Ram speed, Motherboard FSB, and CPU FSB should be same? If any one is lower than the other will the PC underclock to the lowest FSB? Which tool can show me what is current resulatnt FSB of my computer?
Motherboard FSB and CPU FSB are the same. Memory speed is a little different. You can set it to run with the CPU or faster or slower. Running your memory slower the the CPU will cost performance. Running it faster than the CPU will not necessarily help.
CPUZ is good for monitoring CPU and memory speeds.