Try going to abit site and downloading the manual. I have that board and can not find anything on high density ram but then again I am not reading the entire manual either. Are you asking if you can use 4 sticks of 128 mb? If so yes but you will not get 1gb. 4 x 128 = 512
I posted the Crucial link for a reason. It lists the total amount of RAM supported (4GB), the max per slot (1GB) & the max density (512Mb) <<< notice the small "b". Density is in Megabits. Now all you need to do is figure out how to calculate density.
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