The Xbox Scorpio has 12GB of GDDR5 RAM, which is 4GB more than the standard Xbox One. On the standard Xbox One, 5GB of that was available for games, and the remaining 3GB saved for the system itself. On the Scorpio, 8GB was reserved for games, and 4GB reserved for the system and OS. However, that has now changed.
According to a tweet from Mike Ybarra, Microsoft has now freed up an additional GB of memory for developers, meaning they can now use 9GB of GDDR5 memory- this is almost double the memory that is available on the PS4, Xbox One and One S, and it is more than the memory available to developers on the PS4 Pro as well. 9GB of usable memory is a lot- and it should remove any bottlenecks the developers might have run into (though, of course, the CPU being Jaguar remains a very real constraint, still).
This further adds to the Scorpio’s entire aura of being the most powerful console ever made- now let’s hope developers actually leverage all that hardware properly.