i had a laptop Dell inspiron 15 N 5010 , with 4 giga Ram memory , i had install windows 7 ultimate 64 bits , but i see that my Ram memory dosn't all workes , i had 4 giga ,but the system use only 3,87 giga , i trying to see bios , and others solutions but , the problem still , please help me and thanks for all ...
Due to rom, video ram, and other holes in the i/o map you will not be able to use the entire ram space. Also Integrated graphics can steal up to 256 megs of ram or more for the INTEL HD 3000 video. Intel HD Graphics 3000 can use a base amount of 256 MB on a Machine with 4 GB of RAM
So 4096 meg - 256 meg = 3840 Meg
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thanks a lot for your answers :)