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Low RAM R/W results

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Our only guess is that the memory controller (IMC) falls into an unstable state with your 3733 MHz configuration, and that causes the IMC to fall back to a single-channel operation mode.  Even though it reports as if both channels were operating properly, the numbers indicate single-channel mode.

Another, although quite unlikely guess: there are certain "bumps" in the memory frequency curve where the IMC needs to insert additional wait cycles in order to stabilize itself.  That may cause an uneven increase of performance as you increase the memory frequency.  But when that happens, the "bumps" aren't that huge as in your particular case.

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