Precision T7810 Memory Config

Hello,

I have a Precision T7810, and I am looking to upgrade the RAM. Is it possible to use 32GB (2x16GB) DDR4-2666MHz PC4-21300, or must it really be 4x8GB? I cant seem to find an answer if using 2 channels over the 4 will work. I understand it may not be recommended, but I want to know if it will or wont POST. The answer will drive my buying decisions. I am looking just for 32 or 64 GB kits, if that helps. Thanks!