Use what's there. your
mobo must support it. That much of a jump in
RAM should give you a much quicker machine. So many every-day tasks are done in
RAM--
Whenever switching programs,for example. The more
RAM you have the easier your computer can utilize it to temporarily store data (up to a point).
I'm not saying you'll have a raging speed demon here... but the difference should be noticable.
Please post back and let us know how you make out