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Could you please tell me why you need such options in BIOS？
To have a stable running board for once and for all.

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Is there something wrong with your settings for the PC at present?
Running 4 X 2GB at DDR +1066MHz is almost impossible. A few degrees higher temperature and the board starts randomly failing. A MCH Read Delay of 8T is to tight for Quads in almost every situation.

And most important of all Intel only suggested to use these timings as default but I don't think that they've said that you can't relax them to improve stability.