I've currently got a first generation mac pro with 2gb or ram (512x4) Newegg is selling 1gb sticks of ram for $43: http://www.newegg.com/Product/Product.aspx?Item=N82E16820208199 Which is a good deal, (a REAL good deal). As is this: 2gb stick for $74: http://www.newegg.com/Product/Product.aspx?Item=N82E16820208200 The only problem is, whats the best way to buy RAM in my situation? I'd like to have at least 4gb of ram installed, and I heard its best to have ram setup in pairs on the two riser cards. How should I go about this best? Im thinking of either buying 2gb or 4gb extra for my computer, but at 4 x 1gb I then would have all my slots taken up. I dont feel like spending the over $100 on ram. And Im also looking at what will give me the best performance if indeed everything has to be in pairs (can I have 1 and 512 + 512 in riser A and the same for riser B? will the performance be optimal or should all sticks of ram be equal, for example 1gb + 1gb in riser A and B, and does it matter if its in 3 + 3 sticks per riser card?) Any suggestions? ---- Part two of my inquiry is this: since CS3 is still a 32 bit application, and takes advantage of only about 3gb of RAM usage per application, does the memory usage max out at 3gb? I'm mainly looking at giving photoshop the maximum ram possible, and am curious to know what the option is when having more than 3gb of ram available....(though, i know it wont make a difference). Thanks!