Problem with A8N-Sli and Ram


Jan 9, 2012
The motherboard is A8N-Sli, CPU Athlon 64 3000+.
Till now the computer was with 2 sticks of RAM, each 512MB DDR400 Kingston. Now I've got a new A-data 1GB DDR400, and I put it in one of the free slots. BIOS recognise only 1.5GB, I tried separately, and all of the RAMs are working properly. BIOS is last version I think (I upgraded it soon). Is it the problem beacause the new one is 1GB stick? How can I make the computer recognise all 2GB ram ( Without double channel ram mode) ?