New
#11
Even if you bought a second kit of 2x2 of the exact same memory and set 3 DIMMs in the correct slots, usually by leaving an empty slot between DIMMs, those 3 would work in triple channel mode. Some, but not all mobos can also simultaneously run a set of three in triple channel mode with a 4th in single channel, but part of the DDR3 specification is that any 3 matching DIMMs (model#, capacity & timing) can be run in triple channel mode. Its not really necessary for all three DIMMs to come from the same package in order to get triple channel mode. They're just sold that way for convenience. If someone has lead you to believe you have to buy a triple channel kit in order to get triple channel mode, they're full of sh*t if they weren't sorely misled by some greedy vendor who wanted to make a quick dollar.
I just don't see the point in throwing away good parts.