speed that these cards are good with..but they have the most shaders and bandwidth out of all of AMD's current cards...well thats without talking about the 7990...but the 7970 at 1100mhz core clock is really just icing on the cake and anything more is just a cherry on top so dont feel bad if all you can get is 1100mhz stable...that card is still a monster at that clock regardless...be happy with what you got at its current clock rate...like i said..its not just the clock rate that makes this card a monster...its that bandwidth, amount of shaders, 3gb of DDR5 ram that can easily reach 1600mhz and the teraflops it outputs is just ridiculous...our 7970's are good to go for the foreseeable future.
The DualX edition cards are very good coolers up there with the Windforce3 coolers that come on the gigabyte cards...my card on load never goes above 55C, NEVER and i stressed tested the card at 1175/1600 on all sorts of stress testing software and benchmark software. I always look for the tiniest artifact...soon as i see an artifact i lower the core down a tad or adjust the voltage or just tinker with the settings until i see ZERO artifacts and freeze-ups/BSODs...once you reach that point..you found your optimized point ..pushing a card with very slight artifacts is not a good idea imho...i rather play it safe when it comes to 400 dollar video cards.Edited by moey1974 - 4/9/13 at 9:04pm