Im having almost the same issue with my P55A-UD4P. Cant post anything over 1600Mhz (well tried 1640, but still). Tried with two sets of ram, and I know my ECOs shouldnt have any trouble up to 1900Mhz. Ive loosened down to 9-9-9-24 with extra vdimm and nothing. 1600 cas 7 is stable as can be with 1.4vdimm though.
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New Sig To Come
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