I was planning to buy a 512 stick just one of em, and use it with a 256 stick thats already in there from compusa. And take out the other 256 stick. I think I would see a diffrence with the 512 working with the 256. The price on gateway's website for the 512 stick is about 229.00 compared to 129.99 at compusa. I wanted to buy the stick i was all ready for it, until the computer tech went on and on about it