DDR3 RAM specification for MSI Z77A-GD65

Hello MSIers ,

I am about to buy the MSI Z77A-GD65 or GD55 not sure yet ... I used Gigabyte boards for 10 years and they always state to use 1.5 volt RAM sticks ...

Now for MSI and the mention board , what voltage should I pick ? I want 2 sticks of 4GB...