no, if you already have a core 2 duo dont bother switching to a new motherboard, cpu etc. Core 2 quads are plenty fast, faster than i3 for video encoding. Too much money to swap over motherboard, cpu and RAM, when you could just upgrade the CPU (depending on the motherboard you have) and have a very fast system. But really, just try encoding video with what you have, it may be fast enough for you. List your motherboard and full system specs if you want us to help you decide.