HD Tach 3.0.1 Performance
The three HD Tach metrics that we sampled for each drive setup are Random Access, which is largely dependent on spindle speed of the drive, Read Average, and Burst Read throughput. Again, Read Average scores are what we would consider the most meaningful to the end user, whereas Burst Read is typically tied into the drives on-board cache and SATA interface speed.
If the results in HDTach 3 look somewhat familiar, it's possibly because they look very close to the SANDRA Read Performance scores. The main difference would be the random access score, as it is reported in time rather than bandwidth. As such, the numbers are particularly low, and in the case of the i-RAM it's a big fat zero. When it comes to access speed, the i-RAM truly is king. The Burst and Average Read performance for the i-RAM are up close to the limit of the SATA interface, both of the scores coming into the 130+ MB/s range. The RAID 0 setup is roughly 25% slower when it comes to the average read score, but moves up well past the i-RAM in burst speed, partly because of the large amount of cache, but also since it is unhindered by SATA I limitations.