Hi Simple ,
Been real busy at work m8 , so only just seen this thread dude.
The Voltage is very important , but so are the timings.
My problem was when building up this system with the new motherboard I could only run 2GB ram , of my 8GB. I changed the Voltage to 2.10 and my system crashed.
It was the timings that allowed me to get my system up and running with the 8GB ram , and then the Voltage was upped to 2.10 at the correct settings to get me a 5.9 score.
If you are sure your memory is recommended to run @ a 4-4-4-12 setting by the ram makers , then you should set it at that setting I think.
Then run the system at normal Volts and do a test in Vista. ! !
If its still not satisfactory then if your sure your ram is 2+V compatible then up it to your desired Voltage.
The ram i use is meant to be run @ 2.10 with 4-4-5-18 timings. It was running 6-6-6-18 @1.8V default.
If you are not sure and have a slight worry return the Voltage to normal. You "could" damage the ram if its being run at high volts with the wrong timings.
I am sure you will figure out a 5.9 very soon.
McT