Taking off AA lowers the usage of video ram. If i kick the AA to x16 my 560 GTX Ti with everything maxed (Besides Ambient occlusion off sense its broken) kicks the video ram past 1GB.

Could be a number of things, could be related to drivers. Could be related to the GPU drawing more power than the PSU Supplies. Could be the fact you replaced the motherboard with another.

Remove ANY nVidia drivers. ATi doesn't use them. Did u have a nVidia card before this AMD?