Originally Posted by go3mon
Unfortunately Fedora 14, 32bit version, allow to use only 3gb of ram.
Not quite. Switch to PAE kernel as long as your CPU supports it, and you can use up to 64Gb RAM on your 32-bit system.
Do `uname -r` to check whether you already have PAE kernel installed, if you do, problem is in your MoBo (most probably solved with BIOS update unless your system is very old).