Date: 04/30/07 (Computer Help)    Keywords: google

I've googled this, and seen a number of answers, but all of them have to deal with hitting the 4GB memory ceiling. I'm nowhere close, so I'm hoping someone's seen something tailored more towards my problem.

I just upgraded the RAM in my system. The motherboard is an ASUS A7N8X-X, and contains three DIMM slots. Each should be able to contain a 512MB DIMM, for a total of 1.5GB, and it's possible to mix and match.

Currently, I have a 512MB DIMM in slots 1 and 2, and a 256MB DIMM in slot 3. I have attempted switching them around so that the 256MB DIMM is in each slot, and still have the same problem.

When the system boots up, the machine recognizes and tests all of the memory in the machine, so I have 1.25GB RAM, and the system knows it. But when XP (Pro, fully updated) starts, it shows I have 512MB RAM, no matter what I do with the DIMMs. When I run SiSoft Sandra, it too shows 512MB available RAM, but a motherboard scan shows the DIMMs accurately-- so the system (with XP running) at least sees the DIMMs and knows they exist. I've read about a bug where Control Panel::System will only show 512MB no matter how much is there, but Cacheman is also installed on my system, and it, too, shows only 512MB available.

I'd really like to be able to access the rest of that RAM, if possible. Has anyone ever seen anything like that, and do you know what I can do about it? Thanks.

Source: http://community.livejournal.com/computer_help/772394.html