Q: Why I cannot get any speed from Thunderbolt 2

I just got ThunderBay 4 from OWC and installed one OCZ TRION 100 480 GB SSD in it. I connected it to iMac 27 Retina.

I do not want to use RAID functionality, I just want to conect bunch of SSDs via fast link to my iMac.

Here are specs:

• Thunderbolt 2 speed is up to 20 GB/s
• OCZ TRION 100 480 GB SSD read/write speed is 500+ MB/s

I expect to see performance around 500 MB/s because slowest component is SSD, but when I run benchmarks I see about 125 MB/s write and 320 MB/s read speed.

Does anybody have an idea why ThunderBay 4 has such poor performance?

p.s. I contacted support, but they are useless - all they suggested is to buy SoftRAID software for another $175...

p.s.s. Moreover, the box is very noisy. I cannot keep it on the desk.