Are programs like cpu-z reliable?

Cpu-z and Speccy are saying that my ram is running at 666.5MHz but I look at my bios and everything seems look ok, 13.33 multiplier, 1.5 volts, etc, so the bios say that the ram is running at 1333MHz. Are the programs failing for some reason? or my ram is really on low frequencies?
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  1. Best answer
    DDR = Double Data Rate.

    666.5 x 2 (double) = 1,333 MHz.

    Yes, outside of newly released tech (where updates are required to read accurately), CPU-Z, GPU-Z, Speccy, MSI AB etc are all fairly reliable.
  2. DDR memory, so 666.5 x 2 = 1333.
  3. The DD in DDR3 stands for double data rate. In cpu-z you see 666.5, but the actual speed is 2 times that. 666.5 x 2 = 1333MHz
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