I have an old Kingston HyperX 1GB (2x512MB) DDR 400 (PC3200) RAM installed on my old PC. After 5 years, I decided it needed more memory, so I purchased another DDR 400 RAM, a Corsair 2GB (2x1GB) PC3200 kit.
However, after installing the new RAM, after I boot my PC, BIOS shows DDR 333 only...