Al is absolutely correct. Operation at any speeds above the rated limit(s) is not validated nor guaranteed by Intel. It is possible that faster speeds could work, but many other factors come into play - motherboard circuit and component quality, DIMM quality, etc. Further, while it might work initially, it may not over time. As the processor, motherboard and DIMMs age, they naturally produce more noise and the overall noise can eventually reach levels where the data cannot be distinguished from the noise. Bottom line, I would stick with DIMMs that do not go above the rated speed for your processor.