I have just built a new system using a P4-1.8Ghz cpu on an Abit BD7-Raid MoBo. If I use 2 x 512Mb DDR's, the system will only fire up in 640x480x16 on an AGP card. It will run all colours and resolutions with a PCI graphics card. If I remove either memory stick, leaving one, it runs with the AGP...