hi list,my pc has 512 megs of duel channel ddr ram.2 -256 k stixs. the retailer where i was planning to get another 512 from ,informs me that if i instal either a 512 or 2-256 sticks,that they have to check to see if they match and are duel channeling.if not i cant use my original 512 and need to buy 1 gig or 2 new 512 sticks.is this true or aload of crap to sell ram? hans--regina sk.ca The NOSPIN Group Promotions is now offering our special coffee mugs and mouse pads with the PCBUILD logo... at a great price!!! http://freepctech.com/goodies/promotions.shtml