Help please. I am a little confused about using some misc parts I have, trying to help another computer work better. I have a memory stick, 3200mhz that I was thinking might work in a computer with 2100mhz sticks in place. I think I can add it but that it will only work at the lower setting (i.e. 2100) . Am I on the right track or not? van hmmm my mistake, should be PC3200ddr and pc2100ddr I know they don't have the same speed etc, but think that the 3200 might work in the 2100, but internally converting to the lower setting. dunno for sure though.