Nah, you're on the right track I would only worry about lowering the multi for the cores if you are hitting a hard frequency limit on the CPU and want a higher QPI. The main difference between faster and slower processors (in the same class) is the multi, so take it as high as you can. In the case of the memory you should be able to adjust the ratio/divider to increase its speed well beyond what it can handle so you should have enough headroom. Once you have an overclock that you're happy with then you could consider adjusting the multi if you want to go higher on the QPI, but honestly even the stock QPI should be well fast enough for all on-die components. Perhaps it might show some benefit in a multi-socketed CPU setup (depending on application).
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