Now......
I've been sitting at 3.8GHz with HT on for a few weeks, 1.42 vcore and 1.65 vdimm, all else 'auto' and everything OK.
Decided to turn HT off today, as its a 'heat' hog, and not much benefit, if any, anyway.
Upped BCLK to 211 @ 19 Multi (4005GHz) and tested with same voltages as above, and all passed LinX etc no problems. Decided to reduce vcore a little, so took it down to 1.40v, and all passed no problems...BUT!
2Gb RAM disappeared just like that, 4Gb instead of 6Gb? BIOS and OS.
Dropped vdimm to 1.64v, and presto......I have my 6Gb back?, not tested for stability as yet.
Any thoughts guys?

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