Your board is PC100, isn't it? A vendor told me, that, some years ago, the manufacterers changed something, he didn`t know what, so that PC133-RAMs produced after that change don't work in many PC100-Boards anymore, so they sell them as PC133-only-compatible. I decided to try it for my S7-DFI-Board and I brought them to work only if I set the fastest timing in BIOS. 1 step slower, it randomly recognized the RAM or not. After adding a third module, which was PC100, this was only recognized if placed in slot 1. (all 128M) But 1 PC133 in slot 1 and 2 PC100(64M) in 2&3 worked - quite curious.
