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The Intel® GL40 Express Chipset supports both clock speeds but it may depend on the following:
- For DDR3 the speed will be 667 MHz when the Front Side Bus is running at 667 MHz. http://www.intel.com/Assets/PDF/datasheet/320122.pdf (page 20).
- Memory sticks with different or mismatching specifications will usually run at the lower speed supported.
- It is possible that the clock speed needs to be manually set up in BIOS (by using XMP) in order to run at the higher clock speed (if this option is available or supported).