Better check with the people you are buying the main system from on a few things. You said it was a compaq at one time. I find that compaq will not accept a lot of card changes easily if you do not know how to program to make it work and understand exactly what you are doing. What I mean is things are not easily plug and play on them. I get this from a couple different friends that are in the computer business. I haven't tried myself so ask the seller about it. These guys that told me this are among the best in the industry and neither will touch compaq personal systems so I give them credibility. All the systems I have used are pretty easy to change cards on. I use the GF-4 card and it is great. Try for that one if you can.