Hi :

Been trying to figure out a RAM memory puzzle. I am running Ubuntu 12.04 (64bit) with a dedicated graphics card (Nvidia) & 4GB of RAM. However, when I look at system info, only 2.9 GB of RAM is showing. This amount is verified when I run System Monitor, free, or htop. The 4 RAM sticks are seated properly as I checked my BIOS which shows the actual 4GB RAM.

My question: where is the missing 1GB of RAM?