Technically, voltages over 1.5V are simply overclocked/overvolted to achieve the timings of the modules.
Intel's official stance was warranties were void if you used >1.575V (+5%, which can occur in spikes anyway) as you risk damage to the MC (memory controller) in sustained use. I'm not sure how much weight is behind the "warranty" argument with a CPU that's nearing 6 years old though.
In real-world use, I'm not aware of anybody damaging the MC from using OC/Over-volted RAM...... but it's a possibility.
I'd be more concerned if I were running an overclock on the CPU in addition to the memory but, as you have a locked CPU, that wont be the case.
Depending on the board you're pairing it with; you might not be able to run at that speed anyway.
FWIW, there should be other XMP profiles on the modules - like 1866 and 2133MHz - if you're worried, you could run one of those; I'm sure they're @ 1.5V.