Mixing RAM voltages

I’ve got two pairs of sticks (DDR3, 1600/PC3 12800 I think). All are 2Gb per or 4Gb for the pair. After buying, I noted one pair is 1.65V while the other is 1.5V.

Google has failed me. I get forum posts that range from “It’s not optimal, but it will run at the the lower voltage just like it does with speed” to “OMG! It will blow up your computer someday.”

I’m guessing it’s towards the former or somewhere in between, but: is this bad for my computer? Should I pick up another pair?