safe voltage for 2133 mhz on ram

[GhostPyro]

im trying to overclock my corsair vengeance pro 1866mhz 8gb 1.5v to 2133mhz at 1.6 volts. is 1.6 too high? also, the bios shows the value 1.60000 instead of 1.6 is this normal?

 

[n0ns3ns3]

I'm running my Vengeance 1866 @ 2400 using 1.6v
for 2133Mhz i used default 1.5v

 

[GhostPyro]

MERGED QUESTION
Question from GhostPyro : "ram overclocking 2133 mhz"

i want to overclock my ram to 2133 mhz but my ram came with 1.5 v. would it kill it if i ran it at 1.65v? i have the corsair vengeance pro 1833mhz 8gb ram