Triple channel ram will usually work on double channel motherboards if their otherwise compatible, you can even use three sticks. Look in your manual it should show you where/how to install three dimm's of ram.
Also Ivy bridge may not be that big of an improvement over sandy bridge, only thing I've heard is Intel HD4000 graphics which isn't an upgrade if your using a discrete video card anyways. If your looking to buy now go with the sandy bridge i5
Thats my opinion