Earlier today I attempted to upgrade a beige box (AMD800 w/128MB RAM, W98SE) with a 256MB DIMM (Viking PC133). Successful memory check upon boot; but I get either a windows protection error when starting windows, or BSODs (vcache & vxd errors) if windows actually boots. This occurs whether the new DIMM is installed by itself or with the original 128MB (also PC133). In the BIOS settings (Award) the options for the DIMM sockets are "Normal", "Fast", "Turbo" & "SDRAM 8/10ns". Tried 'em all to no avail. I thought bad memory, but that very same DIMM is causing no errors on my own AMD950; been playing Max Payne for the past 2 hours with it installed. Any ideas? Ian Carmichael PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml