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Motherboards  Piriform Speccy shows my RAM clock moving between
200MHz and 400MHz. Why is this. I thought there would be one
clock speed. My RAM is Type DDR2 Size 2048 MBytes Manufacturer
Kingston Max Bandwidth PC2-6400 (400 MHz)  More about : jedec
Best solution  a c 98 V Motherboard  You likely have your BIOS
DRAM settings on auto, which means that for power saving means,
the mobo will flucutate the RAM bus speed. If you want it to
stay at a constant 400, you should manually configure the BIOS.