I'm using Precision 5510 and I have noticed something strange. Not only Thunderbolt firmware upgrade application is no longer available on drivers download page for Precision 5510, the latest firmware released for Thunderbolt corresponds to NVM16, whereas for 5520 it is NVM21. If I'm correct, both use same controller, albeit different generation of chipsets and processors.  

Honestly, Thunderbolt on 5510 has been a rather disappointing affair, crippled bandwidth and lack of updates. I plan to use it for running external GPU for my CUDA requirements, but as of now it seems to be not possible (natively atleast). Is there any update in line or Precision 5510 is already EOL ?