originally i had one stick of 256MB DDR400 RAM in my computer. and then i recently added a 512MB DDR400 RAM module in there beside it. But windows says it only sees 512MB, instead of 768MB. Second thing i tried was replace the memories sticks, and then my computer only read 256MB of physical memory instead of 768MB. but in both cases, "cpu-z" could read the 768MB no problem. so what's going on here?
Athlon 64 2800+
Asus K8V-MX mobo (2 RAM slots)
Athlon 64 2800+
Asus K8V-MX mobo (2 RAM slots)