That happened to me as well when I tried running my Hynix D43's at low latency. I ran the 3:2 divider @ 200 FSB in the BIOS, and mem to 2-2-2 timings, then I wanted to go into windows and use ClockGen to see how high my RAM can go at 2-2-2 timings, but then CPU-Z showed 2.5-3-3 for some reason.