Almost a year ago, we wrote about another successful Nexus hardware upgrade: swapping the internal 32GB storage chip of a Nexus 5 with a 64GB unit. This was one way to circumvent running out of space with no microSD expansion slot. Today, another success story comes from XDA-Developers (where else can you hear about this stuff?) where XDA Member Cathair2906 successfully upgraded his RAM while getting a necessary CPU replacement. A Nexus 5X with 4GB of RAM is born. Here are screenshots of the memory screen in the phone's settings. Cathair2096 was also able to perform an OTA update to the...
Source: http://www.gsmarena.com/someone_upgraded_the_ram_on_their_nexus_5x_to_4gb-news-24534.php