Hello; I have had a Compaq Presario 1500 laptop for about 2 years now, and I am quite un-satisfied when it comes to multi-tasking several applications at the same time. Sometimes it is so slow that I cannot minimize a full-screen application to read up on something on the net. I currently only have 256 megs of ram, but I read on the internet that tihs model could have up to 1 gigabyte. This is great, but therein lies my question. The laptop has two ram slots, one of which has been empty since i got the computer. Could I get a gig of ram and still keep the 256y meg stick as an added boost? or is the 1 gig the maximum for both slots?