I was wondering if someone could help me out with a RAM question. Right now in my computer i have 1 512mb chip and 2 256mb chips. I just ordered a 1gb chip from newegg and my friend told me that its important to pair chips. The RAM is DDR PC 2100 and i can't find any info on whether or not they have to be paired and what problems could arise if they weren't. I also ordered a gig chip for my mom's computer which only has 256mb of DDR SDRAM pc 3200 ram right now. I got the 1 gig chips in case i want to upgrade them later but didn't have enough money to get 2 pairs of gig chips for the 2 computers. So will it cause me any problems to have 1.768gb of ram in 3 different chip sizes? and 1.256gb in 2 sizes?