You were right, i just tried settings of 40000, 50000 and 60000. After a lot of reboots and narrowing my personal maximal MaxPhysPage value, my system boots with values up to 48AE4(hex), while a value of 48AE5 and above leads to "Insufficient memory to initialize Windows." A very strange number imo. Changing the AGP Aperture Size or MinFileCache and MaxFileChache values does not affect this MaxPhysPage limit on my computer. MaxPhysPage=48AE4 yields 1161MB Ram. Please post your hardware configuration.