Can the estimated time of access times for distributed keyvalue stores be below 1ms?

I'm digging through various Redis/Ceph/Elliptics benchmark to determine, whenever its theoretically possible to reach (very optimistic) request completion time below milliseconds in a non-SSD non-million worth-of-SAS-disks environment.

It is known that for localhost installations, random read performance for Elliptics large dataset is around 3.5ms/item, and almost same time is officially given for Redis.

(Note: network latency is ignored for this question).

Is there a known K-V store with higher confirmed performance?