Answer
Due to the AMD CPU included memory controller ,the memory speed will be varied depended on CPU being used as default operation frequency. For example, if the AMD Athlon and Sempron series processors being used, the system will run at 800MHz or lower. If use the AMD Phenom™ X3 Triple-Core Processors and Phenom™ X4 Quad-Core Processors, the memory speed might be able to support 1066MHz when RAM spec is 1066MHz . But due to the Phenom CPU and memory module limitation, the DRAM may need to adjust the voltage for supporting DDR2 1066MHz. For better compatibility to support 1066MHz. Please visit the following website for memory QVL of A780GM-A V1.1
http://download.ecs.com.tw/dlfileecs/manual%5Cqvl%5CQVLofA780GM_A%20%281_1%29.pdf
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