here is the deal - I downloaded and installed fc4 test3 on my machine (2x246 opterons, Tyan S2895 mobo, 4x1G ECC ram, nvidia 6600gt 16x pci-express, SATA drive etc). Running the default kernel ...1286_FC4smp for x86_64 build. If I enable software-based PCI mem hole remapping in my mobo's bios then my workstation completely freezes after opening 1 or 2 web pages in Firefox or any other bundled browser in KDE, Gnome (that the first thing I noticed, there most likely are a bunch of other OS problems). If this bios setting is set to disabled then no problems, however then Linux does not see the full 4 gigs of my ram due to the PCI bus map (linux does see the full 4gigs if I set the memhole remap to be "software"-based). Anyone else is having the same issues with software-based PCI memhole remap?