I am trying to upgrade my 4670 video card to one that plays dts Master and Dolby TrueHD. I do not believe my 4670 cannot do that. While upgrading, I am planning to buy one that also display 3D. Does the 6670 do 3d as well as dtsMaster 7.1. I can get the 6670 1gb DDR3 for $10 less than the 6670 1gb GDDR5. Is there an advantage going GDDR5 over DDR3? What about the 2Gb 6570? Which one do i need for hometheater use? 1gb DDR3, 2Gb DDR3, 1gb GDDR5? Pricewise, they are similar- so i just try to see which card will serve me better over another. Thanks so much.