Hello to everyone, I have linux ubuntu x64 and only are detected 3,8GB from 4GB installed, my motherboard is an gigabyte with graphic card integrated but i have it desactived because i use a 8800gts 256mb. The microprocessor is an AMD athlon 64 -5200+, in Xp x64 whole memory is working (4gb). Somebody know why happens that? Thank very much