1 stick is slightly faster than 2 in benchmarks. That is Unless you are using Nforce 2, which will then enable dual channel mode. But having 2 sticks in all cases lets you have more "open pages". Either way you can't tell the difference so go with 2.
Its true for Nvidia nforce2 chipset based motherboards, as well as intel E7205 Granite Bay chipset and Sis655 chipset based motherboards. Basically, any motherboard that features dual channel memory support can only take advantage of the feature when the memory is installed in pairs.
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