On some of the older machines,
MEM had to be evenly built .... or only partial mem would be recognized.

>Hi Gang!
>
>I have an eMachines T3504 PC at home (3.2 Ghz CPU and 256 Meg of RAM).
>
>I purchased 512 Meg of RAM yesterday and installed it. There are only 2 RAM slots.
>
>1) I left the 256 RAM in the first slot and placed the 512 RAM in the second.
>
>I thought the total would be close to 768 RAM.
>
>But it was 640 RAM in My Computer Properties.
>
>sigh.....
>
>So....
>
>2) I changed them around. I placed the 512 in the first slot and the 256 in the second.
>
>Still 640 RAM.
>
>Any of you have something like this happen? What should I look for? BIOS settings or what?
>
>Thanks!!
>
>Tommy