Good question. In 2013 they hit 0.5 pflops (0.5*10^15) by putting together 26,496 cores in one of their data centers. So I expect they have scaled proportionally and would be around 1-1.5 pflops. That would put them at #50-80 on top500.org. Bandwidth wise they are probably at 10-50 gigabit/s which is where 10G ethernet is and Infiniband FDR starts -- a lot of systems in that range use those technologies for communications (with custom and higher bandwidth options in the top 10).

Current Top500: http://top500.org/list/2015/11/

Amazon 2013: http://arstechnica.com/information-technology/2013/11/amazon...

EDIT: As far as a whole data center is concerned, i'm not sure it would be a direct comparison as bandwidth would not be as high between cabinets. Amazon using their off the shelf tech to make a supercomputer is probably a better indication of how they compare. Of course at 26,496 cores that may be a data center!