I am wanting to add more memory to my Gateway GT5064. It currently has 1 GB (2 x 512mb). The PC can hold up to 4 GB and has four slots, two which are free. I am wanting to add 1 GB so that I have a total of 2GB. My question is, it is okay just to add a single 1 GB stick of RAM correct and not 2 x 512mb? This would give me 2 sticks of 512 and 1 gig stick.