Got my single sided (HNL) 2x1GiB set of PC6400 Ballistix to DDR2-1142, 5-5-5-18 with ~2.2v. I needed pretty loose sub-timings though. They were stable, while they lasted.
They died after four days.
...rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual. -- Thomas Jefferson