e6750 is 1.35 at default 2,66ghz. Ive run it for a long time on 1.6v at 3.8 no problemo. As long as your cores are below 75C you should be fine. (these are bios settings, 1.6v would usually be 1.55v in OS under load cause of the bad droop).
With memory i guess its just trial and error. All hardware is different,- its all a big lottery. Just set up some decent setup and see how it fares in OCCT. If you crash within 30 minutes you need to either slack off settings or increase voltage and try again.
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