It says they have 850 servers, so 1700TB RAM (if they're all like this). If it's a big Hadoop cluster or similar, there's potentially huge performance gains by

It says they have 850 servers, so 1700TB RAM (if they're all like this). If it's a big Hadoop cluster or similar, there's potentially huge performance gains by keeping data in-RAM during processing. They have many petabytes of data, so I doubt the type of processing they are doing today would have been possible when they first started.