I'm trying to understand what I need to do to make the last 500Meg of my 4GB memory visible on a FC4 x86_64. I assume that the 3.5GB - 4GB area is being used for hardware and I need to arrange for the memory to be mapped elsewhere. My motherboard, a tyan k8e (s2865) has entries in the bios for something called: S/W memory hole Remapping disable / enable H/W memory hole Remapping disable / enable MTRR mapping mode continuous / discrete It looked like one or both of the first two entries would do the trick, but when I enabled them all that happened was my add-in network card stopped working. At boot dhcp was unable to get an address and booting hung at that point. This happened s/w or h/w remapping was active (either singly or together. I have no idea what the third item is used for, the motherboard "manual" is a joke with it simply repeating the same meaningless phrase with no explanation. Hints? I'd really like to use all 4 Gigs. -wolfgang -- Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/