Update: iFixit has confirmed that the 10.5-inch iPad Pro features 4GB of RAM.
The 10.5-inch iPad Pro is powered by 4GB of RAM, according to some reports. However, Apple doesn't specifically list the amount of RAM in their iOS products so nothing has been officially confirmed. We will have to wait until iFixit performs a tear down of the 10.5-inch model to be sure. We do know that the 10.5-inch iPad Pro is equipped with a A10X chip which Apple claims "offers far more power than most PC laptops."