well as an update to my earlier post that my 2nd set of Ballistix had died and Crucial provided single sided stuff which was even worse !!]

anyway .... got OCZ HPC Reaper instead now .. 2x2gb and that does 1035 MHz CAS5 - @ 1.9V, and 1140 @ 2.1V

nice not having to use high voltages anymore - so sticking at the 1.9V

life after Ballistix