I have an Asusus P3V4X MB and have two slots filled with 128Mb RAM each (PIII 667). I added the second 128 when I noticed poor performance in my graphics apps (Adobe Photoshop, Illustrator). Of course I like having all of my "nice little system tray progams" running so I am at about 73% resources free at startup. If I load just 1 graphics app I am down to about 20% resources free. I really need to be running three apps at once. Will another 128 MB Ram do for this? I eventually would like to have a total of 512 MB but I cannot afford that at this time. So my main question is: Has anyone used all four slots successfully on this board at 133Mhz. I have heard some people having trouble with this. Please advise.