[ubuntu] Bios not using all available RAM

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http://ubuntuforums.org – Hello- I have just removed 2 x 1GB DDR2 DIMMS from my desktop and replaced then with 2 x 2GB DDR2 DIMMS. On boot the Bios reports only 3GB is usuable - this is before the OS boots. There are two OS's, 64 bit Ubuntu and 32 bit XP. Both report 3GB of available RAM. The mainboard manufacturer says the board can support 4GB of RAM. Am I only seeing 3GB because of the memory card? Thanks (Hardware)