Bogus. The 1.5v limitation is for the JEDEC standard ... Intel XMP exceeds the JEDEC standard, so its officially called 'overclocking" even tho 99.9% of RAm sticks are advertised and rated for the XMP setting. Neither the RAM manufacturer, MoBo maker or Intel has any issue with DDR3 at 1.65v nor DDR4 at 1.50v. No matter how many times this false rumor is debunked, it still gets reposted on tech forums. Check the Official i5 / i7 compatibility lists here:
https://www.intel.com/content/www/us/en/gaming/extreme-memory-profile-xmp.html
I been running 1.7v on my Haswell build (DDR3-2400) for 3 years.