Hi Tommy,

Just a wild guess here, but some low-end machines use main memory for video RAM. I don't know if this affects how much memory is reported in My Computer Properties, but it could be yours is using 128MB for video, leaving 768 minus 128 = 640MB available for system use.

-Rick



>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