I have a pc with the following specs: CPU: Pentium4 630 3.0ghz 800mhz FSB Motherboard: Gigabyte ga-8i915pl-g RAM: Kingston 1GB DDR 400mhz
When the pc boots it shows that the cpu works at only 1.5ghz (100mhz bus * 15) Its supposed to work at 200mhz bus (800mhz fsb). When i enter the BIOS i see that the bus is set to auto with a frequency of 200mhz. If i try to manually set it to 200mhz it still boots at 100mhz (sometimes 75/120/133 randomly).
I also noticed that if i try to set the memory timings it only allows me to use 2.5/3/4. 2.5 makes my ram work at 500mhz which it is not supposed to and that could be the problem. In the motherboard manual it says the for 533fsb i can set 2.5/3/4 and for 800fsb i can set 1.66/2/2.66 (which are not available).
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Try resetting the Cmos, then get into BIOS and load the optimized defaults.