I am using AMD 2500 barton 333Mhz cpu chip on a biostar m7ncd motherboard. I have 256Mb pc3200 ddr memory that can handle 400MHz. I tried setting the clock at 200Mhz and yep she wouldnt post. Cleared the CMOS and reset to 166MHZ clock and everything is fine. The motherboard is a cheap one I know. Hey I got a good deal on the barebones kit. Does anyone know how to bump this up this thing to 400Mhz. Oh when I tried it all it did was a long beep about once every second or two.