Honorable Mention: ION SpeedServer SR-71mach 4
Since ION Computer Systems in 2011 developed the first machine in its class to sustain a million transactions per second, engineers at the Long Island-based white-box builder have been hard at work to improve their winning design. The result was the Speed Server SR-71mach 4, an all-SSD 2U RAID server that delivers sustained IO performance on par with multiserver spinning arrays encompassing thousands of disks. And it does so with half-millisecond latency, about a quarter of what's typical of spinning-disk arrays. Under the hood is an Intel Grizzly Pass two-socket motherboard with a pair of Intel Xeon E5-2690 v2 10-core 3.0GHz processors running Windows Server 2012 R2 with 64 GB of 1,866MHz ECC RAM. A well-equipped mach4 costs around $47,000.