HDTune tests a similar level of features as compared with HDTach, but with a different access pattern. Thus provides us with an additional set of benchmark numbers to compare between storage configurations. Here we can get the minimum, maximum and average transfer rates as well as the burst rates and access times. CPU utilization has proven negligible with modern processing horsepower, and is no longer included.
HDTune's burst test gives inconsistent results as its test method was meant for HDD caches.
Impressive figures from the RevoDrive 350 here. That raw throughput is made possible as the new card communicates at PCIe 2.0 x8, where the prior generation was only on a x4 link.