I went to a copule websites, and it seems they want me to purchase more expensive memory and they say others will not work in duel channel that is cheaper. Crucial.com seems to disagree and they say this. It sounds like as long as they are they same Duel channel is good to go as it's not the memory that is duel channel, it's how the system uses it. Is this just a gimmick some of these companies are using to get more money? Do I have to install matching pairs? A: No. No, you can install modules one at a time, and you can mix different densities of modules in your computer. But if your computer supports dual-channel memory configurations, you should install in identical pairs (preferably in kits) for optimal performance. Q: Does my computer support dual-channel memory? A: Yes. To benefit from the performance advantages offered by dual-channel systems, you should install memory in identical pairs. Installing a kitted pair is the best way to ensure that your modules are identical, right down to the chip count.