Posted 28 September 2005 - 10:15 PM
If you have video card that is intergrated on a motherboard, it might be the one that's using those 128mb of ram. It's often called "shared video memory" which means video card takes away certain amount of memory from the system memory.
If it isn't the case, then try removing one of 128mb sticks and see if windows will display same amount of ram as before or it'll go down. Try removing every one of 4 sticks individually and see what windows will tell you. It might be possible that one of memory sticks is faulty, especially if it's not a major brand like Corsair, Kingston, Crucial, Micron... .
Hope that helps.