I was given one of these mainboards. It runs fine with two memory modules. I added a third, same size and speed, but different number of chips. I expected it would just fallback in single-channel mode, but the master clock dropped from 266 to 206 MHz. Firstly, why 206 not 200? I have seen mainboards were the memory access speed fell when extra modules were added, but the CPU frequency stayed up (meaning master clock was the same).