The RAM won't be any issue, OP would just need to enable XMP Profile 1 from BIOS, more speed only adds frames in gaming. Higher voltage is FULLY supported by Intel, that is why they provide the XMP profile. Basically most 2133MHz or higher sticks don't run with lower wattage than 1.6V, so its not a complusion to go with 1.5V.
Also, higher speeds helps in OCing the CPU too.