Recently, I just purchased a stick of 256 mb PC133 ram for my 1998 Dell\nXPS R400. Dell says this machine will hold a max of 384 mb of ram,\nhowever, several articles on the web say that despite what Dell\nsays-the computer will hold 256 mb sticks for a max of 756 mb.\nHowever, we tried installing the 256 and two 128's. The computer\nrefused to boot to Windows. Am running Windows 98. Have moved the 256\nto different slots and have tried various combinations of dimms on the\nboard. We reset the bios, and my brother says we need to reinstall Win\n98 and see if this will work. When we remove the 256 stick and\nreinstall ram to the orig. configuration, the computer does say "memory\ndecreased in size". Anyone know anything that we might not be doing\nthat would help?