Gigabyte 6870, OC well with all games expcept BF3 why?

I am using this graphics card:

I am unable to change any voltage settings with MSI Afterburner. I've searched around the web and found out that this particular card does not allow any voltage tampering. With 3 fans it runs very cool and quiet, (54C full load OC'ed at 1000/1150).

I've overclocked this card at Core: 1000MHz, Mem: 1150Mhz (From default, Core: 915Mhz, Mem: 1050). This runs very stable with all my games (Batman AC, LA Noire, Dirt 3, Starcraft 2) except for BF3, which i've been getting extremely low frame rates (within 2 minutes of playtime), and then crashes.

o Intel Core i5 750 Quad Core Processor
o Gigabyte P55A-UD3 ATX LGA1156
o OCZ ModXStream Pro 500W
o G.SKILL F3-12800CL9D-4GBRL Ripjaws PC3-12800 4GB 2X2GB DDR3-1600
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  1. like any overclock the other games must just not push it over the edge,bf3 is really hard on gfx cards, just like overclocking your cpu it may run windows games and everything else fine but as soon as u load up prime or intel burn in bang its gone, have u tested your overclock with something hard on it like furmark? also it a long shot but if your overclock ur i5 heavily maybe your psu isnt up to it and shitting out with 2 much load (overheat, over current protection??)

    gigabyte p67a-ud3p
    aerocool e85+700watt
    gigabyte hd6950oc
    g skill 4gb cas 7 ram
  2. Turns out I just turn off Anti-Alias and it runs fine at ultra with overclock settings.
  3. by turning your anti alaising off ur no longer taxing ur video card fully thats why its not crashing you havent fixed anything ur just avoiding it and as soon as u run another tuff game its gonna *** itself again. back ur settings down till its stable, ur pushing ur video card all that extra for problem 2-3fps what a waste of time if its not stable enough to play ur games in their full glory.p.s. i have the gigabyte hd6950oc with the 3 fans and its pretty lousy at clocking higher at factory voltages over the factory overclock.
  4. BF3 is really using the card's power, making it crash. It is not stable. When you disable AA, it doesn't use it as much, making it not crash. As for switching the voltage, go into the Afterburner settings and turn on "unlock voltage control" and it should work. Your GPU is not stable now, and you should not run it like that unless you can add more voltage and get it stable.
  5. 6870's in crossfire cant even hang with that game.. with msaa turned on.. antialiasing so so .. but its the multi player aspect that kills it single player and co-op work fine..
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