I have the following memory modules installed (according to Everest Ultimate Edition 4.0) In my BIOS it is set to run at 133 (1:1 cpu/memory ratio, auto setting). If I take out the memory-module in DIMM0, it runs at 166 (4:5 cpu/memory ratio, auto setting). What would be the fastest choice: ~1.5 Gb memory running at 133 MHz, or ~1.25 Gb running at 166 MHz? Or could I just use the three modules and force cpu/memory ratio to 4:5 (no extra cooling). I use 3D-applications that requiere quite a bit of memory, but I never actually run out of physical memory. Any suggestions appreciated, sorry if my explanation is a bit complicated, English is not my first language BTW, the 256 MB PC2100 module was supposed to be PC2700, it even has a small sticker on it that says "256 MB PC2700 DDR333"