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
Max Bandwidth PC2-6400 (400 MHz)
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.