I have a ASUS T6P Deluxe , with an Intel i7-940. The motherboard supports triple Channel memory. I have 6gb 2gb x 3, and just got 16gb, 8gb x 2. I am trying to figure out if it would be better to add the new ram to the existing or to replace the existing. I am posting from my ipad so its easier if i just include links instead of copying the specs.
Although I have no benchmarks to back this up, I believe you will be better off running the triple channel ram. If you are not getting lag from ram issues, I personally don't see a benefit in increasing your ram and losing a channel (the manual says it will run in dual channel mode) in the process.