safe geil vdimm?

[tiber]

am currently clocking my ds4.ive got my geil pc6400 running at 2.25v.this seems to be helping things.is this safe voltage,could it even go a little higher?

 

[tiber]

thanx
am running a [email protected] ghz
memory volts was deffo holding me back before.as soon as i pushed it to 2.25v it started to go behond 300 fsb(im using a gigabyte ds4)
current mem timings are a bit loose-running at 5-5-5-15.could i tighten these abit?