This is what I have found here: http://www.androidauthority.com/iphone-6s-6s-plus-release-specs-640994/
Quote"First off, Apple is finally moving away from its reliance on devices with 1GB RAM, with the iPhone 6S and 6S Plus both offering an Apple A9 chipset with 2GB RAM. The new chip claims to boast 70% faster CPU performance and 90% GPU performance over the Apple A8. For those into fingerprint scanners, Apple also promises double the speed with its 2nd-gen scanner."