1.65v @ 1600MHz? That's some power hungry RAM...
maaaah.. depends on the timings..
if its 6-6-6-9 timings... id call that pretty OP without the requirement of 1.7v.
I run my 1600MHz RAM @ 1.65v also. That is what it is specced at. Is that unsafe with a 3570K?
per intels' original spec, it was no greater then .5 vcore offset.
So if ur vcore is running 1.2 + .5 ~ no greater then 1.7 or you would risk damaging the memory controller.
However i dont think this applies to IB and Haswell.
Also some had problems booting up because ram required 1.67v, and default is 1.55
What one would need to do is load up 1.55 vcore ram... adjust voltage in bios, and then swap it out to get them to work.