https://www.gigabyte.com/us/Motherboard/GA-Z68X-UD3H-B3-rev-10/sp#spIf I may a couple of follow up questions:
My board has the following in use\available
Sata2_2 - available
Sata2_3 - HDD WD 2.0 TB
Sata2_4 - available
Sata3_0 - available
Sata3_1 - available
Sata3_5 - available
Sata3_6 - DVD
I don't see a Sata2_1 or Sata3_2, Sata3_3 or Sata3_4 on the board nor in the manual.
The SSD option your mentioned "SATA III 2.5" format SSD" would go in which?