4x2 ddr2 kingston dont show up, i get 3.6gb. help

i2cub4

Distinguished
Feb 1, 2010
46
0
18,530
i don't seem to be getting all of my memory .kingston 4x2gb 1066 ddr2 hyperx.biostar ta790gx 128m mobo. do i need to set memory up in bios .if so how?