If nubsauce is right and its 1.65 V, I would get rid of it, such as selling to a friend or online, or throwing it in an AMD build. 1.65V put heavy strain on intel CPU's causing them to die much faster. It also instantly voids the warranty, although I'm not sure how Intel would find out if you used 1.65 V ram.
Don't change what the ram is operating at, look for the XMP profile in your bios and change it to that. Should be in one of your settings somewhere in the RAM area. Once you do that, your motherboard should automatically start running the Ram at the correct clocks.