I'm not sure what you're talking about. Do you mean the max default speed, or the maximum stable speed?
If we're talking maximum default, check out the sticks in your computer. They should have the #s listed right on a sticker on the ram. Otherwise use a program like CPU-Z and hit the SPD tab. That will tell you the factory speeds.
If you're looking for maximum stable, hit up this guide and scroll down until you see RAM OVERCLOCKING. That will illustrate how to find your ram's max stable speed.
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