According to a Twitter post from an iOS developer Hamza Sood, spotted by Wccftech.com, both the iPhone 6S and the iPhone 6S Plus come with 2GB of RAM while the iPad Pro gets 4GB of RAM. This means that Apple has decided to double the amount of RAM compared to iPhone 6 and iPhone 6 Plus.
Since Apple marketed the iPad Pro as the device that can edit three 4K video streams at the same time, the company needed to put as much RAM as possible, so iPad Pro ended up with 4GB of RAM.
In case you missed it earlier, both the iPhone 6S and the iPhone 6S Plus come with the same 4.7-inch and 5.5-inch displays as their predecessors. While the screen has not been updated, except that it has an improved strength of the glass and force sensing layer, Apple has used the new Apple A9 SoC on both smartphones. The iPad Pro got the shiny new Apple A9X SoC and a 12.9-inch 2732x2048 display.
Both smartphones are already up for pre-order all around the world and will be available in retail stores on September 25th at least in certain regions.