planetcassandra.org/nosql-performance-benchmarks

For a look at the details behind this analysis as well as a complete write up of the benchmark configurations used, the white paper Solving Big Data Challenges for Enterprise Application Performance Management provides all of the insight from this test. Overall their results identified Apache Cassandra the “clear winner throughout our experiments”.

A summary of throughput and latency results are available here.

Even on Aerospike benchmarks, Cassandra outperforms MongoDB

http://www.aerospike.com/benchmark/