hi, I want to ask about HDMI. Does it support 2560 x1440_ (60 Hz)?

Also confirmed with 8gb additional ram, simple procedure.
Installed 8gb corsiar vengeance CL10 SODIMM DDR3 ram, made a big difference.
My windows experience before on 4Gb was the same as this article, and afterward the 8Gb more the graphics went up to 5.4 (from 4.6) and the memory went up to 7.4 (from 5.9).

About RAM. YES it WORKS!. I installed a 8 GB module to the second empty sodimm slot and now I have 8+4=12 GB. GREAT!
go buy your self! He he!

I confirm that for the second hard drive. 1) order by sony service the adapter SKT SATA 22P LD3022J-S4QL L SATA  and 2) buy any 2,5 inches low profile 7mm ssd or hdd. It works fine. Hope I helped you. Greetings from Greece!

What about the 1080P 15" T series notebook?

whether the empty ram slot can be installed 8GB DDR3? on the sony website, it is written that the maximum ram is only 8gb?
sorry for my bad english.

The Sony information is wrong. I installed a second internal storage device (Western Digital Scorpio 7mm height 500 GB) with an L-Sata-Adapter (delivered by Sony Service) and it works after the second restart without any problem. Greetings from Switzerland.