^from my brain lol...my vast network of knowledge branching out into every subject...lol *that was a joke*
But seriously, 1T is considered to be faster, by a small amount, but when using 4 modules of ram or more, it can become unstable, that is when you need to run 2T. So since you are running what i would assume is 3 sticks of 2gb, 1T DDR3 should work fine, but your ram might not be stable at that...