I've been interested in upgrading my OEM memory for quite some time now, but I read an article online that stated the operating voltage of memory must be within the maximum operating voltage specifications of your chipset. Through looking at my system specs, I was able to determine that my OEM memory operates at around 1.2V . However, I've been looking at high-performance RAM that runs at 1.35V . Can this voltage increase be potentially dangerous to my system?
Using memory that uses a higher bus frequency or a higher voltage than the processor has been validated to support is technically a form of overclocking. It is stressing the processor beyond its validated (and warranted) limits and a resulting failure could void your warranty.
@David94 Regarding undervolting your processor, you cannot do that. It is a security risk. As such, Intel has disabled it.