The RAM sticks dont exactly have to be the same amount. But the banks that they are in have to be. Say if 1&2 were one channel and 3 was on a different channel you could have 2 x 256Mb in 1 &2 and 512 in 3 and still use DCDDR.
you need another 256 in order to use those sticks in dc.
If you already have 1 256MB and 1 512MB. You could put the 512 Mb in slot 3 by itself (slot 3 is on its own channel). Then you put the 256 in slot 1 and another 256 in slot 2 (slot 1 and Slot 2 are on the same channel). This way the sum of slot 1 & slot 2 equals 512 and slot 3 equals 512 as well.
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